Magnetic head and magnetic recording device

Abstract

To provide a magnetic head and a magnetic recording device capable of improving characteristics.SOLUTION: The magnetic head 113 includes the reproducing portion 70. The reproducing part 70 includes the first shield 41 including the first shield region 41a, the second shield 42 including the second shield region 42b, the reproducing elements 20s, the first terminals 51 electrically connected to the first shield 41, the second terminals 52 electrically connected to the second shield 42, and the third terminals 53. The reproducing elements 20s include a first magnetic layer 21, a second magnetic layer 22, and a third magnetic layer 23. The first magnetic layer 21 is provided between the first shield region 41a and the second shield region 42b. At least a portion of the second magnetic layer 22 is provided between the first shield region 41a and the first magnetic layer 21. The third magnetic layer 23 is provided between the first shield 41 and at least a portion of the second magnetic layer 22. The third terminal 53 is electrically connected to the second magnetic layer 22.SELECTED DRAWING: Figure 4

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 layer is used to reproduce information recorded on a magnetic recording medium such as an HDD (Hard Disk Drive), and improvements in the characteristics of the magnetic head 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. The reproducing section includes a first shield including a first shield region, a second shield including a second shield region, a reproducing element, a first terminal electrically connected to the first shield, a second terminal electrically connected to the second shield, and a third terminal. The reproducing element includes a first magnetic layer, a second magnetic layer, and a third magnetic layer. The first magnetic layer is provided between the first shield region and the second shield region. At least a portion of the second magnetic layer is provided between the first shield region and the first magnetic layer. The third magnetic layer is provided between the first shield and at least a portion of the second magnetic layer. The third terminal is electrically connected to the second magnetic layer. [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] 2A and 2B are schematic views illustrating the magnetic head according to the first embodiment. [Figure 3] 3A and 3B are schematic views illustrating the magnetic head according to the first embodiment. [Figure 4] 4A and 4B are schematic views illustrating the magnetic head according to the first embodiment. [Figure 5] 5A and 5B are schematic views illustrating the magnetic head according to the first embodiment. [Figure 6] FIG. 6 is a schematic perspective view illustrating the magnetic head and the magnetic recording device according to the embodiment. [Figure 7] FIG. 7 is a schematic perspective view illustrating a part of the magnetic recording device according to the embodiment. [Figure 8] FIG. 8 is a schematic perspective view illustrating the magnetic recording device according to the embodiment. [Figure 9] 9A and 9B 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. 1(b) is a plan view. Fig. 1(a) is a cross-sectional view taken along line A1-A2 in Fig. 1(b). As shown in Figs. 1(a) and 1(b), the magnetic head 110 according to the embodiment includes a reproducing section 70. The reproducing section 70 includes a first shield 41, a second shield 42, a reproducing element 20s, a first terminal 51, a second terminal 52, and a third terminal 53.

[0009] The first shield 41 includes a first shield region 41a. The second shield 42 includes a second shield region 42b. In this example, the first shield 41 further includes a third shield region 41c. The second shield 42 further includes a fourth shield region 42d. The first terminal 51 is electrically connected to the first shield 41. The second terminal 52 is electrically connected to the second shield 42.

[0010] The reproducing element 20s includes a first magnetic layer 21, a second magnetic layer 22, and a third magnetic layer 23. In this example, the reproducing element 20s further includes a fourth magnetic layer 24. The fourth magnetic layer 24 will be described later.

[0011] The first magnetic layer 21 is provided between the first shield region 41a and the second shield region 42b. At least a portion of the second magnetic layer 22 is provided between the first shield region 41a and the first magnetic layer 21. The third magnetic layer 23 is provided between the first shield 41 and at least a portion of the second magnetic layer 22. The third terminal 53 is electrically connected to the second magnetic layer 22.

[0012] For example, the reproducing unit 70 includes a medium facing surface 70F. The medium facing surface 70F faces the magnetic recording medium 80. The reproducing unit 70 reproduces information recorded on the magnetic recording medium 80. For example, the reproducing unit 70 detects the state of magnetization corresponding to the information recorded on the magnetic recording medium 80. The magnetic recording medium 80 may be, for example, a perpendicular magnetic recording medium. FIG. 1(b) corresponds to a plan view of the medium facing surface 70F.

[0013] For example, the first signal between the first terminal 51 and the second terminal 52 changes depending on the magnetization state of the magnetic recording medium 80. The first signal corresponds to, for example, a reproduction signal. The second signal between the third terminal 53 and the second terminal 52 is thought to correspond to, for example, the instability (thermal fluctuation) of the magnetization of the second magnetic layer 22. The second signal corresponds to, for example, a noise signal. The first signal includes a noise component caused by the instability of the magnetization of the second magnetic layer 22, which is thought to be derived from the second signal. By correcting the reproduction signal of the first signal using the second signal, the influence of the noise component can be suppressed. Stable reproduction is possible even at high recording densities. According to the embodiment, a magnetic head capable of improving characteristics can be provided.

[0014] As shown in FIG. 1A, the magnetic recording device 210 according to the embodiment may include a magnetic head 110 and a control unit 75. The control unit 75 may include, for example, a first circuit 75a, a second circuit 75b, and a third circuit 75c. The first circuit 75a is configured to detect a first signal S1 generated between the first terminal 51 and the second terminal 52. The second circuit 75b is configured to detect a second signal S2 generated between the first terminal 51 and the third terminal 53. The third circuit 75c may be, for example, a processor. The third circuit 75c is configured to correct the first signal S1 (reproduced signal) using the second signal S2. The third circuit 75c is configured to output a third signal S3 obtained by the correction. In one example, a first sampled waveform obtained by sampling the first signal S1 is corrected based on a second sampled waveform obtained by sampling the second signal S2. A correction coefficient may be applied as necessary during the correction. The signal obtained by the correction process is the third signal S3. In the correction, a high-order correction coefficient derived from the second signal S2 may be applied to correct the first signal S1. The signal obtained by the correction process is the third signal S3.

[0015] In this way, the control unit 75 is configured to output a third signal S3 obtained by correcting the first signal S1 between the first terminal 51 and the second terminal 52 using the second signal S2 between the first terminal 51 and the third terminal 53, for example. Noise in the reproduction signal is suppressed in the magnetic recording device 210. A magnetic recording device capable of improving characteristics can be provided.

[0016] For example, the magnetization of the first magnetic layer 21 changes depending on the magnetization state of the magnetic recording medium 80. The first magnetic layer 21 may correspond to, for example, a magnetization free layer. The magnetization of the second magnetic layer 22 is less likely to change than the magnetization of the first magnetic layer 21. The second magnetic layer 22 may correspond to, for example, a reference layer.

[0017] As already described, the first shield 41 may further include a third shield region 41c. The second shield 42 may further include a fourth shield region 42d. In this example, the second magnetic layer 22 includes a first magnetic portion 22a and a second magnetic portion 22b. The first magnetic portion 22a is provided between the first shield region 41a and the first magnetic layer 21. The second magnetic portion 22b is provided between the third shield region 41c and the fourth shield region 42d.

[0018] 1(b), the reproducing unit 70 may further include a third shield 43 and a fourth shield 44. A second direction D2 from the third shield 43 to the fourth shield 44 intersects with a first direction D1 from the first shield region 41a to the second shield region 42b. At least a portion of the reproducing element 20s is disposed between the third shield 43 and the fourth shield 44 in the second direction D2.

[0019] A third direction D3 from the first shield region 41a to the third shield region 41c intersects with a plane including the first direction D1 and the second direction D2. The direction from the second shield region 42b to the fourth shield region 42d is along the third direction D3.

[0020] For example, the direction from the magnetic recording medium 80 to the reproducing unit 70 is the Z-axis direction. A direction perpendicular to the Z-axis direction is the X-axis direction. A direction perpendicular to the Z-axis direction and the X-axis direction is the Y-axis direction. The Z-axis direction is, for example, the height direction. The X-axis direction is, for example, the down-track direction. The Y-axis direction is, for example, the cross-track direction.

[0021] The first direction D1 may correspond to, for example, the X-axis direction, the second direction D2 may correspond to, for example, the Y-axis direction, and the third direction D3 may correspond to, for example, the Z-axis direction.

[0022] In this example, the read element 20s further includes a connecting non-magnetic layer 68. The connecting non-magnetic layer 68 is provided between the second magnetic portion 22b and the fourth shield region 42d. The connecting non-magnetic layer 68 is electrically connected to the second magnetic portion 22b and the third terminal 53. The connecting non-magnetic layer 68 is conductive. The connecting non-magnetic layer 68 provides stable electrical connection.

[0023] The connecting non-magnetic layer 68 may contain, for example, at least one selected from the group consisting of Al, Cu, and W. A good electrical connection can be obtained.

[0024] For example, the third magnetic layer 23 is provided between the third shield region 41c and the second magnetic portion 22b in the first direction D1.

[0025] The third magnetic layer 23 may include, for example, at least one selected from the group consisting of IrMn and PtMn. The third magnetic layer 23 may include an antiferromagnetic material. The third magnetic layer 23 makes it easy to stably control the magnetization of the second magnetic layer 22.

[0026] As shown in FIG. 1B, the read element 20s may further include a fourth magnetic layer 24 and an intermediate non-magnetic layer 67. The fourth magnetic layer 24 may correspond to, for example, a magnetization fixed layer. A portion 24p of the fourth magnetic layer 24 is provided between the first shield region 41a and the first magnetic portion 22a. Another portion 24q of the fourth magnetic layer 24 is provided between the third shield region 41c and the second magnetic portion 22b. The intermediate non-magnetic layer 67 is provided between the fourth magnetic layer 24 and the second magnetic layer 22. Another portion 24q of the fourth magnetic layer 24 is provided between the third magnetic layer 23 and the second magnetic portion 22b. For example, the fourth magnetic layer 24 may be antiferromagnetically coupled to the second magnetic layer 22.

[0027] The intermediate non-magnetic layer 67 includes at least one selected from the group consisting of, for example, Ru, Cu, and Ir. The thickness (length along the first direction D1) of the intermediate non-magnetic layer 67 may be, for example, 0.1 nm to 1.0 nm, or 1.4 nm to 2.2 nm, or 2.6 nm to 3.5 nm. Stable antiferromagnetic coupling via the intermediate non-magnetic layer 67 can be obtained.

[0028] 1A, the third magnetic layer 23 includes a first end 23a and a second end 23b. The direction from the first end 23a to the second end 23b is along the third direction D3. For example, the first end 23a is located between the medium facing surface 70F and the second end 23b in the third direction D3.

[0029] The connecting nonmagnetic layer 68 includes a third end 68c and a fourth end 68d. The direction from the third end 68c to the fourth end 68d is along the third direction. The third end 68c is located between the medium facing surface 70F and the fourth end 68d in the third direction D3. In this example, the position of the first end 23a in the third direction D3 is between the position of the third end 68c in the third direction D3 and the position of the second end 23b in the third direction D3.

[0030] For example, the distance along the third direction D3 between the medium facing surface 70F and the connecting non-magnetic layer 68 is shorter than the distance along the third direction D3 between the medium facing surface 70F and the third magnetic layer 23. For example, a connecting non-magnetic layer 68 with a large area is provided. For example, a signal caused by instability of magnetization in the second magnetic layer 22 can be efficiently detected.

[0031] As shown in FIG. 1(a), the reproducing element 20s may further include a first non-magnetic layer 61. The first non-magnetic layer 61 is provided between the second magnetic layer 22 (first magnetic portion 22a) and the first magnetic layer 21. The first non-magnetic layer 61 includes, for example, at least one selected from the group consisting of oxygen and nitrogen, and a first element. The first element includes at least one selected from the group consisting of Mg and Al. The first non-magnetic layer 61 includes, for example, MgO. For example, a large magnetoresistance effect can be obtained. For example, high sensitivity can be easily obtained.

[0032] The read element 20s may further include a second non-magnetic layer 62. The second non-magnetic layer 62 is provided between the first magnetic layer 21 and the second shield region 42b. The second non-magnetic layer 62 may include at least one selected from the group consisting of Ru, Ta, and Cu, for example. Such a second non-magnetic layer 62 can suppress the magnetic influence from the second shield 42 on the first magnetic layer 21. For example, high sensitivity is easily obtained. The second non-magnetic layer 62 is conductive.

[0033] The read element 20s may further include a third non-magnetic layer 63. The third non-magnetic layer 63 is provided between the first shield region 41a and the first magnetic portion 22a. In this example, the third non-magnetic layer 63 is provided between the first shield region 41a and a portion 24p of the fourth magnetic layer 24. The third non-magnetic layer 63 may include, for example, at least one selected from the group consisting of Ru, Ta, Cu, and NiTa.

[0034] The first magnetic layer 21 may include, for example, at least one selected from the group consisting of Fe, Co, and Ni. The fourth magnetic layer 24 may include, for example, at least one selected from the group consisting of Fe and Co. The first magnetic layer 21 and the fourth magnetic layer 24 may be, for example, ferromagnetic layers. The second magnetic layer 22 may include, for example, at least one selected from the group consisting of Fe and Co. The second magnetic layer 22 may be, for example, a ferromagnetic layer.

[0035] In the embodiment, the second magnetic layer 22 may include, for example, at least one selected from the group consisting of Co2MnGa, Co2MnAl, FePt, MnGa, Mn3Sn, Mn3Ge, Mn3Ga, RuO2, MnTe, CrSb, and Mn5Si3. The second magnetic layer 22 may include, for example, a Heusler material. For example, a highly sensitive second signal S2 is easily obtained. For example, the second signal S2 may include a component based on the anomalous Hall effect.

[0036] 1(b), the third shield 43 may be provided between a portion of the first shield 41 and a portion of the second shield 42 in the first direction D1. The fourth shield 44 may be provided between another portion of the first shield 41 and another portion of the second shield 42 in the first direction D1.

[0037] The reproducing element 20s may further include an insulating member 31. The insulating member 31 may include a first insulating region 31a, a second insulating region 31b, a third insulating region 31c, a fourth insulating region 31d, and a fifth insulating region 31e. The first insulating region 31a is provided between a portion of the first shield 41 and the third shield 43 in the first direction D1. The second insulating region 31b is provided between another portion of the first shield 41 and the fourth shield 44 in the first direction D1. The third insulating region 31c is provided between the third shield 43 and the reproducing element 20s in the second direction D2. The fourth insulating region 31d is provided between the reproducing element 20s and the fourth shield 44 in the second direction D2. A direction from at least a portion of the reproducing element 20s to the fifth insulating region 31e is along the third direction D3. The insulating member 31 may include, for example, at least one selected from the group consisting of aluminum oxide and silicon oxide.

[0038] The thickness of the first magnetic layer 21 may be, for example, 2.0 nm or more and 10.0 nm or less. The thickness of the second magnetic layer 22 may be, for example, 2.0 nm or more and 5.0 nm or less. The thickness of the fourth magnetic layer 24 may be, for example, 2.0 nm or more and 5.0 nm or less. The thickness of the third magnetic layer 23 may be, for example, 2.0 nm or more and 10.0 nm or less. These thicknesses are lengths in the first direction D1.

[0039] 2A and 2B are schematic views illustrating the magnetic head according to the first embodiment. 2(b) is a plan view. FIG. 2(a) is a cross-sectional view taken along line A1-A2 in FIG. 2(b). As shown in FIGS. 2(a) and 2(b), in the magnetic head 111 according to the embodiment, the configuration of the connecting nonmagnetic layer 68 is different from that in the magnetic head 110. The configuration of the magnetic head 111, except for this, may be the same as the configuration of the magnetic head 110. The configuration of the magnetic recording device 211, except for the above, may be the same as the configuration of the magnetic recording device 210.

[0040] In the magnetic head 111, the reproducing section 70 includes a medium facing surface 70F. The third magnetic layer 23 includes a first end 23a and a second end 23b. The first end 23a is located between the medium facing surface 70F and the second end 23b in the third direction D3. The connecting nonmagnetic layer 68 includes a third end 68c and a fourth end 68d. The third end 68c is located between the medium facing surface 70F and the fourth end 68d in the third direction D3.

[0041] In the magnetic head 111, the position of the third end 68c in the third direction D3 is between the position of the first end 23a in the third direction D3 and the position of the fourth end 68d in the third direction D3.

[0042] In the magnetic head 111, for example, the width (length in the third direction D3) of the region where the second magnetic layer 22 does not overlap with the connecting non-magnetic layer 68 is larger than that in the magnetic head 110. This allows the state of the second magnetic layer 22 to be detected over a wider width (wider region). For example, a larger output can be easily obtained at the third terminal 53.

[0043] 3A and 3B are schematic views illustrating the magnetic head according to the first embodiment. Fig. 3(b) is a plan view. Fig. 3(a) is a cross-sectional view taken along line A1-A2 in Fig. 3(b). As shown in Figs. 3(a) and 3(b), the fourth magnetic layer 24 is omitted from the magnetic head 112 according to the embodiment. The remaining configuration of the magnetic head 112 may be the same as that of the magnetic head 110. The remaining configuration of the magnetic recording device 212 may be the same as that of the magnetic recording device 210.

[0044] In the magnetic head 112, the read element 20s includes a third non-magnetic layer 63. The third non-magnetic layer 63 is provided between the first shield region 41a and the first magnetic portion 22a. The third non-magnetic layer 63 contacts the first shield region 41a and the first magnetic portion 22a. The third non-magnetic layer 63 includes, for example, at least one selected from the group consisting of Ru, Ta, Cu, and NiTa. In the magnetic head 112, for example, the influence of noise is suppressed.

[0045] 4A and 4B are schematic views illustrating the magnetic head according to the first embodiment. Fig. 4(b) is a plan view. Fig. 4(a) is a cross-sectional view taken along line A1-A2 in Fig. 4(b). As shown in Figs. 4(a) and 4(b), the fourth magnetic layer 24 is omitted from the magnetic head 113 according to the embodiment. The configuration of the magnetic head 113, except for this, may be the same as that of the magnetic head 111. The configuration of the magnetic recording device 213, except for the above, may be the same as that of the magnetic recording device 211.

[0046] In the magnetic head 113, the position of the third end 68c in the third direction D3 is between the position of the first end 23a in the third direction D3 and the position of the fourth end 68d in the third direction D3. The third nonmagnetic layer 63 contacts the first shield region 41a and the first magnetic portion 22a. In the magnetic head 113, for example, the influence of noise is suppressed.

[0047] 5A and 5B are schematic views illustrating the magnetic head according to the first embodiment. Fig. 5(b) is a plan view. Fig. 5(a) is a cross-sectional view taken along line A1-A2 in Fig. 5(b). As shown in Figs. 5(a) and 5(b), in the magnetic head 114 according to the embodiment, the configuration of the read element 20s is different from that in the magnetic head 110. The configuration of the magnetic head 114, except for this, may be the same as that of the magnetic head 110. The configuration of the magnetic recording device 214, except for the above, may be the same as that of the magnetic recording device 210.

[0048] In the magnetic head 114, the second magnetic layer 22 is provided between the first shield region 41a and the first magnetic layer 21. The third magnetic layer 23 is provided between the first shield region 41a and the second magnetic layer 22. The third terminal 53 is electrically connected to the second magnetic layer 22.

[0049] An intermediate nonmagnetic layer 67 is provided between the fourth magnetic layer 24 and the second magnetic layer 22. A first nonmagnetic layer 61 is provided between the second magnetic layer 22 and the first magnetic layer 21. The first nonmagnetic layer 61 is provided between the first magnetic layer 21 and the second shield region 42b. A third nonmagnetic layer 63 is provided between the first shield region 41a and the fourth magnetic layer 24.

[0050] In the magnetic head 114, the third magnetic layer 23 may be in contact with the fourth magnetic layer 24.

[0051] (Second embodiment) The second embodiment relates to a magnetic recording device. The magnetic recording device includes the magnetic head according to the first embodiment and a control unit 75. The magnetic recording device 210 including the magnetic head 110, the magnetic recording device 211 including the magnetic head 111, the magnetic recording device 212 including the magnetic head 112, the magnetic recording device 213 including the magnetic head 113, and the magnetic recording device 214 including the magnetic head 114 may include the control unit 75. The control unit 75 is configured to output a third signal S3 obtained by correcting a first signal S1 between the first terminal 51 and the second terminal 52 using a second signal S2 between the first terminal 51 and the third terminal 53. This suppresses the effects of noise and improves characteristics.

[0052] FIG. 6 is a schematic perspective view illustrating the magnetic head and the magnetic recording device according to the embodiment. As shown in FIG. 6, a magnetic head according to the embodiment (for example, a magnetic head 110) includes a reproducing unit 70. The reproducing unit 70 includes a reproducing element 20s. 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.

[0053] 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.

[0054] 6, the third shield 43 and the fourth shield 44 are omitted. The reproducing section 70 is capable of outputting a signal according to the magnetization 83 of the magnetic recording layer 81.

[0055] 6, 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.

[0056] FIG. 7 is a schematic perspective view illustrating a part of the magnetic recording device according to the embodiment. FIG. 7 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.

[0057] 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.

[0058] FIG. 8 is a schematic perspective view illustrating the magnetic recording device according to the embodiment. 9A and 9B 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. 8, 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).

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] FIG. 9(a) is an enlarged perspective view of a head stack assembly 160, illustrating the configuration of a portion of the magnetic recording device. FIG. 9B 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.

[0064] 9(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.

[0065] As shown in FIG. 9( 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 .

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] The embodiments may include the following technical solutions. (Technical proposal 1) Equipped with a playback unit, The playback unit a first shield including a first shield region; a second shield including a second shield region; a reproducing element; a first terminal electrically connected to the first shield; a second terminal electrically connected to the second shield; A third terminal; Including, the reproducing element includes a first magnetic layer, a second magnetic layer, and a third magnetic layer; the first magnetic layer is provided between the first shield region and the second shield region, at least a portion of the second magnetic layer is provided between the first shield region and the first magnetic layer; the third magnetic layer is provided between the first shield and at least the portion of the second magnetic layer, the third terminal is electrically connected to the second magnetic layer;

[0073] (Technical proposal 2) the first shield further includes a third shield region; the second shield further includes a fourth shield region; the second magnetic layer includes a first magnetic portion and a second magnetic portion, the first magnetic portion is provided between the first shield region and the first magnetic layer, The magnetic head described in Technical Solution 1, wherein the second magnetic portion is provided between the third shield region and the fourth shield region.

[0074] (Technical proposal 3) The reproducing unit further includes a third shield and a fourth shield, a second direction from the third shield to the fourth shield intersects with a first direction from the first shield area to the second shield area; at least a portion of the reproducing element is provided between the third shield and the fourth shield in the second direction; a third direction from the first shielding area to the third shielding area intersects with a plane including the first direction and the second direction; A magnetic head according to Technical Solution 2, wherein the direction from the second shield region to the fourth shield region is along the third direction.

[0075] (Technical proposal 4) the read element further includes a connecting non-magnetic layer; the connecting nonmagnetic layer is located between the second magnetic portion and the fourth shield region, The magnetic head described in Technical Solution 3, wherein the connecting non-magnetic layer is electrically connected to the second magnetic portion and the third terminal.

[0076] (Technical proposal 5) The magnetic head according to Technical Solution 4, wherein the connecting non-magnetic layer contains at least one selected from the group consisting of Al, Cu, and W.

[0077] (Technical proposal 6) The magnetic head described in Technical Solution 4 or 5, wherein the third magnetic layer is provided between the third shield region and the second magnetic portion in the first direction.

[0078] (Technical proposal 7) the reproducing section includes a medium facing surface, the third magnetic layer includes a first end and a second end, the first end is located between the medium facing surface and the second end in the third direction, the connecting nonmagnetic layer includes a third end and a fourth end, the third end is located between the medium facing surface and the fourth end in the third direction, A magnetic head described in any one of technical proposals 4 to 6, wherein the position of the first end in the third direction is between the position of the third end in the third direction and the position of the second end in the third direction.

[0079] (Technical proposal 8) the reproducing section includes a medium facing surface, the third magnetic layer includes a first end and a second end, the first end is located between the medium facing surface and the second end in the third direction, the connecting nonmagnetic layer includes a third end and a fourth end, the third end is located between the medium facing surface and the fourth end in the third direction, A magnetic head described in any one of technical proposals 4 to 6, wherein the position of the third end in the third direction is between the position of the first end in the third direction and the position of the fourth end in the third direction.

[0080] (Technical proposal 9) the read element further includes a fourth magnetic layer and an intermediate non-magnetic layer; a portion of the fourth magnetic layer is provided between the first shield region and the first magnetic portion, another portion of the fourth magnetic layer is provided between the third shield region and the second magnetic portion, The magnetic head according to any one of Technical Solutions 2 to 8, wherein the intermediate non-magnetic layer is provided between the fourth magnetic layer and the second magnetic layer.

[0081] (Technical proposal 10) The magnetic head according to Technical Solution 9, wherein the intermediate non-magnetic layer contains at least one selected from the group consisting of Ru, Cu, and Ir.

[0082] (Technical proposal 11) The magnetic head according to Technical Solution 9 or 10, wherein the other part of the fourth magnetic layer is provided between the third magnetic layer and the second magnetic part.

[0083] (Technical proposal 12) 12. The magnetic head according to any one of Technical Solutions 9 to 11, wherein the fourth magnetic layer is antiferromagnetically coupled to the second magnetic layer.

[0084] (Technical proposal 13) The magnetic head according to any one of Technical Solutions 2 to 12, wherein the third magnetic layer includes at least one selected from the group consisting of IrMn and PtMn.

[0085] (Technical proposal 14) the read element further includes a third non-magnetic layer; the third nonmagnetic layer is provided between the first shield region and the first magnetic portion, The magnetic head according to any one of Technical Solutions 2 to 13, wherein the third non-magnetic layer includes at least one selected from the group consisting of Ru, Ta, Cu, and NiTa.

[0086] (Technical proposal 15) the read element further includes a third non-magnetic layer; the third nonmagnetic layer is provided between the first shield region and the first magnetic portion, the third nonmagnetic layer is in contact with the first shield region and the first magnetic portion, The magnetic head according to any one of Technical Solutions 2 to 9, wherein the third non-magnetic layer includes at least one selected from the group consisting of Ru, Ta, Cu, and NiTa.

[0087] (Technical proposal 16) The magnetic head described in any one of Technical Schemes 1 to 15, wherein the second magnetic layer includes at least one selected from the group consisting of Co2MnGa, Co2MnAl, FePt, MnGa, Mn3Sn, Mn3Ge, Mn3Ga, RuO2, MnTe, CrSb, and Mn5Si3.

[0088] (Technical proposal 17) the second magnetic layer is provided between the first shield region and the first magnetic layer, The magnetic head described in Technical Solution 1, wherein the third magnetic layer is provided between the first shield region and the second magnetic layer.

[0089] (Technical proposal 18) the read element further includes a first non-magnetic layer; the first nonmagnetic layer is provided between the second magnetic layer and the first magnetic layer, the first nonmagnetic layer contains at least one selected from the group consisting of oxygen and nitrogen and a first element, The magnetic head according to any one of Technical Schemes 1 to 17, wherein the first element includes at least one selected from the group consisting of Mg and Al.

[0090] (Technical proposal 19) the read element further includes a second non-magnetic layer; the second nonmagnetic layer is provided between the first magnetic layer and the second shield region, The magnetic head according to any one of Technical Solutions 1 to 18, wherein the second non-magnetic layer includes at least one selected from the group consisting of Ru, Ta, and Cu.

[0091] (Technical proposal 20) A magnetic head according to any one of technical proposals 1 to 19; A control unit; Equipped with The control unit is configured to output a third signal obtained by correcting a first signal between the first terminal and the second terminal using a second signal between the first terminal and the third terminal.

[0092] According to the embodiment, it is possible to provide a magnetic head and a magnetic recording device that can improve characteristics.

[0093] 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.

[0094] 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 each element included in the magnetic head and magnetic recording device, such as the shield, magnetic layer, conductive member, and terminal, 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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]

[0099] 20s: reproducing element, 21-24: first to fourth magnetic layers, 22a, 22b: first and second magnetic portions, 23a, 23b: first and second ends, 24p, 24q: part, 31: insulating member, 31a-31e: first to fifth insulating regions, 41-44: first to fourth shields, 41a, 41c: first and third shield regions, 42b, 42d: second and fourth shield regions, 51-53: first to third terminals, 61-63: first to third non-magnetic layers, 67: intermediate non-magnetic layer, 68: connecting non-magnetic layer, 68c, 68d: third and fourth ends, 70: reproducing section, 70F: medium facing surface, 75: control section, 75a-75c: first to third circuits, 80: magnetic recording medium, 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, 110-114: 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, 210-214: magnetic recording device, AR: arrow, D1~D3: 1st~3rd direction, S1~S3: 1st~3rd signal

Claims

1. Equipped with a playback unit, The playback unit a first shield including a first shield region; a second shield including a second shield region; a reproducing element; a first terminal electrically connected to the first shield; a second terminal electrically connected to the second shield; A third terminal; Including, the reproducing element includes a first magnetic layer, a second magnetic layer, and a third magnetic layer; the first magnetic layer is provided between the first shield region and the second shield region, at least a portion of the second magnetic layer is provided between the first shield region and the first magnetic layer; the third magnetic layer is provided between the first shield and at least the portion of the second magnetic layer, The third terminal is electrically connected to the second magnetic layer.

2. the first shield further includes a third shield region; the second shield further includes a fourth shield region; the second magnetic layer includes a first magnetic portion and a second magnetic portion, the first magnetic portion is provided between the first shield region and the first magnetic layer, The magnetic head according to claim 1 , wherein the second magnetic portion is provided between the third shield region and the fourth shield region.

3. the reproducing unit further includes a third shield and a fourth shield, a second direction from the third shield to the fourth shield intersects with a first direction from the first shield area to the second shield area; at least a portion of the read element is provided between the third shield and the fourth shield in the second direction; a third direction from the first shield region to the third shield region intersects with a plane including the first direction and the second direction; The magnetic head according to claim 2 , wherein the direction from the second shield region to the fourth shield region is along the third direction.

4. the read element further includes a connecting non-magnetic layer; the connecting nonmagnetic layer is located between the second magnetic portion and the fourth shield region, The magnetic head according to claim 3 , wherein the connecting nonmagnetic layer is electrically connected to the second magnetic portion and the third terminal.

5. The magnetic head according to claim 4 , wherein the third magnetic layer is provided between the third shield region and the second magnetic portion in the first direction.

6. the reproducing section includes a medium facing surface, the third magnetic layer includes a first end and a second end, the first end is located between the medium facing surface and the second end in the third direction, the connecting nonmagnetic layer includes a third end and a fourth end, the third end is located between the medium facing surface and the fourth end in the third direction, 5. The magnetic head according to claim 4, wherein the position of the first end in the third direction is between the position of the third end in the third direction and the position of the second end in the third direction.

7. the read element further includes a fourth magnetic layer and an intermediate non-magnetic layer; a portion of the fourth magnetic layer is provided between the first shield region and the first magnetic portion, another portion of the fourth magnetic layer is provided between the third shield region and the second magnetic portion, 3. The magnetic head according to claim 2, wherein the intermediate non-magnetic layer is provided between the fourth magnetic layer and the second magnetic layer.

8. 3. The magnetic head according to claim 2, wherein the third magnetic layer includes at least one selected from the group consisting of IrMn and PtMn.

9. The second magnetic layer is made of 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 2. The magnetic head of claim 1, comprising at least one selected from the group consisting of:

10. A magnetic head according to any one of claims 1 to 9, A control unit; Equipped with The control unit is configured to output a third signal obtained by correcting a first signal between the first terminal and the second terminal using a second signal between the first terminal and the third terminal.

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