Magnetic head and magnetic recording device

Abstract

To improve characteristics of a magnetic head and a magnetic recording device.SOLUTION: In the magnetic heads 110 and, the first reproducing elements 70a of the reproducing part 70 include the first to fourth shields 41 to 44, the first magnetic member 11, and the first to fourth conductive members 61 to 64. The second direction D2 from the third shield 43 to the fourth shield 44 crosses the first direction D1 from the first shield 41 to the second shield 42. The first magnetic member 11 is provided between the first and second shields and between the third and fourth shields, the first magnetic member includes the first and second portions 11a and 11b, the third conductive member 63 is connected to the first portion 11a, and the fourth conductive member 64 is connected to the second portion 11b. The fourth conductive member includes a first conductive portion 64a, the third shield includes a first end portion 43F, the fourth shield includes a second end portion 44F, and a first distance d1 between the first end portion and the third conductive member is less than a second distance 44F between the second end portion d2 and the first conductive portion.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] 2. Description of the Related Art Information is recorded on a magnetic recording medium such as an HDD (Hard Disk Drive) by using a magnetic head including a magnetic sensor using a magnetic layer. Improvements in the characteristics of magnetic heads are desired. [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 improve characteristics. [Means for solving the problem]

[0005] According to an embodiment, the magnetic head includes a reproducing section including a first reproducing element. The first reproducing element includes a first shield, a second shield, a third shield, a fourth shield, a first magnetic member, a third conductive member, and a fourth conductive member. A second direction from the third shield to the fourth shield intersects with a first direction from the first shield to the second shield. 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 magnetic member includes a first portion and a second portion. The third conductive member is electrically connected to the first portion and is nonmagnetic. The fourth conductive member is electrically connected to the second portion and is nonmagnetic. The fourth conductive member includes a first conductive portion. A first position of the third conductive member in the second direction is between a position of the third shield in the second direction and a fourth shield position of the fourth shield in the second direction. A second position of the first conductive portion in the second direction is between the first position and the fourth shield position. The third shield includes a first end corresponding to the medium facing surface. The fourth shield includes a second end corresponding to the medium facing surface. A first distance in the third direction between the first end and the third conductive member is shorter than a second distance in the third direction between the second end and the first conductive portion. The third direction intersects a plane including the first direction and the second direction. [Brief explanation of the drawings]

[0006] [Figure 1] 1A and 1B are schematic views illustrating the magnetic head according to the first embodiment. [Figure 2] FIG. 2 is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment. [Figure 3] FIG. 3 is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment. [Figure 4] FIG. 4 is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment. [Figure 5] FIG. 5 is a schematic cross-sectional 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 cross-sectional view illustrating the magnetic head according to the first embodiment. [Figure 9] FIG. 9 is a schematic perspective view illustrating the magnetic head and the magnetic recording device according to the embodiment. [Figure 10] FIG. 10 is a schematic perspective view illustrating a part of the magnetic recording device according to the embodiment. [Figure 11] FIG. 11 is a schematic perspective view illustrating the magnetic recording device according to the embodiment. [Figure 12] 12A and 12B 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) 1A and 1B are schematic views illustrating the magnetic head according to the first embodiment. FIG. 2 is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment. Fig. 1(a) is a plan view, Fig. 1(b) is a cross-sectional view taken along line A3-A4 in Fig. 1(a), and Fig. 2 is a cross-sectional view taken along line A1-A2 in Fig. 1(a). 1, the magnetic head 110 according to the embodiment includes a reproducing section 70. The reproducing section 70 includes a first reproducing element 70a. The first reproducing element 70a includes a first shield 41, a second shield 42, a third shield 43, a fourth shield 44, a first magnetic member 11, a third conductive member 63, and a fourth conductive member 64. As will be described later, the first reproducing element 70a may include a first conductive member 61 and a second conductive member 62.

[0009] A second direction D2 from the third shield 43 to the fourth shield 44 intersects with the first direction D1 from the first shield 41 to the second shield 42.

[0010] In this example, the first direction D1 is the X-axis direction. One direction perpendicular to the X-axis direction is the Y-axis direction. The direction perpendicular to the X-axis and Y-axis directions is the Z-axis direction. The second direction D2 is, for example, the Y-axis direction.

[0011] The X-axis direction corresponds to, for example, the down-track direction, the Y-axis direction corresponds to, for example, the cross-track direction, and the Z-axis direction corresponds to, for example, the height direction.

[0012] 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. As shown in FIG. 1(b), the first magnetic member 11 includes a first portion 11a and a second portion 11b.

[0013] The third conductive member 63 is electrically connected to the first portion 11a. The third conductive member 63 is non-magnetic. The fourth conductive member 64 is electrically connected to the second portion 11b. The fourth conductive member 64 is non-magnetic.

[0014] The fourth conductive member 64 includes a first conductive portion 64a. A first position of the third conductive member 63 in the second direction D2 is between a position of the third shield 43 in the second direction D2 and a fourth shield position of the fourth shield 44 in the second direction D2. A second position of the first conductive portion 64a in the second direction D2 is between the first position and the fourth shield position.

[0015] As shown in Fig. 1(b), the first reproducing element 70a includes a medium facing surface 70F. The medium facing surface 70F faces a magnetic recording medium from which information is reproduced by the magnetic head 110. Fig. 1(a) corresponds to a plan view of the first reproducing element 70a, looking at the medium facing surface 70F. 1B, the third shield 43 includes a first end 43F corresponding to the medium facing surface 70F. The fourth shield 44 includes a second end 44F corresponding to the medium facing surface 70F. A first distance d1 in the third direction D3 between the first end 43F and the third conductive member 63 is shorter than a second distance d2 in the third direction D3 between the second end 44F and the first conductive portion 64a. The third direction D3 intersects with a plane including the first direction D1 and the second direction D2. The third direction D3 is, for example, the Z-axis direction.

[0016] The first distance d1 may be zero. The second distance d2 is longer than the first distance d1. The position of the first conductive portion 64a in the height direction is different from the position of the third conductive member 63 in the height direction.

[0017] As shown in FIG. 1( a), the first reproducing element 70a may further include a first conductive member 61 and a second conductive member 62. The first conductive member 61 is disposed between the first shield 41 and the first magnetic member 11 in the first direction D1. The second conductive member 62 is disposed between the first magnetic member 11 and the second shield 42 in the first direction D1. The first conductive member 61 and the second conductive member 62 are non-magnetic. For example, the first shield 41 may be electrically connected to a part of the first magnetic member 11 via the first conductive member 61. For example, the second shield 42 may be electrically connected to another part of the first magnetic member 11 via the second conductive member 62.

[0018] For example, the third conductive member 63 may be provided between the third shield 43 and the first magnetic member 11. The third conductive member 63 may be electrically connected to the third shield 43.

[0019] 1(a) and 1(b), in one example, the first reproducing element 70a includes a first terminal 51, a second terminal 52, a third terminal 53, and a fourth terminal 54. The first terminal 51 is electrically connected to the first shield 41. The second terminal 52 is electrically connected to the second shield 42. The third terminal 53 is electrically connected to the third shield 43. The fourth terminal 54 is electrically connected to the fourth conductive member 64.

[0020] For example, the voltage (electrical signal) between the third terminal 53 and the fourth terminal 54 is configured to change in accordance with the magnetic field to be detected when a current flows between the first terminal 51 and the second terminal 52. Such a change in the voltage (electrical signal) is thought to be caused by, for example, the anomalous Hall effect.

[0021] For example, a current is supplied by the first circuit 75a. A voltage (electrical signal) is detected by the second circuit 75b. This allows the detection of a magnetic field to be detected. The magnetic field to be detected is based on, for example, information recorded on a magnetic recording medium.

[0022] In the embodiment, the first circuit 75a and the second circuit 75b may be considered to be included in the magnetic head 110 for convenience. The first circuit 75a and the second circuit 75b may be provided separately from the magnetic head 110. These circuits may be included in the magnetic recording device. For example, the first circuit 75a includes a current source. The second circuit 75b includes a voltmeter, for example.

[0023] As described above, in the embodiment, the position of the first conductive portion 64a of the fourth conductive member 64 in the height direction is different from the position of the third conductive member 63 in the height direction. With this configuration, the direction connecting the third conductive member 63 and the first conductive portion 64a is inclined with respect to the XY plane. As a result, the voltage (electrical signal) generated between the third conductive member 63 and the first conductive portion 64a corresponds to the magnetization component of the first magnetic member 11 that intersects with the third direction D3. The voltage (electrical signal) may correspond to, for example, the magnetization component of the first magnetic member 11 that is inclined with respect to the third direction D3.

[0024] For example, the magnetic recording medium may be a perpendicular magnetic recording medium. The magnetic recording medium includes a first recording area and a second recording area. These recording areas are adjacent to each other in the cross-track direction (e.g., the second direction D2). When the magnetization direction of the first recording area is different from that of the second recording area, the magnetic fields emitted from these recording areas include a component in a direction intersecting the third direction D3 (e.g., a direction inclined with respect to the third direction D3). In the embodiment, the direction connecting the third conductive member 63 and the first conductive portion 64a is inclined with respect to the XY plane. Therefore, the signals obtained from these conductive members change with higher sensitivity according to the inclined components of the magnetic fields emitted from the two recording areas of the magnetic recording medium. In the embodiment, high-sensitivity detection is possible. This allows for higher recording density. According to the embodiment, a magnetic head with improved characteristics can be provided.

[0025] 1(b), in this example, the first conductive portion 64a does not overlap with the third conductive member 63 in the second direction D2. This allows for more effective detection of the tilted component of the magnetic field emitted from the magnetic recording medium.

[0026] As described above, the first magnetic member 11 has, for example, the anomalous Hall effect. For example, the first magnetic member 11 may include at least one selected from the group consisting of Co2MnGa, Co2MnAl, FePt, MnGa, Mn3Sn, Mn3Ge, Mn3Ga, RuO2, MnTe, CrSb, and Mn5Si3. These materials can effectively achieve, for example, the anomalous Hall effect. The first magnetic member 11 may include a Weyl ferromagnet. The first magnetic member 11 may include an L10 ordered alloy. The first magnetic member 11 may include a Weyl antiferromagnet. The first magnetic member 11 may include an alternating magnetic material.

[0027] In one example, at least one of the first conductive member 61, the second conductive member 62, the third conductive member 63, and the fourth conductive member 64 may include at least one selected from the group consisting of Cu, Au, Ag, Pt, Al, Pd, Ta, Ru, Hf, W, Mo, Ir, Cr, Tb, and Rh. These materials can, for example, suppress the influence of spin between the shield and the first magnetic member 11. High sensitivity can be easily obtained.

[0028] 1(a), in this example, in the first direction D1, the third shield 43 is located between a part of the first shield 41 and a part of the second shield 42. In the first direction D1, the fourth shield 44 is located between another part of the first shield 41 and another part of the second shield 42.

[0029] The first shield 41 is, for example, a leading shield. The second shield 42 is, for example, a trailing shield. The third shield 43 is at least a part of a side shield. The fourth shield 44 is at least a part of a side shield.

[0030] The first shield 41 is, for example, a bottom shield. The second shield 42 is, for example, a top shield. The third shield 43 is at least a part of a side bias layer. The fourth shield 44 is at least a part of a side bias layer.

[0031] 1(a), the first reproducing element 70a may further include a first insulating member 31. The first insulating member 31 includes a first insulating region 31a and a second insulating region 31b. At least a portion of the first insulating region 31a is provided between a portion of the first shield 41 and the third shield 43. At least a portion of the second insulating region 31b is provided between another portion of the first shield 41 and the fourth shield 44.

[0032] 1, the first insulating member 31 may further include a third insulating region 31c and a fourth insulating region 31d. At least a portion of the third insulating region 31c is provided between the third shield 43 and a portion of the second shield 42. At least a portion of the fourth insulating region 31d is provided between the fourth shield 44 and another portion of the second shield 42.

[0033] 1(b) and 2, the direction from the first magnetic member 11 to a portion of the first insulating member 31 may be along a third direction D3. The portion of the first insulating member 31 may be provided between the first shield 41 and the second shield 42. The portion of the first insulating member 31 may be provided between the third shield 43 and the fourth shield 44.

[0034] As shown in FIG. 1(b), the length of the first magnetic member 11 along the third direction D3 is defined as length L3. The length of the first magnetic member 11 along the second direction D2 is defined as length L2. For example, length L3 may be longer than length L2. For example, due to shape anisotropy, the component of the magnetization of the first magnetic member 11 along the third direction D3 becomes larger. This makes it easier to detect the magnetic field to be detected with higher sensitivity.

[0035] As shown in FIG. 2, the length of the first magnetic member 11 along the first direction D1 is defined as length L1. For example, length L3 may be longer than length L1. For example, due to shape anisotropy, the component of the magnetization of the first magnetic member 11 along the third direction D3 becomes larger. This makes it easier to detect the magnetic field to be detected with higher sensitivity. Length L2 may be longer than length L1.

[0036] FIG. 3 is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment. 3, in the magnetic head 111 according to the embodiment, the configuration of the fourth conductive member 64 is different from that in the magnetic head 110. Except for this, the configuration of the magnetic head 111 may be the same as the configuration of the magnetic head 110.

[0037] In the magnetic head 111, the fourth conductive member 64 contacts the first magnetic member 11 and the fourth shield 44. The fourth conductive member 64 is electrically connected to the first magnetic member 11 and the fourth shield 44. In this case, the fourth terminal 54 may be electrically connected to the fourth shield 44. In the magnetic head 111, too, the signal generated between the third conductive member 63 and the first conductive portion 64a changes with higher sensitivity in accordance with the tilted components of the magnetic fields emanating from the two recording regions of the magnetic recording medium. The tilted components of magnetization can be detected with high sensitivity. High-sensitivity detection is possible.

[0038] FIG. 4 is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment. 4, in the magnetic head 112 according to the embodiment, the configuration of the fourth conductive member 64 is different from that in the magnetic head 111. Except for this, the configuration of the magnetic head 112 may be the same as the configuration of the magnetic head 111.

[0039] In the magnetic head 112, the fourth conductive member 64 includes a second conductive portion 64b. The second conductive portion 64b is connected to the first conductive portion 64a. The second conductive portion 64b is provided between at least a portion of the first magnetic member 11 and at least a portion of the fourth shield 44 in the second direction D2. In the magnetic head 112, too, the signal generated between the third conductive member 63 and the fourth conductive member 64 changes with higher sensitivity in accordance with the tilted components of the magnetic fields emanating from the two recording regions of the magnetic recording medium. The tilted components of magnetization can be detected with high sensitivity. High-sensitivity detection is possible.

[0040] FIG. 5 is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment. 5, in the magnetic head 113 according to the embodiment, the third terminal 53 is electrically connected to the fourth shield 44. The configuration of the magnetic head 112 other than this may be the same as that of the magnetic head 110, for example.

[0041] The magnetic head 113 can further reduce noise. For example, it can detect with higher sensitivity the tilted components of the magnetic fields emitted from the two recording areas of the magnetic recording medium. For example, it can detect with higher accuracy the magnetization of the two recording areas in the cross-track direction.

[0042] In the magnetic head 113, the first reproducing element 70a may further include a fifth conductive member 65. The fifth conductive member 65 is provided between the first magnetic member 11 and the fourth shield 44 in the second direction D2. The fifth conductive member 65 is electrically connected to the first magnetic member 11 and the fourth shield 44. The first reproducing element 70a may further include a fifth terminal 55. The fifth terminal 55 is electrically connected to the fourth shield 44. In the magnetic head 113, the fifth terminal 55 is electrically connected to the third terminal 53.

[0043] FIG. 6 is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment. 6, in the magnetic head 114 according to the embodiment, the fifth terminal 55 is not connected to the third terminal 53. The configuration of the magnetic head 114 other than this may be the same as the configuration of the magnetic head 113, for example.

[0044] In the magnetic head 114, the first reproducing element 70a includes a fifth terminal 55 electrically connected to the fourth shield 44. In the magnetic head 114, a first signal V1 (voltage) between the third terminal 53 and the fifth terminal 55 is configured to change in accordance with the magnetic field to be detected when a current flows between the first terminal 51 and the second terminal 52 (see FIG. 1(a)). A second signal V2 (voltage) between the third terminal 53 and the fourth terminal 54 is configured to change in accordance with the magnetic field to be detected when a current flows between the first terminal 51 and the second terminal 52.

[0045] For example, the second signal V2 between the third terminal 53 and the fourth terminal 54 may be detected by the second circuit 75b. For example, the first signal V1 between the third terminal 53 and the fifth terminal 55 may be detected by the third circuit 75c. Information recorded on the magnetic recording medium can be reproduced based on the first signal V1 and the second signal V2. For example, the states of two recording areas adjacent in the cross-track direction can be detected by the first signal V1 and the second signal V2.

[0046] 6, for example, the first end 43F and the second end 44F face the magnetic recording medium 80. The magnetic recording medium 80 includes a first recording area 80a and a second recording area 80b. The direction from the first recording area 80a to the second recording area 80b is along the second direction D2. The magnetic field to be detected by the first reproducing element 70a depends on the state of the first recording area 80a and the state of the second recording area 80b.

[0047] For example, the first signal V1 corresponds to a first component of the magnetic field generated by the first magnetization of the first recording area 80a and the second magnetization of the second recording area 80b, the first component being along the third direction D3. The second signal V2 corresponds to a second component of the magnetic field generated by the first magnetization of the first recording area 80a and the second magnetization of the second recording area 80b, the second component being along the second direction D2. For example, the first signal V1 corresponds to a vertical component, and the second signal V2 corresponds to a horizontal component.

[0048] For example, when the direction of the component of the first magnetization in the first record area 80a along the third direction D3 is the same as the direction of the component of the second magnetization in the second record area 80b along the third direction D3, the first component along the third direction D3 is likely to occur. For example, when the direction of the component of the first magnetization in the first record area 80a along the third direction D3 is opposite to the direction of the component of the second magnetization in the second record area 80b along the third direction D3, the second component of the magnetic field along the second direction D2 is likely to occur.

[0049] FIG. 7 is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment. 7, in the magnetic head 115 according to the embodiment, the first reproducing element 70a includes a second magnetic member 12. The configuration of the magnetic head 115 other than this may be the same as that of the magnetic head 113, for example.

[0050] In the magnetic head 115, the first reproducing element 70a includes a second magnetic member 12 in addition to the first magnetic member 11. The direction from the first magnetic member 11 to the second magnetic member 12 is along the third direction D3. For example, the first conductive portion 64a is located between the first magnetic member 11 and the second magnetic member 12 in the third direction D3. The second magnetic member 12 includes, for example, IrMn. The second magnetic member 12 effectively controls the magnetization of the first magnetic member 11. For example, the component of the magnetization of the first magnetic member 11 along the third direction D3 can be increased.

[0051] In the magnetic heads 111 to 115, the first circuit 75a and the second circuit 75b can be interchanged. For example, the first circuit 75a may include a voltmeter, and the second circuit 75b may include a current source.

[0052] In the magnetic heads 111 to 115, a current may be supplied between the first terminal 51 and the second terminal 52, and a third signal V3 (e.g., a third voltage, see FIG. 1(a)) between the first terminal 51 and the second terminal 52 may vary depending on the magnetic field to be detected. Such a variation in the electric signal (voltage) may be attributed to, for example, at least one of anisotropic magnetoresistance and giant magnetoresistance. The first circuit 75a may further include a voltmeter. For example, the third signal V3 may correspond to a first component along the third direction D3 of the magnetic field generated by the first magnetization of the first recording region 80a and the second magnetization of the second recording region 80b.

[0053] FIG. 8 is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment. 8, in the magnetic head 116 according to the embodiment, the reproducing section 70 includes a second reproducing element 70b. The configuration of the magnetic head 116 other than this may be the same as that of the magnetic head 110, for example.

[0054] In the magnetic head 116, the reproducing section 70 includes a second reproducing element 70b in addition to the first reproducing element 70a. In this example, the direction from the second reproducing element 70b to the first reproducing element 70a is along the first direction D1.

[0055] The reproducing section 70 may be configured to perform a reproducing operation based on a first reproduced signal obtained from the first reproducing element 70a and a second reproduced signal obtained from the second reproducing element 70b.

[0056] For example, the first reproduction signal corresponds to a second component along the second direction D2 of the magnetic field generated by the first magnetization of the first record area 80a and the second magnetization of the second record area 80b. For example, the second reproduction signal corresponds to a first component along the third direction D3 of the magnetic field generated by the first magnetization of the first record area 80a and the second magnetization of the second record area 80b. The first reproduction signal corresponds to, for example, a horizontal component. The second reproduction signal corresponds to, for example, a vertical component.

[0057] As shown in FIG. 8, the second read element 70b may include a first magnetic layer 15a. The anomalous Hall effect may be used in the second read element 70b. The second read element 70b may include a second magnetic layer 15b. The direction from the first magnetic layer 15a to the second magnetic layer 15b is along the first direction D1. For example, the TMR effect may be used in the second read element 70b. For example, the GMR effect may be used. For example, the AMR effect (anisotropic magnetoresistance effect) may be used.

[0058] FIG. 9 is a schematic perspective view illustrating the magnetic head and the magnetic recording device according to the embodiment. As shown in FIG. 9 , a magnetic head (e.g., magnetic head 110) according to the embodiment includes a reproducing unit 70. The reproducing unit 70 includes a first reproducing element 70a. The reproducing unit 70 may further include other reproducing elements (e.g., a second reproducing element 70b, etc.). The magnetic head 110 is used together with a magnetic recording medium 80. The magnetic head 110 may 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.

[0059] 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 or a high-frequency oscillation element. The recording element 93 may be omitted.

[0060] The first reproducing element 70a of the reproducing unit 70 includes, for example, a first shield 41, a second shield 42, and a first magnetic member 11. The third shield 43 and the fourth shield 44 are omitted in Fig. 9. The reproducing unit 70 can output a signal according to the magnetization 83 of the magnetic recording layer 81.

[0061] 9, 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.

[0062] For example, the medium movement direction 85 is the direction from the first shield 41 to the second shield 42. For example, the magnetic recording medium 80 includes one recording area (first area). After the first area faces the first shield 41, the first area faces the second shield 42.

[0063] For example, the direction from the reproducing unit 70 to the recording unit 90 is along the first direction D1. For example, the second shield 42 is located between the first magnetic member 11 and the recording unit 90. For example, the second conductive member 62 is located between the first magnetic member 11 and the recording unit 90.

[0064] The recording section 90 may be configured to record data in the first recording area 80a and the second recording area 80b so that the timing of data switching is synchronized. In this example, the direction from the first recording area 80a to the second recording area 80b is along the second direction D2.

[0065] FIG. 10 is a schematic perspective view illustrating a part of the magnetic recording device according to the embodiment. FIG. 10 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.

[0066] 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.

[0067] FIG. 11 is a schematic perspective view illustrating the magnetic recording device according to the embodiment. 12A and 12B 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. 11, a rotary actuator is used in the magnetic recording device 150 according to the embodiment. The recording medium disk 180 is mounted on a spindle motor 180M. The recording medium disk 180 is rotated in the direction of the 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 also 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).

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] FIG. 12(a) is an enlarged perspective view of a head stack assembly 160, illustrating the configuration of a portion of the magnetic recording device. FIG. 12B 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.

[0073] 12(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.

[0074] As shown in FIG. 12( 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 .

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] The embodiments may include the following technical solutions. (Technical proposal 1) a reproducing unit including a first reproducing element; The first reproducing element is A first shield; A second shield; The third shield, a fourth shield, wherein a second direction from the third shield to the fourth shield intersects with a first direction from the first shield to the second shield; and a first magnetic member provided between the first shield and the second shield and between the third shield and the fourth shield, the first magnetic member including a first portion and a second portion; a non-magnetic third conductive member electrically connected to the first portion; a non-magnetic fourth conductive member electrically connected to the second portion; Including, the fourth conductive member includes a first conductive portion; a first position of the third conductive member in the second direction is between a position of the third shield in the second direction and a fourth shield position of the fourth shield in the second direction; a second position of the first conductive portion in the second direction is between the first position and the fourth shield position; the third shield includes a first end corresponding to the medium facing surface; the fourth shield includes a second end corresponding to the medium facing surface, a first distance in a third direction between the first end and the third conductive member is shorter than a second distance in the third direction between the second end and the first conductive portion; The magnetic head, wherein the third direction intersects with a plane including the first direction and the second direction.

[0082] (Technical proposal 2) In the first direction, the third shield is located between a portion of the first shield and a portion of the second shield, A magnetic head as described in Technical Solution 1, wherein in the first direction, the fourth shield is located between another part of the first shield and another part of the second shield.

[0083] (Technical proposal 3) The first reproducing element is a first terminal electrically connected to the first shield; a second terminal electrically connected to the second shield; a third terminal electrically connected to the third shield; a fourth terminal electrically connected to the fourth conductive member; The magnetic head according to Technical Solution 1 or 2, further comprising:

[0084] (Technical proposal 4) A magnetic head as described in Technical Proposal 3, wherein the voltage between the third terminal and the fourth terminal is configured to change in accordance with the magnetic field to be detected when a current flows between the first terminal and the second terminal.

[0085] (Technical proposal 5) The magnetic head according to Technical Solution 3 or 4, wherein the third terminal is further electrically connected to the fourth shield.

[0086] (Technical proposal 6) The first reproducing element is further comprising a fifth terminal electrically connected to the fourth shield; a first signal between the third terminal and the fifth terminal is configured to change in accordance with a magnetic field to be detected when a current flows between the first terminal and the second terminal; A magnetic head as described in Technical Solution 3, wherein the second signal between the third terminal and the fourth terminal is configured to change in accordance with the magnetic field to be detected when the current flows between the first terminal and the second terminal.

[0087] (Technical proposal 7) the first end and the second end face a magnetic recording medium, the magnetic recording medium includes a first recording area and a second recording area, a direction from the first recording area to the second recording area is along the second direction; The magnetic head according to Technical Solution 6, wherein the magnetic field to be detected depends on the state of the first recording area and the state of the second recording area.

[0088] (Technical proposal 8) the first signal is in response to a first component of the first magnetization of the first recording area along the third direction and a second component of the second magnetization of the second recording area along the third direction, The magnetic head according to Technical Solution 7, wherein the second signal corresponds to a component along the second direction based on the first magnetization and the second magnetization.

[0089] (Technical proposal 9) Further comprising a recording unit, The magnetic head described in Technical Solution 8, wherein the recording unit is configured to record data in the first recording area and the second recording area so that the timing of data switching is aligned.

[0090] (Technical proposal 10) the first reproducing element further includes a fifth conductive member; the fifth conductive member is provided between the first magnetic member and the fourth shield in the second direction, The magnetic head according to any one of Technical Solutions 6 to 9, wherein the fifth conductive member is electrically connected to the first magnetic member and the fourth shield.

[0091] (Technical proposal 11) the reproducing unit further includes a second reproducing element; The magnetic head described in Technical Solution 6, wherein the reproduction unit is configured to perform a reproduction operation based on a first reproduction signal obtained from the first reproduction element and a second reproduction signal obtained from the second reproduction element.

[0092] (Technical proposal 12) the third conductive member is provided between the third shield and the first magnetic member, 12. The magnetic head according to any one of Technical Solutions 3 to 11, wherein the third conductive member is electrically connected to the third shield.

[0093] (Technical proposal 13) The magnetic head according to any one of Technical Solutions 3 to 12, wherein the fourth conductive member is electrically connected to the fourth shield.

[0094] (Technical proposal 14) the fourth conductive member includes a second conductive portion; the second conductive portion is connected to the first conductive portion; A magnetic head described in any one of technical proposals 1 to 13, wherein the second conductive portion is provided between at least a portion of the first magnetic member and at least a portion of the fourth shield in the second direction.

[0095] (Technical proposal 15) the first reproducing element further includes a second magnetic member; The magnetic head according to any one of Technical Solutions 1 to 14, wherein the direction from the first magnetic member to the second magnetic member is along the third direction.

[0096] (Technical proposal 16) the first reproducing element further includes a first conductive member and a second conductive member; the first conductive member is provided between the first shield and the first magnetic member in the first direction, The magnetic head according to any one of Technical Solutions 1 to 15, wherein the second conductive member is provided between the first magnetic member and the second shield in the first direction.

[0097] (Technical proposal 17) The magnetic head described in any one of Technical Schemes 1 to 16, wherein the first magnetic member includes at least one selected from the group consisting of Co2MnGa, Co2MnAl, FePt, MnGa, Mn3Sn, Mn3Ge, Mn3Ga, RuO2, MnTe, CrSb, and Mn5Si3.

[0098] (Technical proposal 18) Further comprising a recording unit, The magnetic head according to any one of Technical Solutions 1 to 8, wherein the direction from the reproducing section to the recording section is along the first direction.

[0099] (Technical proposal 19) The magnetic head according to any one of Technical Solutions 1 to 18, wherein the length of the first magnetic member along the third direction is longer than the length of the first magnetic member along the second direction.

[0100] (Technical proposal 20) A magnetic head according to any one of technical proposals 1 to 6; a magnetic recording medium; Equipped with The magnetic recording device, wherein the reproducing section is capable of reproducing information recorded on the magnetic recording medium.

[0101] According to the embodiment, it is possible to provide a magnetic head and a magnetic recording device that can improve characteristics.

[0102] 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.

[0103] 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 layer, conductive 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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]

[0108] 11, 12: first and second magnetic members, 11a, 11b: first and second portions, 15a, 15b: first and second magnetic layers, 31: first insulating member, 31a-31d: first to fourth insulating regions, 41-44: first to fourth shields, 43F: first end portion, 44F: second end portion, 51-55: first to fifth terminals, 61-65: first to fifth conductive members, 64a, 64b: first and second conductive portions, 70: reproducing section, 70F: medium facing surface, 70a, 70b: first and second reproducing elements, 75a-75c: first to third circuits, 80: magnetic recording medium, 80a, 80b: first and second recording regions, 81: magnetic recording layer, 82: medium substrate 83: magnetization, 85: medium movement direction, 90: recording unit, 91, 92: first and second magnetic poles, 93: recording element, 110-116: magnetic head, 150: magnetic recording device, 154: suspension, 155: arm, 156: voice coil motor, 157: bearing portion, 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, AR: arrow, D1-D3: first to third directions, L1-L3: length, V1-V3: first to third signals, d1, d2: 1st, 2nd distance

Claims

1. a reproducing unit including a first reproducing element; The first reproducing element is A first shield; A second shield; and A third shield; and a fourth shield, wherein a second direction from the third shield to the fourth shield intersects with a first direction from the first shield to the second shield; and a first magnetic member provided between the first shield and the second shield and between the third shield and the fourth shield, the first magnetic member including a first portion and a second portion; a non-magnetic third conductive member electrically connected to the first portion; a non-magnetic fourth conductive member electrically connected to the second portion; Including, the fourth conductive member includes a first conductive portion; a first position of the third conductive member in the second direction is between a position of the third shield in the second direction and a fourth shield position of the fourth shield in the second direction; a second position of the first conductive portion in the second direction is between the first position and the fourth shield position; the third shield includes a first end corresponding to the medium facing surface; the fourth shield includes a second end corresponding to the medium facing surface, a first distance in a third direction between the first end and the third conductive member is shorter than a second distance in the third direction between the second end and the first conductive portion; The magnetic head, wherein the third direction intersects with a plane including the first direction and the second direction.

2. The first reproducing element is a first terminal electrically connected to the first shield; a second terminal electrically connected to the second shield; a third terminal electrically connected to the third shield; a fourth terminal electrically connected to the fourth conductive member; The magnetic head of claim 1 further comprising:

3. 3. The magnetic head according to claim 2, wherein the voltage between the third terminal and the fourth terminal is configured to change in accordance with a magnetic field to be detected when a current flows between the first terminal and the second terminal.

4. The first reproducing element is a fifth terminal electrically connected to the fourth shield; a first signal between the third terminal and the fifth terminal is configured to change in accordance with a magnetic field to be detected when a current flows between the first terminal and the second terminal; 3. The magnetic head of claim 2, wherein the second signal between the third terminal and the fourth terminal is configured to change in accordance with the magnetic field to be detected when the current flows between the first terminal and the second terminal.

5. the first end and the second end face a magnetic recording medium, the magnetic recording medium includes a first recording area and a second recording area, a direction from the first recording area to the second recording area is along the second direction; 5. The magnetic head according to claim 4, wherein the magnetic field to be detected depends on the state of the first recording area and the state of the second recording area.

6. the first signal is in response to a first component of the first magnetization of the first recording area along the third direction and a second component of the second magnetization of the second recording area along the third direction, The magnetic head according to claim 5 , wherein the second signal corresponds to a component along the second direction based on the first magnetization and the second magnetization.

7. the reproducing unit further includes a second reproducing element; 5. The magnetic head according to claim 4, wherein the reproducing section is configured to perform a reproducing operation based on a first reproducing signal obtained from the first reproducing element and a second reproducing signal obtained from the second reproducing element.

8. the first reproducing element further includes a second magnetic member; 8. The magnetic head according to claim 1, wherein the direction from the first magnetic member to the second magnetic member is along the third direction.

9. The first magnetic member is Co ２ MnGa, Co ２ MnAl, FePt, MnGa, Mn ３ Sn, Mn ３ Ge, Mn ３ Ga, RuO ２ , MnTe, CrSb, and Mn ５ Si ３ 8. The magnetic head according to claim 1, comprising at least one selected from the group consisting of:

10. A magnetic head according to any one of claims 1 to 4, a magnetic recording medium; Equipped with The magnetic recording device, wherein the reproducing section is capable of reproducing information recorded on the magnetic recording medium.

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