Magnetic head and magnetic recorder

Abstract

To provide a magnetic head and a magnetic recorder that can obtain stable characteristics.SOLUTION: According to an embodiment, a magnetic head includes a reproduction unit including a medium facing surface. The reproduction unit includes first to fourth shields, and first to third terminals. A first magnetic member is provided between the first shield and the second shield and between the third shield and the fourth shield. The third shield includes a first side including a first end and a first other end. The fourth shield includes a second side including a second end and a second other end. The first side and the second side are inclined.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] FIELD An embodiment of the present invention relates to a magnetic head and a magnetic recording device. [Background technology]

[0002] A magnetic head including a magnetic sensor is used to reproduce information recorded on a magnetic recording medium such as an HDD (Hard Disk Drive), and stable characteristics are desired for the magnetic head. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] U.S. Patent No. 7,576,948 Summary of the Invention [Problem to be solved by the invention]

[0004] The embodiments of the present invention provide a magnetic head and a magnetic recording device that can obtain stable characteristics. [Means for solving the problem]

[0005] According to an embodiment, a magnetic head includes a reproducing section including a medium facing surface. The reproducing section includes a first shield, a second shield, a third shield, a fourth shield, a first magnetic member, a first terminal, a second terminal, and a third terminal. A direction from the first shield to the second shield is along a first direction along the medium facing surface. A second direction from the third shield to the fourth shield is along the medium facing surface and intersects the first direction. The first magnetic member is provided between the first shield and the second shield and between the third shield and the fourth shield. The first terminal is electrically connected to the third shield. The second terminal is electrically connected to the fourth shield. The third terminal is electrically connected to the first magnetic member. The third shield includes a first side including a first end and a first other end. The fourth shield includes a second side including a second end and a second other end. The position of the first end in a third direction intersecting the medium facing surface is between the position of the medium facing surface in the third direction and the position of the first other end in the third direction. The position of the second end in the third direction is between the position of the medium facing surface in the third direction and the position of the second other end in the third direction. The position of the first end in the second direction is between the position of the first other end in the second direction and the position of the second other end in the second direction. A first distance between the first end and the second end in the second direction is different from a second distance between the first other end and the second other end in the second direction. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a schematic view illustrating the magnetic head according to the first embodiment. [Figure 2] FIG. 2 is a schematic view illustrating the magnetic head according to the first embodiment. [Figure 3] FIG. 3 is a schematic view illustrating the magnetic head according to the first embodiment. [Figure 4] FIG. 4 is a schematic view illustrating the characteristics of the magnetic head according to the first embodiment. [Figure 5]FIG. 5 is a schematic view illustrating the magnetic head according to the first embodiment. [Figure 6] FIG. 6 is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment. [Figure 7] FIG. 7 is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment. [Figure 8] FIG. 8 is a schematic view illustrating the magnetic head according to the second embodiment. [Figure 9] FIG. 9 is a schematic view illustrating the magnetic head according to the second embodiment. [Figure 10] FIG. 10 is a schematic plan view illustrating a part of the magnetic head according to the second embodiment. [Figure 11] FIG. 11 is a schematic plan view illustrating the magnetic head according to the third embodiment. [Figure 12] FIG. 12 is a schematic perspective view illustrating the magnetic head according to the embodiment. [Figure 13] FIG. 13 is a schematic view illustrating the magnetic recording device according to the embodiment. [Figure 14] FIG. 14 is a schematic perspective view illustrating the magnetic head according to the embodiment. [Figure 15] FIG. 15 is a schematic perspective view illustrating a part of the magnetic recording device according to the embodiment. [Figure 16] FIG. 16 is a schematic perspective view illustrating the magnetic recording device according to the embodiment. [Figure 17] 17A and 17B are schematic perspective views illustrating a part of the magnetic recording device according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0007] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The drawings are schematic or conceptual, and the relationship between the thickness and width of each part, the size ratio between parts, etc. are not necessarily the same as those in reality. Even when the same part is shown, the dimensions and ratios may be different depending on the drawing. In this specification and in each drawing, elements similar to those previously described with reference to the previous drawings are designated by the same reference numerals, and detailed descriptions thereof will be omitted where appropriate.

[0008] (First embodiment) 1 to 3 are schematic views illustrating the magnetic head according to the first embodiment. Fig. 1 is a plan view, Fig. 2 is a cross-sectional view taken along line Y1-Y2 in Fig. 1, and Fig. 3 is a perspective view of a part of the magnetic head.

[0009] 1, a magnetic head 110 according to the embodiment includes a reproducing section 70. A magnetic recording device 210 according to the embodiment includes the magnetic head 110 and a magnetic recording medium 80 (see FIG. 2).

[0010] As shown in FIG. 2, the reproducing unit 70 includes a medium facing surface 10F. The medium facing surface 10F faces the magnetic recording medium 80. One direction along the medium facing surface 10F is defined as the X-axis direction. A direction along the medium facing surface 10F that is perpendicular to the X-axis direction is defined as the Y-axis direction. A direction perpendicular to the X-axis direction and the Y-axis direction is defined as the Z-axis direction. The medium facing surface 10F intersects with the Z-axis direction. The medium facing surface 10F may be, for example, one surface of a first magnetic member 11, which will be described later. FIG. 1 illustrates the reproducing unit 70 as viewed from the medium facing surface 10F.

[0011] The playback section 70 includes a first shield 41, a second shield 42, a third shield 43, a fourth shield 44, a first terminal 41T, a second terminal 42T, and a third terminal 43T.

[0012] The direction from the first shield 41 to the second shield 42 is along a first direction D1 that runs along the medium facing surface 10F. The first direction D1 is, for example, the X-axis direction.

[0013] A second direction D2 from the third shield 43 to the fourth shield 44 runs along the medium facing surface 10F and intersects with the first direction D1. The second direction D2 is, for example, the Y-axis direction.

[0014] The first magnetic member 11 is provided between the first shield 41 and the second shield 42 and between the third shield 43 and the fourth shield 44. The first terminal 41T is electrically connected to the third shield 43. The second terminal 42T is electrically connected to the fourth shield 44. The third terminal 43T is electrically connected to the first magnetic member 11.

[0015] The first shield 41 is, for example, one of a trailing shield and a leading shield. The second shield 42 is, for example, the other of a trailing shield and a leading shield. The third shield 43 and the fourth shield 44 are, for example, side shields.

[0016] The X-axis direction is, for example, the down-track direction, the Y-axis direction is, for example, the cross-track direction, and the Z-axis direction is, for example, the height direction.

[0017] As shown in FIGS. 2 and 3, the third shield 43 includes a first side s1. The fourth shield 44 includes a second side s2. The first side s1 and the second side s2 are inclined with respect to the Z-axis direction. The inclined sides of these shields control the magnetic properties of these shields. The first magnetic member 11 is provided between such shields. With this configuration, a signal corresponding to information recorded on the magnetic recording medium 80 is obtained from the reproducing unit 70. For example, the voltage (detection signal) between one of the first terminal 41T and the second terminal 42T and the third terminal 43T changes according to the information recorded on the magnetic recording medium 80.

[0018] For example, the magnetization of the first magnetic member 11 changes in accordance with the information (magnetization) recorded on the magnetic recording medium 80. The detection signal obtained from the reproducing unit 70 corresponds to the change in the magnetization of the first magnetic member 11. For example, the direction intersecting the medium facing surface 10F is defined as a third direction D3. The third direction D3 is, for example, the Z-axis direction. For example, the component of the magnetization of the first magnetic member 11 along the third direction D3 changes in accordance with the information (magnetization) recorded on the magnetic recording medium 80.

[0019] On the other hand, for example, a magnetic action occurs between the third shield 43 and the first magnetic member 11. For example, the angle between the magnetization of the portion of the third shield 43 facing the first magnetic member 11 and the magnetization of the first magnetic member 11 changes according to the information (magnetization) recorded on the magnetic recording medium 80.

[0020] For example, a magnetic interaction occurs between the fourth shield 44 and the first magnetic member 11. For example, the angle between the magnetization of the portion of the fourth shield 44 facing the first magnetic member 11 and the magnetization of the first magnetic member 11 changes according to the information (magnetization) recorded on the magnetic recording medium 80. The detection signal obtained from the reproducing unit 70 is based on this change in angle.

[0021] In the reproducing unit 70 of the reference example, a laminate including multiple stacked magnetic layers is provided between four shields. In this reference example, multiple non-magnetic layers are further provided between the multiple magnetic layers. Reproduction is performed by changing the angle between the magnetizations of the two magnetic layers depending on the information (magnetization) recorded on the magnetic recording medium 80. In the reference example, multiple magnetic layers are provided, and therefore each of the multiple magnetic layers is thin. As a result, the multiple magnetic layers are significantly affected by thermal fluctuation. Noise is significant. It is difficult to achieve stable reproduction operation.

[0022] In contrast, in the embodiment, the first magnetic member 11 (magnetic layer) is provided between the four shields. The thickness of the first magnetic member 11 can be made thicker compared to the reference example. This suppresses the effects of thermal fluctuation. Noise is reduced. Stable reproduction operation becomes easier to achieve. According to the embodiment, a magnetic head that can obtain stable characteristics can be provided.

[0023] For example, a signal based on the magnetic interaction between the third shield 43 and the first magnetic member 11 is used for reproduction. Alternatively, a signal based on the magnetic interaction between the fourth shield 44 and the first magnetic member 11 is used for reproduction.

[0024] 2 and 3, the first side s1 of the third shield 43 includes a first end p1 and a first other end pa1. The second side s2 of the fourth shield 44 includes a second end p2 and a second other end pa2.

[0025] 2, the position of the first end p1 in the third direction D3 is between the position of the medium facing surface 10F in the third direction D3 and the position of the first other end pa1 in the third direction D3. The position of the second end p2 in the third direction D3 is between the position of the medium facing surface 10F in the third direction D3 and the position of the second other end pa2 in the third direction D3.

[0026] A first distance d1 along the second direction between the first end p1 and the second end p2 is different from a second distance d2 along the second direction D2 between the first other end pa1 and the second other end pa2.

[0027] In this example, the first distance d1 is shorter than the second distance d2. The position of the first end p1 in the second direction D2 is between the position of the first other end pa1 in the second direction D2 and the position of the second other end pa2 in the second direction D2. The position of the second end p2 in the second direction D2 is between the position of the first end p1 in the second direction D2 and the position of the second other end pa2 in the second direction D2. The position of the first magnetic member 11 in the second direction D2 is between the position of the first end p1 in the second direction D2 and the position of the second end p2 in the second direction D2. With this configuration, the first side s1 is inclined with respect to the third direction D3. The second side s2 is inclined with respect to the third direction D3.

[0028] As will be described later, the first distance d1 may be greater than the second distance d2.

[0029] 3, the third magnetization 43M of the third shield 43 includes a component along the second direction D2. The fourth magnetization 44M of the fourth shield 44 includes a component along the second direction D2. In this case, it was found that, because the first side s1 and the second side s2 are inclined with respect to the third direction D3, the magnetization in the regions of these shields facing the first magnetic member 11 has a component along the third direction D3.

[0030] The component along the second direction D2 may be a component in the same direction as the second direction D2 or a component in the opposite direction to the second direction D2.

[0031] FIG. 4 is a schematic view illustrating the characteristics of the magnetic head according to the first embodiment. 4 illustrates the simulation results of the third magnetization 43M of the third shield 43 and the fourth magnetization 44M of the fourth shield 44. The arrows in FIG. 4 indicate the directions of magnetization.

[0032] 4, the third magnetization 43M of the third shield 43 is generally aligned along the second direction D2 (or the opposite direction). In particular, near the medium facing surface 10F, the third magnetization 43M of the third shield 43 is substantially parallel to the second direction D2. The fourth magnetization 44M of the fourth shield 44 is generally aligned along the second direction D2 (or the opposite direction). In particular, near the medium facing surface 10F, the fourth magnetization 44M of the fourth shield 44 is substantially parallel to the second direction D2.

[0033] As shown in FIG. 4, the magnetization in a portion of the third shield 43 and a portion of the fourth shield 44 includes a component along the third direction D3. For example, the third shield 43 includes a first region r1. The first region r1 faces the first magnetic member 11. The fourth shield 44 includes a second region r2. The second region r2 faces the first magnetic member 11. The first region magnetization r1M of the first region r1 includes a component along the third direction D3. The second region magnetization r2M of the second region r2 includes a component along the fourth direction D4, which is opposite to the third direction D3.

[0034] For example, the magnetization at the inclined first side s1 and second side s2 includes a component along the third direction D3 or the fourth direction D4. It is considered that the influence of the magnetization at these sides causes the magnetization at the first region r1 and second region r2 to include a component along the third direction D3 or the fourth direction D4.

[0035] A change in the angle between the first region magnetization r1M, which includes a component along the third direction D3, and the magnetization of the first magnetic member 11 changes the first electrical resistance between the third shield 43 and the first magnetic member 11. This is thought to be due to the magnetoresistance effect. A change in the angle between the second region magnetization r2M, which includes a component along the fourth direction D4, and the magnetization of the first magnetic member 11 changes the second electrical resistance between the fourth shield 44 and the first magnetic member 11. This is thought to be due to the magnetoresistance effect.

[0036] The component of the first region magnetization r1M along the third direction D3 and the component of the second region magnetization r2M along the third direction D3 are in opposite directions. Therefore, for example, when the magnetization direction of the first magnetic member 11 changes and the first electrical resistance increases, the second electrical resistance decreases. For example, when the first electrical resistance decreases, the second electrical resistance increases. By detecting such changes in electrical resistance, information recorded on the magnetic recording medium 80 can be reproduced with high sensitivity.

[0037] As shown in FIG. 2 , the angle between the first side s1 and the third direction D3 is defined as a first angle θ1. The angle between the second side s2 and the third direction D3 is defined as a second angle θ2. These angles may be defined as 0 degrees or greater and 90 degrees or less. In an embodiment, the first angle θ1 may be 5 degrees or greater and 85 degrees or less. The second angle θ2 may be 5 degrees or greater and 85 degrees or less. The first angle θ1 may be 10 degrees or greater and 80 degrees or less. The second angle θ2 may be 10 degrees or greater and 80 degrees or less. Due to these angles, the first side s1 and the second side s2 are inclined with respect to the third direction D3.

[0038] As shown in FIG. 2, the third shield 43 has a first end length L1 along a straight line that passes through the first end p1 and extends in the third direction D3. The third shield 43 has a first other end length La1 along a straight line that passes through the first other end pa1 and extends in the third direction D3. The first other end length La1 is 0.1 to 10 times the first end length L1. The fourth shield 44 has a second end length L2 along a straight line that passes through the second end p2 and extends in the third direction D3. The fourth shield 44 has a second other end length La2 along a straight line that passes through the second other end pa2 and extends in the third direction D3. The second other end length La2 is 0.1 to 1.0 times the second end length L2. Highly accurate detection signals can be stably obtained.

[0039] For example, the first end length L1 may be 3 nm or more and 50 nm or less. For example, the first other end length La1 may be 10 nm or more and 10 μm or less. For example, the second end length L2 may be 3 nm or more and 50 nm or less. For example, the second other end length La2 may be 10 nm or more and 10 μm or less. For example, the first distance d1 may be 10 nm or more and 10 μm or less. For example, the second distance d2 may be 20 nm or more and 10 μm or less.

[0040] In one example, the length W1 of the third shield 43 along the second direction D2 is 10 nm or more and 10 μm or less. In one example, the length W2 of the fourth shield 44 along the second direction D2 is 10 nm or more and 10 μm or less.

[0041] 1, the reproducing section 70 may further include a first non-magnetic layer 31 and a second non-magnetic layer 32. The first non-magnetic layer 31 is provided between the third shield 43 and the first magnetic member 11. The second non-magnetic layer 32 is provided between the first magnetic member 11 and the fourth shield 44.

[0042] At least one of the first non-magnetic layer 31 and the second non-magnetic layer 32 contains at least one selected from the group consisting of Cu, Al, Au, Ag, W, Ta, Si, AlO, and MgO. When these non-magnetic layers contain a conductive material, the shield and the first magnetic member 11 form a GMR element. When these non-magnetic layers contain an insulating material, the shield and the first magnetic member 11 form a TMR element.

[0043] In this example, the reproducing section 70 further includes a third non-magnetic layer 33. The third non-magnetic layer 33 is provided between the first magnetic member 11 and the second shield 42. The third non-magnetic layer 33 is electrically connected to the first magnetic member 11 and the second shield 42. In this case, the third terminal 43T may be electrically connected to the second shield 42. In one example, the third non-magnetic layer 33 includes at least one selected from the group consisting of Cu, Al, Au, and Ag. For example, a highly sensitive detection signal can be obtained.

[0044] As shown in FIG. 1, a magnetic recording device 210 according to the embodiment includes a magnetic head 110 according to the embodiment, a magnetic recording medium 80 (see FIG. 2) facing the magnetic head 110, a first circuit 51, and a second circuit 52. The first circuit 51 is configured to supply a current between a first terminal 41T and a second terminal 42T. The second circuit 52 is configured to detect the potential of the first magnetic member 11. For example, the second circuit 52 is configured to detect the voltage between one of the first terminal 41T and the second terminal 42T and the third terminal 43T. This voltage is configured to change depending on the magnetization state recorded on the magnetic recording medium 80. This voltage corresponds to the detection signal described above. According to the embodiment, a magnetic recording device capable of obtaining stable characteristics can be provided.

[0045] As shown in FIG. 1, at least a portion of the third shield 43 and at least a portion of the fourth shield 44 may be provided between the first shield 41 and the second shield 42.

[0046] FIG. 5 is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment. Fig. 5 illustrates the reproducing section 70 of a magnetic head 110a according to the embodiment. Fig. 5 is a cross-sectional view taken along line Y1-Y2 in Fig. 1. As shown in Fig. 5, the shapes of these shields in the magnetic head 110a are different from those in the magnetic head 110. Except for this, the configuration of the magnetic head 110a is the same as that of the magnetic head 110.

[0047] As shown in FIG. 5, in the magnetic head 110a, the first distance d1 along the second direction D2 between the first end p1 and the second end p2 is longer than the second distance d2 along the second direction D2 between the first other end pa1 and the second other end pa2. In the third shield 43, the magnetization includes a component along the fourth direction D4, which is opposite to the third direction D3. In the fourth shield 44, the magnetization includes a component along the third direction D3. For example, the influence of thermal fluctuation is suppressed. For example, noise is reduced. For example, stable reproduction operation is more easily achieved.

[0048] FIG. 6 is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment. FIG. 6 illustrates the reproducing section 70 of a magnetic head 110b according to the embodiment. FIG. 6 is a cross-sectional view corresponding to the Y1-Y2 line in FIG. 1. In FIG. 6, the third shield 43, the fourth shield 44, and the first magnetic member 11 are depicted, and other elements are omitted. As shown in FIG. 6, the shapes of these shields in the magnetic head 110b are different from the shapes of the shields in the magnetic head 110. Except for this, the configuration of the magnetic head 110b is the same as the configuration of the magnetic head 110.

[0049] In the magnetic head 110b, the third shield 43 further includes a third side s3 including a third end p3 and a third other end pa3, and the fourth shield 44 further includes a fourth side s4 including a fourth end p4 and a fourth other end pa4.

[0050] The position of the third end p3 in the third direction D3 is between the position of the medium facing surface 10F in the third direction D3 and the position of the third other end pa3 in the third direction D3. The position of the fourth end p4 in the third direction D3 is between the position of the medium facing surface 10F in the third direction D3 and the position of the fourth other end pa4 in the third direction D3. In this example, the medium facing surface 10F is one surface of the first magnetic member 11.

[0051] The third distance d3 between the third end p3 and the fourth end p4 is different from the fourth distance d4 between the third other end pa3 and the fourth other end pa4. In this example, the third distance d3 is shorter than the fourth distance d4 between the third other end pa3 and the fourth other end pa4. The third side s3 is inclined with respect to the third direction D3. The fourth side s4 is inclined with respect to the third direction D3.

[0052] In such third shield 43 and fourth shield 44, the magnetization of the first region r1 also includes a component along the third direction D3. The magnetization of the second region r2 also includes a component along the fourth direction D4, which is opposite to the third direction D3. These magnetization characteristics are based on the inclination of the third side s3 and the fourth side s4. In the magnetic head 110b, for example, the influence of thermal fluctuation is suppressed. For example, noise is reduced. For example, stable reproduction operation is more easily achieved.

[0053] For example, when the first distance d1 is shorter than the second distance d2 (see FIG. 2), the third distance d3 is shorter than the fourth distance d4.

[0054] In this example, the position of the third end p3 in the second direction D2 is between the position of the third other end pa3 in the second direction D2 and the position of the fourth other end pa4 in the second direction D2. The position of the fourth end p4 in the second direction D2 is between the position of the third end p3 in the second direction D2 and the position of the fourth other end pa4 in the second direction D2. The position of the first magnetic member 11 in the second direction D2 is between the position of the third end p3 in the second direction D2 and the position of the fourth end p4 in the second direction D2.

[0055] In the embodiment, the third side s3 may be regarded as the first side s1, and the fourth side s4 may be regarded as the second side s2.

[0056] FIG. 7 is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment. FIG. 7 illustrates the reproducing section 70 of a magnetic head 110c according to the embodiment. As shown in FIG. 7, in the magnetic head 110c, the first distance d1 is longer than the second distance d2, and the third distance d3 is longer than the fourth distance d4. Except for this, the configuration of the magnetic head 110c is the same as that of the magnetic head 110b. In the magnetic head 110c, the first side s1 and the second side s2 are also inclined with respect to the third direction D3. For example, the effects of thermal fluctuations are suppressed. For example, noise is reduced. For example, stable reproducing operation is more easily achieved.

[0057] In the embodiment, the first magnetic member 11 includes, for example, at least one selected from the group consisting of Fe and Co. At least one of the first shield 41, the second shield 42, the third shield 43, and the fourth shield 44 includes at least one selected from the group consisting of Fe, Co, and Ni. These shields may include a soft magnetic material.

[0058] (Second embodiment) 8 and 9 are schematic views illustrating the magnetic head according to the second embodiment. Fig. 8 is a plan view, and Fig. 9 is a perspective view of a part of the magnetic head.

[0059] As shown in Fig. 8, the magnetic head 111 according to the embodiment includes a reproducing section 70. The reproducing section 70 includes a medium facing surface 10F. Fig. 8 illustrates the reproducing section 70 as seen from the medium facing surface 10F.

[0060] The reproducing section 70 includes a first shield 41, a second shield 42, a third shield 43, a fourth shield 44, a first magnetic member 11, a first magnetic layer 21, a second magnetic layer 22, a first terminal 41T, a second terminal 42T, and a third terminal 43T.

[0061] The direction from the first shield 41 to the second shield 42 is along a first direction D1 that runs along the medium facing surface 10F. A second direction D2 from the third shield 43 to the fourth shield 44 runs along the medium facing surface 10F and intersects with the first direction D1. The first magnetic member 11 is provided between the first shield 41 and the second shield 42 and between the third shield 43 and the fourth shield 44.

[0062] The first terminal 41T is electrically connected to the third shield 43. The second terminal 42T is electrically connected to the fourth shield 44. The third terminal 43T is electrically connected to the first magnetic member 11. In this example, the third terminal 43T is electrically connected to the first magnetic member 11 via the second shield 42.

[0063] The first magnetic layer 21 is provided between one of the first shield 41 and the second shield 42 and the third shield 43. In this example, the first magnetic layer 21 is provided between the first shield 41 and the third shield 43. The second magnetic layer 22 is provided between the one of the first shield 41 and the second shield 42 and the fourth shield 44. In this example, the second magnetic layer 22 is provided between the first shield 41 and the fourth shield 44.

[0064] 9, the first magnetic layer magnetization 21M of the first magnetic layer 21 includes a component along a third direction D3 that intersects with the medium facing surface 10F. The second magnetic layer magnetization 22M of the second magnetic layer 22 includes a component along a fourth direction D4 that is opposite to the third direction D3.

[0065] Due to the first magnetic layer 21, the third magnetization 43M of the third shield 43 includes a component along the third direction D3. Due to the second magnetic layer 22, the fourth magnetization 44M of the fourth shield includes a component along the fourth direction D4 that is opposite to the third direction D3.

[0066] In such a magnetic head 111, a signal corresponding to the information recorded on the magnetic recording medium 80 is obtained from the reproducing unit 70. For example, the voltage (detection signal) between one of the first terminal 41T and the second terminal 42T and the third terminal 43T changes according to the information recorded on the magnetic recording medium 80. In the magnetic head 111, the thickness of the first magnetic member 11 can also be increased. This suppresses the effects of thermal fluctuation. Noise is reduced. Stable reproducing operation becomes easier to obtain. According to the embodiment, a magnetic head capable of obtaining stable characteristics can be provided.

[0067] In one example, the first magnetic layer 21 and the second magnetic layer 22 include at least one selected from the group consisting of Fe, Co, and Ni. The first magnetic layer 21 and the second magnetic layer 22 are, for example, ferromagnetic layers. In one example, the first magnetic layer 21 and the second magnetic layer 22 may include IrMn. The first magnetic layer 21 and the second magnetic layer 22 may be diamagnetic layers. The first magnetic layer 21 may be in contact with the third shield 43. The second magnetic layer 22 may be in contact with the fourth shield 44. For example, the first magnetic layer 21 including IrMn may be in contact with the third shield 43. The second magnetic layer 22 including IrMn may be in contact with the fourth shield 44.

[0068] 8, the reproducing section 70 may further include a first other magnetic layer 21a containing IrMn and a second other magnetic layer 22a containing IrMn. The first other magnetic layer 21a is provided between the first shield 41 and the third shield 43. The second other magnetic layer 22a is provided between the first shield 41 and the fourth shield 44.

[0069] In this example, the first other magnetic layer 21a is stacked in the first direction D1 with the first magnetic layer 21. The second other magnetic layer 22a is stacked in the first direction D1 with the second magnetic layer 22.

[0070] In this example, the first magnetic layer 21 is provided between the first other magnetic layer 21a and the third shield 43. The second magnetic layer 22 is provided between the second other magnetic layer 22a and the fourth shield 44. Stable first magnetic layer magnetization 21M and second magnetic layer magnetization 22M are obtained. The first other magnetic layer 21a and the second other magnetic layer 22a are provided as needed and may be omitted.

[0071] 8, the reproducing unit 70 may further include a third magnetic layer 23 and a fourth magnetic layer 24. The third magnetic layer 23 is provided between the other of the first shield 41 and the second shield 42 and the third shield 43. In this example, the third magnetic layer 23 is provided between the second shield 42 and the third shield 43. The fourth magnetic layer 24 is provided between the other of the first shield 41 and the second shield 42 and the fourth shield 44. In this example, the fourth magnetic layer 24 is provided between the second shield 42 and the fourth shield 44.

[0072] 9, the third magnetic layer magnetization 23M of the third magnetic layer 23 includes a component along the third direction D3. The fourth magnetic layer magnetization 24M of the fourth magnetic layer 24 includes a component along the fourth direction D4. A more stable third magnetization 43M of the third shield 43 is obtained. A more stable fourth magnetization 44M of the fourth shield 44 is obtained.

[0073] In one example, the third magnetic layer 23 and the fourth magnetic layer 24 include at least one selected from the group consisting of Fe, Co, and Ni. The third magnetic layer 23 and the fourth magnetic layer 24 are, for example, ferromagnetic layers. In one example, the third magnetic layer 23 and the fourth magnetic layer 24 may include IrMn. The third magnetic layer 23 and the fourth magnetic layer 24 may be diamagnetic layers. The third magnetic layer 23 may be in contact with the third shield 43. The fourth magnetic layer 24 may be in contact with the fourth shield 44. For example, the third magnetic layer 23 including IrMn may be in contact with the third shield 43. The fourth magnetic layer 24 including IrMn may be in contact with the fourth shield 44.

[0074] 8, the reproducing section 70 may further include a third other magnetic layer 23a containing IrMn and a fourth other magnetic layer 24a containing IrMn. The third other magnetic layer 23a is provided between the third shield 43 and the second shield 42. The fourth other magnetic layer 24a is provided between the fourth shield 44 and the second shield 42.

[0075] In this example, the third other magnetic layer 23a is stacked in the first direction D1 with the third magnetic layer 23. The fourth other magnetic layer 24a is stacked in the first direction D1 with the fourth magnetic layer 24.

[0076] In this example, the third magnetic layer 23 is provided between the third other magnetic layer 23a and the third shield 43. The fourth magnetic layer 24 is provided between the fourth other magnetic layer 24a and the fourth shield 44. Stable third magnetic layer magnetization 23M and fourth magnetic layer magnetization 24M are obtained. The third other magnetic layer 23a and the fourth other magnetic layer 24a are provided as needed, and may be omitted.

[0077] The first magnetic layer 21, the second magnetic layer 22, the third magnetic layer 23, and the fourth magnetic layer 24 are, for example, ferromagnetic layers. The first other magnetic layer 21a, the second other magnetic layer 22a, the third other magnetic layer 23a, and the fourth other magnetic layer 24a are diamagnetic layers.

[0078] 8, in the magnetic head 111, the reproducing section 70 may include a first non-magnetic layer 31 and a second non-magnetic layer 32. The first non-magnetic layer 31 is provided between the third shield 43 and the first magnetic member 11. The second non-magnetic layer 32 is provided between the first magnetic member 11 and the fourth shield 44. At least one of the first non-magnetic layer 31 and the second non-magnetic layer 32 includes at least one selected from the group consisting of Cu, Al, Au, Ag, W, Ta, Si, AlO, and MgO.

[0079] 8, in this example, the reproducing section 70 further includes a third non-magnetic layer 33. The third non-magnetic layer 33 is provided between the first magnetic member 11 and the second shield 42. The third non-magnetic layer 33 is, for example, electrically connected to the first magnetic member 11 and the second shield 42. The third terminal 43T is electrically connected to the second shield 42. For example, the third non-magnetic layer 33 includes at least one selected from the group consisting of Cu, Al, Au, and Ag.

[0080] The configuration related to the first embodiment may be applied to the magnetic head 111. For example, as shown in FIG. 8, a magnetic recording device 211 according to the embodiment includes the magnetic head 111 according to the embodiment, a magnetic recording medium 80 (see FIG. 2) facing the magnetic head 111, a first circuit 51, and a second circuit 52. The first circuit 51 is configured to supply a current between the first terminal 41T and the second terminal 42T. The second circuit 52 is configured to detect the potential of the first magnetic member 11. For example, the second circuit 52 is configured to detect the voltage between one of the first terminal 41T and the second terminal 42T and the third terminal 43T. This voltage is configured to change depending on the magnetization state recorded on the magnetic recording medium 80. According to the embodiment, a magnetic recording device capable of obtaining stable characteristics can be provided.

[0081] FIG. 10 is a schematic plan view illustrating a part of the magnetic head according to the second embodiment. 10, in the magnetic head 111a according to the embodiment, the reproducing section 70 includes a first magnetic layer 21, a first other magnetic layer 21a, a second magnetic layer 22, a second other magnetic layer 22a, a second opposing magnetic layer 22b, and a second intermediate non-magnetic layer 22n. Except for this, the configuration of the magnetic head 111a may be the same as that of the magnetic head 111.

[0082] For example, the magnetization of the first magnetic layer 21 and the first other magnetic layer 21a includes a component along the third direction D3. The third magnetization 43M of the third shield 43 includes a component along the third direction D3.

[0083] For example, the second magnetic layer 22 is provided between the second other magnetic layer 22a and the fourth shield 44. It is provided between the second opposing magnetic layer 22b and the fourth shield 44. The second opposing magnetic layer 22b is provided between the second other magnetic layer 22a and the fourth shield 44. The second intermediate nonmagnetic layer 22n is provided between the second opposing magnetic layer 22b and the second magnetic layer 22. For example, the second opposing magnetic layer 22b is antiferromagnetically coupled to the second other magnetic layer 22a.

[0084] For example, the magnetization of the second other magnetic layer 22a includes a component along the third direction D3. For example, the magnetization of the second opposing magnetic layer 22b includes a component along the third direction D3. For example, the magnetization of the second magnetic layer 22 includes a component along the fourth direction D4 opposite to the third direction D3. For example, the fourth magnetization 44M of the fourth shield 44 includes a component along the fourth direction D4 opposite to the third direction D3. With this configuration, the third shield 43 and the fourth shield 44 have magnetizations in opposite directions to each other.

[0085] For example, the second intermediate nonmagnetic layer 22n contains at least one selected from the group consisting of Cu, Ru, Ir, and Au. Stable antiferromagnetic coupling is easily achieved. For example, mutually opposite magnetizations can be obtained by a simple process.

[0086] The configuration of the first magnetic layer 21, the first other magnetic layer 21a, the second magnetic layer 22, the second other magnetic layer 22a, the second opposing magnetic layer 22b, and the second intermediate non-magnetic layer 22n described with respect to the magnetic head 111a may be applied to the third magnetic layer 23 and the fourth magnetic layer 24.

[0087] (Third embodiment) FIG. 11 is a schematic plan view illustrating the magnetic head according to the third embodiment. 11, the magnetic head 112 according to the embodiment includes a reproducing section 70. The reproducing section 70 includes a medium facing surface 10F. Fig. 11 illustrates the reproducing section 70 as seen from the medium facing surface 10F.

[0088] 11, in the magnetic head 112, the reproducing section 70 includes a first shield 41, a second shield 42, a third shield 43, a fourth shield 44, a first magnetic member 11, a first terminal 41T, a second terminal 42T, and a third terminal 43T. The direction from the first shield 41 to the second shield 42 is along a first direction D1 that runs along the medium facing surface 10F. A second direction D2 from the third shield 43 to the fourth shield 44 runs along the medium facing surface 10F and intersects with the first direction D1.

[0089] The first magnetic member 11 is provided between the first shield 41 and the second shield 42 and between the third shield 43 and the fourth shield 44. The first terminal 41T is electrically connected to the third shield 43. The second terminal 42T is electrically connected to the fourth shield 44. The third terminal 43T is electrically connected to the first magnetic member 11.

[0090] In the magnetic head 112, the third magnetization 43M of the third shield 43 includes a component in a third direction D3 that intersects with the medium facing surface 10F. The fourth magnetization 44M of the fourth shield 44 includes a component in a fourth direction D4 that is opposite to the third direction D3.

[0091] For example, the third shield 43 includes a first region r1. The first region r1 faces the first magnetic member 11. The fourth shield 44 includes a second region r2. The second region r2 faces the first magnetic member 11. The magnetization of the first region r1 includes a component along the third direction D3. The magnetization of the second region r2 includes a component along the fourth direction D4 that is opposite to the third direction D3.

[0092] In such a magnetic head 112, a signal corresponding to the information recorded on the magnetic recording medium 80 is obtained from the reproducing unit 70. For example, the voltage (detection signal) between one of the first terminal 41T and the second terminal 42T and the third terminal 43T changes according to the information recorded on the magnetic recording medium 80. In the magnetic head 112, the thickness of the first magnetic member 11 can also be increased. This suppresses the effects of thermal fluctuation. Noise is reduced. Stable reproducing operation becomes easier to obtain. According to the embodiment, a magnetic head capable of obtaining stable characteristics can be provided.

[0093] In the magnetic head 112, the reproducing section 70 includes a first non-magnetic layer 31 and a second non-magnetic layer 32. The first non-magnetic layer 31 is provided between the third shield 43 and the first magnetic member 11. The second non-magnetic layer 32 is provided between the first magnetic member 11 and the fourth shield 44. At least one of the first non-magnetic layer 31 and the second non-magnetic layer 32 includes at least one selected from the group consisting of Cu, Al, Au, Ag, W, Ta, Si, AlO, and MgO.

[0094] In this example, the reproducing section 70 further includes a third non-magnetic layer 33. The third non-magnetic layer 33 is provided between the first magnetic member 11 and the second shield 42. The third non-magnetic layer 33 is electrically connected to the first magnetic member 11 and the second shield 42. The third terminal 43T is electrically connected to the second shield 42. The third non-magnetic layer includes at least one selected from the group consisting of Cu, Al, Au, and Ag.

[0095] The configuration related to the first embodiment may be applied to the magnetic head 112. For example, as shown in FIG. 11 , a magnetic recording device 212 according to the embodiment includes the magnetic head 112 according to the embodiment, a magnetic recording medium 80 (see FIG. 2 ) facing the magnetic head 112, a first circuit 51, and a second circuit 52. The first circuit 51 is configured to supply a current between the first terminal 41T and the second terminal 42T. The second circuit 52 is configured to detect the potential of the first magnetic member 11. For example, the second circuit 52 is configured to detect the voltage between one of the first terminal 41T and the second terminal 42T and the third terminal 43T. This voltage is configured to change depending on the magnetization state recorded on the magnetic recording medium 80. According to the embodiment, a magnetic recording device capable of obtaining stable characteristics can be provided.

[0096] FIG. 12 is a schematic perspective view illustrating the magnetic head according to the embodiment. 12 illustrates the third terminal 43T in the magnetic head 113 according to the embodiment. In the magnetic head 113, the third terminal 43T is connected to the first magnetic member 11 without a shield. The configuration of the magnetic head 113 may be applied to the magnetic heads according to the first to third embodiments.

[0097] FIG. 13 is a schematic view illustrating the magnetic recording device according to the embodiment. 13 illustrates an example of the configuration of the second circuit 52 in the magnetic recording device 213 according to the embodiment. The second circuit 52 includes a first differential circuit 52a and a second differential circuit 52b. The first differential circuit 52a includes a first input portion 52ap and a first other input portion 52an. The second differential circuit 52b includes a second input portion 52bp and a second other input portion 52bn.

[0098] For example, the first input section 52ap is the positive input of the first differential circuit 52a. For example, the first other input section 52an is the negative input of the first differential circuit 52a. For example, the second input section 52bp is the positive input of the second differential circuit 52b. For example, the second other input section 52bn is the negative input of the second differential circuit 52b.

[0099] The first input portion 52ap is electrically connected to the first terminal 41T. The first other input portion 52an is electrically connected to the third terminal 43T. The second input portion 52bp is electrically connected to the second terminal 42T. The second other input portion 52bn is electrically connected to the third terminal 43T.

[0100] 13, the first differential circuit 52a further includes a first output section 52ao. The second differential circuit 52b further includes a second output section 52bo. At least a portion of the signal (reproduced signal) from the reproducing section 70 is obtained from the first differential circuit 52a. At least a portion of the signal (reproduced signal) from the reproducing section 70 is obtained from the second differential circuit 52b.

[0101] For example, the voltage of the first output section 52ao and the voltage of the second output section 52bo change according to the information (magnetization) recorded on the magnetic recording medium 80. When the voltage of the first output section 52ao increases, the voltage of the second output section 52bo decreases. When the voltage of the first output section 52ao decreases, the voltage of the second output section 52bo increases.

[0102] The second circuit 52 may further include a third differential circuit 52c. The third differential circuit 52c includes a third input port 52cp and a third other input port 52cn. The third input port 52cp is, for example, the positive input of the third differential circuit 52c. The third other input port 52cn is, for example, the negative input of the third differential circuit 52c. The third input port 52cp is electrically connected to one of the first output port 52ao and the second output port 52bo. The third other input port 52cn is electrically connected to the other of the first output port 52ao and the second output port 52bo.

[0103] For example, the difference between the potential of the first output port 52ao and the potential of the second output port 52bo is output from the third output port 52co of the third differential circuit 52c. Differential processing can, for example, obtain a signal with higher strength. For example, a signal with reduced noise can be obtained. Generation can be performed with higher accuracy. The signal obtained from the third output port 52co can be supplied to a voltmeter 52d.

[0104] The configuration described regarding the magnetic recording device 213 may be applied to any magnetic recording device according to the embodiment.

[0105] An example of the configuration of the magnetic head and magnetic recording device according to the embodiment will be described below. In the following example, a magnetic head 110 is used as the magnetic head according to the embodiment.

[0106] FIG. 14 is a schematic perspective view illustrating the magnetic head according to the embodiment. 14, the magnetic head 110 according to the embodiment may further include a recording unit 90. The recording unit 90 of the magnetic head 110 records information on the magnetic recording medium 80. The reproducing unit 70 reproduces the information recorded on the magnetic recording medium 80.

[0107] The magnetic recording medium 80 includes, for example, a medium substrate 82 and a magnetic recording layer 81 provided on the medium substrate 82. The magnetization 83 of the magnetic recording layer 81 is controlled by a recording unit 90. The recording unit 90 includes, for example, a first magnetic pole 91 and a second magnetic pole 92. The first magnetic pole 91 is, for example, a main magnetic pole. The second magnetic pole 92 is, for example, a trailing shield. The recording unit 90 may include a recording element 93. The recording element 93 may include a magnetic field control element, a heating element, a high-frequency oscillation element, or the like. The recording element 93 may be omitted.

[0108] The reproducing section 70 includes, for example, a first shield 41, a second shield 42, and a first magnetic member 11. The first magnetic member 11 can output a signal according to the magnetization 83 of the magnetic recording layer 81. In FIG. 14, the third shield 43 and the fourth shield 44 are omitted.

[0109] 14, magnetic recording medium 80 moves relative to magnetic head 110 in medium movement direction 85. Information corresponding to magnetization 83 of magnetic recording layer 81 is controlled by magnetic head 110 at any position. Information corresponding to magnetization 83 of magnetic recording layer 81 is reproduced by magnetic head 110 at any position.

[0110] FIG. 15 is a schematic perspective view illustrating a part of the magnetic recording device according to the embodiment. FIG. 15 illustrates a head slider. The magnetic head 110 is provided on a head slider 159. The head slider 159 includes, for example, Al2O3 / TiC. The head slider 159 moves relative to the magnetic recording medium while floating above or in contact with the magnetic recording medium.

[0111] The head slider 159 has, for example, an air inflow side 159A and an air outflow side 159B. The magnetic head 110 is disposed on the side of the air outflow side 159B of the head slider 159. This allows the magnetic head 110 to move relative to the magnetic recording medium while floating above or in contact with the magnetic recording medium.

[0112] FIG. 16 is a schematic perspective view illustrating the magnetic recording device according to the embodiment. 17A and 17B are schematic perspective views illustrating a part of the magnetic recording device according to the embodiment. The magnetic recording device may be a magnetic recording and reproducing device. As shown in FIG. 16, a rotary actuator is used in a magnetic recording device 150 according to the embodiment. A recording medium disk 180 is mounted on a spindle motor 180M. The recording medium disk 180 is rotated in the direction of arrow AR by the spindle motor 180M. The spindle motor 180M responds to a control signal from a drive control unit. The magnetic recording device 150 according to the embodiment may include a plurality of recording medium disks 180. The magnetic recording device 150 may include a recording medium 181. The recording medium 181 is, for example, an SSD (Solid State Drive). The recording medium 181 may be, for example, a non-volatile memory such as a flash memory. For example, the magnetic recording device 150 may be a hybrid HDD (Hard Disk Drive).

[0113] The head slider 159 records and reproduces information to be recorded on the recording medium disk 180. The head slider 159 is provided at the tip of the thin-film suspension 154. Near the tip of the head slider 159, a magnetic head according to the embodiment is provided.

[0114] When the recording medium disk 180 rotates, the pressing pressure from the suspension 154 and the pressure generated at the air bearing surface (ABS) of the head slider 159 are balanced. The distance between the air bearing surface of the head slider 159 and the surface of the recording medium disk 180 is a predetermined flying height. In an embodiment, the head slider 159 may be in contact with the recording medium disk 180. For example, a contact traveling type may be applied.

[0115] The suspension 154 is connected to one end of an arm 155 (e.g., an actuator arm). The arm 155 has, for example, a bobbin portion. The bobbin portion holds a drive coil. A voice coil motor 156 is provided at the other end of the arm 155. The voice coil motor 156 is a type of linear motor. The voice coil motor 156 includes, for example, a drive coil and a magnetic circuit. The drive coil is wound around the bobbin portion of the arm 155. The magnetic circuit includes a permanent magnet and an opposing yoke. The drive coil is provided between the permanent magnet and the opposing yoke. The suspension 154 has one end and the other end. The magnetic head is provided at one end of the suspension 154. The arm 155 is connected to the other end of the suspension 154.

[0116] Arm 155 is held by ball bearings. The ball bearings are provided at two locations, above and below bearing portion 157. Arm 155 can rotate and slide using voice coil motor 156. The magnetic head can be moved to any position on recording medium disk 180.

[0117] FIG. 17(a) is an enlarged perspective view of a head stack assembly 160, illustrating the configuration of a portion of the magnetic recording device. FIG. 17B is a perspective view illustrating a magnetic head assembly (head gimbal assembly: HGA) 158 that is part of the head stack assembly 160. As shown in FIG.

[0118] 17(a), the head stack assembly 160 includes a bearing portion 157, a head gimbal assembly 158, and a support frame 161. The head gimbal assembly 158 extends from the bearing portion 157. The support frame 161 extends in the opposite direction to the extension direction of the head gimbal assembly 158. The support frame 161 supports a coil 162 of the voice coil motor 156.

[0119] As shown in FIG. 17( b ), the head gimbal assembly 158 has an arm 155 extending from a bearing portion 157 and a suspension 154 extending from the arm 155 .

[0120] A head slider 159 is provided at the tip of the suspension 154. The head slider 159 is provided with the magnetic head according to the embodiment.

[0121] A magnetic head assembly (head gimbal assembly) 158 according to the embodiment includes a magnetic head according to the embodiment, a head slider 159 provided with the magnetic head, a suspension 154, and an arm 155. The head slider 159 is provided at one end of the suspension 154. The arm 155 is connected to the other end of the suspension 154.

[0122] The suspension 154 has, for example, lead wires (not shown) for recording and reproducing signals. The suspension 154 may also have, for example, lead wires (not shown) for a heater for adjusting the flying height. The suspension 154 may also have lead wires (not shown) for an oscillation element, for example. These lead wires are electrically connected to a plurality of electrodes provided on the magnetic head.

[0123] The magnetic recording device 150 is provided with a signal processing unit 190. The signal processing unit 190 uses a magnetic head to record and reproduce signals on a magnetic recording medium. Input / output lines of the signal processing unit 190 are connected to, for example, electrode pads of the head gimbal assembly 158, and are electrically connected to the magnetic head.

[0124] The magnetic recording device 150 according to the embodiment includes a magnetic recording medium, a magnetic head according to the embodiment, a movable unit, a position control unit, and a signal processing unit. The movable unit enables the magnetic recording medium and the magnetic head to be moved relatively while being separated from each other or in contact with each other. The position control unit aligns the magnetic head with a predetermined recording position on the magnetic recording medium. The signal processing unit records and reproduces signals on the magnetic recording medium using the magnetic head.

[0125] For example, the magnetic recording medium is a recording medium disk 180. The movable part includes, for example, a head slider 159. The position control unit includes, for example, a head gimbal assembly 158.

[0126] The embodiments may include the following technical solutions. (Technical proposal 1) a reproducing section including a medium-facing surface; The playback unit A first shield; a second shield, the direction from the first shield to the second shield being along a first direction along the medium facing surface; The third shield, a fourth shield, wherein a second direction from the third shield to the fourth shield is along the medium facing surface and intersects with the first direction; a first magnetic member provided between the first shield and the second shield and between the third shield and the fourth shield; a first terminal electrically connected to the third shield; a second terminal electrically connected to the fourth shield; a third terminal electrically connected to the first magnetic member; Including, the third shield includes a first side including a first end and a first other end; the fourth shield includes a second side including a second end and a second other end; a position of the first end in a third direction intersecting the medium facing surface is between a position of the medium facing surface in the third direction and a position of the first other end in the third direction, a position of the second end in the third direction is between the position of the medium facing surface in the third direction and a position of the second other end in the third direction, a position of the first end in the second direction is between a position of the first other end in the second direction and a position of the second other end in the second direction; A magnetic head, wherein a first distance along the second direction between the first end and the second end is different from a second distance along the second direction between the first other end and the second other end.

[0127] (Technical proposal 2) a third magnetization of the third shield including a component along the second direction; A magnetic head as described in Technical Solution 1, wherein the fourth magnetization of the fourth shield includes the component along the second direction.

[0128] (Technical proposal 3) a first angle between the first side and the third direction is equal to or greater than 5 degrees and equal to or less than 85 degrees; The magnetic head according to Technical Solution 1 or 2, wherein a second angle between the second side and the third direction is greater than or equal to 5 degrees and less than or equal to 85 degrees.

[0129] (Technical proposal 4) the third shield further includes a third side including a third end and a third other end; the fourth shield further includes a fourth side including a fourth end and a fourth other end; a position of the third end in the third direction is between a position of the medium facing surface in the third direction and a position of the third other end in the third direction, a position of the fourth end in the third direction is between the position of the medium facing surface in the third direction and a position of the fourth other end in the third direction, The magnetic head according to any one of Technical Solutions 1 to 3, wherein a third distance between the third end and the fourth end is different from a fourth distance between the third other end and the fourth other end.

[0130] (Technical proposal 5) The playback unit a first nonmagnetic layer provided between the third shield and the first magnetic member; a second nonmagnetic layer provided between the first magnetic member and the fourth shield; The magnetic head according to any one of Technical Solutions 1 to 4, further comprising:

[0131] (Technical proposal 6) The magnetic head described in Technical Solution 5, wherein at least one of the first non-magnetic layer and the second non-magnetic layer contains at least one selected from the group consisting of Cu, Al, Au, Ag, W, Ta, Si, AlO, and MgO.

[0132] (Technical proposal 7) The playback unit further including a third non-magnetic layer provided between the first magnetic member and the second shield; the third nonmagnetic layer is electrically connected to the first magnetic member and the second shield; The magnetic head according to any one of Technical Solutions 1 to 6, wherein the third terminal is electrically connected to the second shield.

[0133] (Technical proposal 8) The magnetic head according to Technical Solution 7, wherein the third non-magnetic layer includes at least one selected from the group consisting of Cu, Al, Au, and Ag.

[0134] (Technical proposal 9) the third shield includes a first region facing the first magnetic member, the fourth shield includes a second region facing the first magnetic member, the first region magnetization of the first region includes a component along the third direction, The magnetic head according to any one of Technical Solutions 1 to 8, wherein the second region magnetization of the second region includes a component along a fourth direction opposite to the third direction.

[0135] (Technical proposal 10) a reproducing section including a medium-facing surface; The playback unit A first shield; a second shield, the direction from the first shield to the second shield being along a first direction along the medium facing surface; The third shield, a fourth shield, wherein a second direction from the third shield to the fourth shield is along the medium facing surface and intersects with the first direction; a first magnetic member provided between the first shield and the second shield and between the third shield and the fourth shield; a first magnetic layer provided between one of the first shield and the second shield and the third shield, the first magnetic layer having a first magnetic layer magnetization including a component along a third direction intersecting the medium facing surface; a second magnetic layer provided between the one of the first shield and the second shield and the fourth shield, the second magnetic layer having a second magnetic layer magnetization including a component along a fourth direction opposite to the third direction; a first terminal electrically connected to the third shield; a second terminal electrically connected to the fourth shield; a third terminal electrically connected to the first magnetic member; a magnetic head including:

[0136] (Technical proposal 11) The playback unit a first other magnetic layer containing IrMn; a second other magnetic layer containing IrMn; further comprising the first other magnetic layer is provided between the first shield and the third shield, The magnetic head described in Technical Solution 10, wherein the second other magnetic layer is provided between the first shield and the fourth shield.

[0137] (Technical proposal 12) the reproducing unit further includes a third magnetic layer and a fourth magnetic layer, the third magnetic layer is provided between the other of the first shield and the second shield and the third shield, the third magnetic layer magnetization of the third magnetic layer includes a component along the third direction, the fourth magnetic layer is provided between the other of the first shield and the second shield and the fourth shield, A magnetic head according to Technical Solution 10 or 11, wherein the fourth magnetic layer magnetization of the fourth magnetic layer includes a component along the fourth direction.

[0138] (Technical proposal 13) The playback unit a third magnetic layer containing IrMn; a fourth magnetic layer containing IrMn; further comprising the third other magnetic layer is provided between the third shield and the second shield, The magnetic head described in Technical Solution 12, wherein the fourth other magnetic layer is provided between the fourth shield and the second shield.

[0139] (Technical proposal 14) The playback unit a first nonmagnetic layer provided between the third shield and the first magnetic member; a second nonmagnetic layer provided between the first magnetic member and the fourth shield; further comprising The magnetic head according to any one of Technical Solutions 10 to 13, wherein at least one of the first non-magnetic layer and the second non-magnetic layer contains at least one selected from the group consisting of Cu, Al, Au, Ag, W, Ta, Si, AlO, and MgO.

[0140] (Technical proposal 15) the reproducing section further includes a third non-magnetic layer provided between the first magnetic member and the second shield, the third nonmagnetic layer is electrically connected to the first magnetic member and the second shield; the third terminal is electrically connected to the second shield; The magnetic head according to any one of Technical Solutions 10 to 14, wherein the third non-magnetic layer includes at least one selected from the group consisting of Cu, Al, Au, and Ag.

[0141] (Technical proposal 16) a reproducing section including a medium-facing surface; The playback unit A first shield; a second shield, the direction from the first shield to the second shield being along a first direction along the medium facing surface; The third shield, a fourth shield, wherein a second direction from the third shield to the fourth shield is along the medium facing surface and intersects with the first direction; a first magnetic member provided between the first shield and the second shield and between the third shield and the fourth shield; a first terminal electrically connected to the third shield; a second terminal electrically connected to the fourth shield; a third terminal electrically connected to the first magnetic member; Including, a third magnetization of the third shield includes a component in a third direction intersecting the medium facing surface, A magnetic head, wherein a fourth magnetization of the fourth shield includes a component in a fourth direction opposite to the third direction.

[0142] (Technical proposal 17) The playback unit a first nonmagnetic layer provided between the third shield and the first magnetic member; a second nonmagnetic layer provided between the first magnetic member and the fourth shield; further comprising at least one of the first non-magnetic layer and the second non-magnetic layer contains at least one selected from the group consisting of Cu, Al, Au, Ag, W, Ta, Si, AlO, and MgO; the reproducing section further includes a third non-magnetic layer provided between the first magnetic member and the second shield, the third nonmagnetic layer is electrically connected to the first magnetic member and the second shield; the third terminal is electrically connected to the second shield; The magnetic head according to Technical Solution 16, wherein the third non-magnetic layer includes at least one selected from the group consisting of Cu, Al, Au, and Ag.

[0143] (Technical proposal 18) A magnetic head according to any one of technical proposals 1 to 17; a magnetic recording medium facing the magnetic head; The first circuit, A second circuit; Equipped with the first circuit is configured to supply a current between the first terminal and the second terminal; the second circuit is configured to detect a voltage between one of the first terminal and the second terminal and the third terminal; A magnetic recording device configured such that the voltage changes depending on the magnetization state recorded on the magnetic recording medium.

[0144] (Technical proposal 19) The second circuit is a first differential circuit including a first input section and a first other input section; a second differential circuit including a second input section and a second other input section; Including, the first input unit is electrically connected to the first terminal, the first other input unit is electrically connected to the third terminal, the second input unit is electrically connected to the second terminal, The magnetic recording device according to Technical Solution 18, wherein the second other input unit is electrically connected to the third terminal.

[0145] (Technical proposal 20) the first differential circuit further includes a first output section; the second differential circuit further includes a second output section; the second circuit further includes a third differential circuit including a third input section and a third other input section; the third input unit is electrically connected to one of the first output unit and the second output unit; The magnetic recording device described in Technical Solution 19, wherein the third other input unit is electrically connected to the other of the first output unit and the second output unit.

[0146] According to the embodiment, it is possible to provide a magnetic head and a magnetic recording device that can obtain stable characteristics.

[0147] In this specification, "vertical" and "parallel" do not only mean strictly vertical and strictly parallel, but also include variations in the manufacturing process, and may mean substantially vertical and substantially parallel.

[0148] The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. For example, the specific configurations of the elements included in the magnetic head and magnetic recording device, such as the shield, magnetic member, and terminals, are within the scope of the present invention as long as a person skilled in the art can implement the present invention in a similar manner and obtain similar effects by appropriately selecting them from known ranges.

[0149] Any combination of two or more elements of each embodiment to the extent technically possible is also included within the scope of the present invention as long as it encompasses the gist of the present invention.

[0150] In addition, all magnetic heads and magnetic recording devices that can be implemented by a person skilled in the art by appropriately modifying the design based on the magnetic heads and magnetic recording devices described above as embodiments of the present invention also fall within the scope of the present invention, as long as they include the gist of the present invention.

[0151] In addition, within the scope of the concept of the present invention, a person skilled in the art may come up with various modifications and alterations, and it will be understood that these modifications and alterations also fall within the scope of the present invention.

[0152] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0153] 10F: medium facing surface, 11: first magnetic member, 21~24: first~fourth magnetic layer, 21M~24M: first~fourth magnetic layer magnetization, 21a~24a: first~fourth other magnetic layer, 22b: second opposing magnetic layer, 22n: second intermediate nonmagnetic layer, 31-33: 1st-3rd non-magnetic layer, 41-44: 1st-4th shield, 41T-43T: 1st-3rd terminal, 43M, 44M: 3rd, 4th magnetization, 51, 52: 1st, 2nd circuit, 52a, 52b, 52c: 1st-3rd differential circuit, 52an, 52bn, 52cn: 1st to 3rd other input section, 52ao, 52bo, 52co: 1st to 3rd output section, 52ap, 52bp, 52cp: first to third input sections, 52d: voltmeter, 70: reproduction section, 80: magnetic recording medium, 81: magnetic recording layer, 82: medium substrate, 83: magnetization, 85: medium movement direction, 90: recording section, 91, 92: first and second magnetic poles, 93: recording element, 110, 110a to 110c, 111, 111a, 112, 113: magnetic head, 150: magnetic recording device, 154: suspension, 155: arm, 156: voice coil motor, 157: bearing section, 158: head gimbal assembly, 159: head slider, 159A: air inlet side, 159B: air outlet side, 160: head stack assembly, 161: support frame, 162: coil 180: recording medium disk, 180M: spindle motor, 181: recording medium, 190: signal processing unit, 210-213: magnetic recording device, AR: arrow, D1-D4: first to fourth directions, L1, L2: first and second end lengths, La1, La2: first and second other end lengths, d1-d4: first to fourth distances, p1-p4: first to fourth ends, pa1-pa4: first to fourth other ends, r1, r2: first and second regions, r1M, r2M: first and second region magnetizations, s1-s4: first to fourth sides

Claims

1. a reproducing section including a medium-facing surface; The playback unit A first shield; a second shield, the direction from the first shield to the second shield being along a first direction along the medium facing surface; A third shield; and a fourth shield, wherein a second direction from the third shield to the fourth shield is along the medium facing surface and intersects with the first direction; a first magnetic member provided between the first shield and the second shield and between the third shield and the fourth shield; a first terminal electrically connected to the third shield; a second terminal electrically connected to the fourth shield; a third terminal electrically connected to the first magnetic member; Including, the third shield includes a first side including a first end and a first other end; the fourth shield includes a second side including a second end and a second other end; a position of the first end in a third direction intersecting the medium facing surface is between a position of the medium facing surface in the third direction and a position of the first other end in the third direction, a position of the second end in the third direction is between the position of the medium facing surface in the third direction and a position of the second other end in the third direction, a position of the first end in the second direction is between a position of the first other end in the second direction and a position of the second other end in the second direction, A magnetic head, wherein a first distance along the second direction between the first end and the second end is different from a second distance along the second direction between the first other end and the second other end.

2. a third magnetization of the third shield including a component along the second direction; The magnetic head of claim 1 , wherein the fourth magnetization of the fourth shield includes the component along the second direction.

3. the third shield further includes a third side including a third end and a third other end; the fourth shield further includes a fourth side including a fourth end and a fourth other end, a position of the third end in the third direction is between a position of the medium facing surface in the third direction and a position of the third other end in the third direction, a position of the fourth end in the third direction is between the position of the medium facing surface in the third direction and a position of the fourth other end in the third direction, 2. The magnetic head according to claim 1, wherein a third distance between the third end and the fourth end is different from a fourth distance between the third other end and the fourth other end.

4. The playback unit a first nonmagnetic layer provided between the third shield and the first magnetic member; a second nonmagnetic layer provided between the first magnetic member and the fourth shield; The magnetic head of claim 1 further comprising:

5. a reproducing section including a medium-facing surface; The playback unit A first shield; a second shield, the direction from the first shield to the second shield being along a first direction along the medium facing surface; A third shield; and a fourth shield, wherein a second direction from the third shield to the fourth shield is along the medium facing surface and intersects with the first direction; a first magnetic member provided between the first shield and the second shield and between the third shield and the fourth shield; a first magnetic layer provided between one of the first shield and the second shield and the third shield, the first magnetic layer having a first magnetic layer magnetization including a component along a third direction intersecting the medium facing surface; a second magnetic layer provided between the one of the first shield and the second shield and the fourth shield, the second magnetic layer having a second magnetic layer magnetization including a component along a fourth direction opposite to the third direction; a first terminal electrically connected to the third shield; a second terminal electrically connected to the fourth shield; a third terminal electrically connected to the first magnetic member; a magnetic head including:

6. The playback unit a first other magnetic layer containing IrMn; a second other magnetic layer containing IrMn; further comprising the first other magnetic layer is provided between the first shield and the third shield, The magnetic head according to claim 5 , wherein the second other magnetic layer is provided between the first shield and the fourth shield.

7. a reproducing section including a medium-facing surface; The playback unit A first shield; a second shield, the direction from the first shield to the second shield being along a first direction along the medium facing surface; A third shield; and a fourth shield, wherein a second direction from the third shield to the fourth shield is along the medium facing surface and intersects with the first direction; a first magnetic member provided between the first shield and the second shield and between the third shield and the fourth shield; a first terminal electrically connected to the third shield; a second terminal electrically connected to the fourth shield; a third terminal electrically connected to the first magnetic member; Including, a third magnetization of the third shield includes a component in a third direction intersecting the medium facing surface, A magnetic head, wherein a fourth magnetization of the fourth shield includes a component in a fourth direction opposite to the third direction.

8. A magnetic head according to any one of claims 1 to 7, a magnetic recording medium facing the magnetic head; A first circuit; A second circuit; Equipped with the first circuit is configured to supply a current between the first terminal and the second terminal; the second circuit is configured to detect a voltage between one of the first terminal and the second terminal and the third terminal; A magnetic recording device configured such that the voltage changes depending on the magnetization state recorded on the magnetic recording medium.

9. The second circuit is a first differential circuit including a first input section and a first other input section; a second differential circuit including a second input section and a second other input section; Including, the first input unit is electrically connected to the first terminal, the first other input unit is electrically connected to the third terminal, the second input unit is electrically connected to the second terminal, The magnetic recording device according to claim 8 , wherein the second other input section is electrically connected to the third terminal.

10. the first differential circuit further includes a first output section; the second differential circuit further includes a second output section; the second circuit further includes a third differential circuit including a third input section and a third other input section; the third input unit is electrically connected to one of the first output unit and the second output unit; The magnetic recording device according to claim 9 , wherein the third other input section is electrically connected to the other of the first output section and the second output section.

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