Magnetic head and magnetic recording device

Abstract

To provide a magnetic head and a magnetic recording device capable of improving characteristics.SOLUTION: According to the embodiment, a magnetic head includes a reproducing unit including a medium-facing surface. The reproducing unit includes first to fourth shields and a first magnetic member. The third shield includes a first region, a first other region, and a first intermediate region. The first region is provided between the first other region and the first magnetic member in a second direction. The first intermediate region is provided between the first other region and the first region in the second direction. The length of the first region in a third direction of the first region is shorter than the length of the first other region in the third direction of the first other region. The third direction intersects with the medium-facing surface. A first width in the second direction of the first region is half or more of the width of the first magnetic member in the second direction of the first magnetic member.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] A magnetic head including a magnetic sensor using a magnetic layer is used to reproduce information recorded on a magnetic recording medium such as an HDD (Hard Disk Drive). Improvements in the characteristics of magnetic heads are desired. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] Applied Physics Letters, "Perspective on nanoscale magnetic sensors using giant anomalous Hall effect in topological magnetic materials for read head application in magnetic recording", Tomoya Nakatani, Prabhanjan D. Kulkarni, Hirofumi Suto, Keisuke Masuda, Hitoshi Iwasaki, Yuya Sakuraba, 124, 070501 (2024) 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 medium facing surface. The reproducing section includes a first shield, a second shield, a third shield, a fourth shield, and a first magnetic member. A first direction from the first shield to the second shield is along the medium facing surface. A second direction from the third shield to the fourth shield is along the medium facing surface and intersects the first direction. The first magnetic member is provided between the first shield and the second shield and between the third shield and the fourth shield. The third shield includes a first region, a first other region, and a first intermediate region. The first region is provided between the first other region and the first magnetic member in the second direction. The first intermediate region is provided between the first other region and the first region in the second direction. A first region length of the first region in the third direction is shorter than a first other region length of the first other region in the third direction. The third direction intersects the medium facing surface. A first intermediate length of the first intermediate region in the third direction varies in the second direction, and a first width of the first region in the second direction is equal to or greater than half the width of the first magnetic member in the second direction. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a schematic cross-sectional view 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 plan 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 perspective view illustrating the magnetic head and magnetic recording device according to the second 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) 1 and 2 are schematic cross-sectional views illustrating the magnetic head according to the first embodiment. FIG. 3 is a schematic plan view illustrating the magnetic head according to the first embodiment. Fig. 1 is a cross-sectional view taken along line Y1-Y2 in Fig. 3. Fig. 2 is a cross-sectional view taken along line X1-X2 in Fig. 3. As shown in FIGS. 1 to 3, the magnetic head 110 according to the embodiment includes a reproducing section 70. The reproducing section 70 includes a medium facing surface 10F. The medium facing surface 10F faces a magnetic recording medium 80. The reproducing section 70 is configured to reproduce information recorded on the magnetic recording medium 80. The magnetic recording medium 80 is, for example, a perpendicular recording medium. FIG. 3 illustrates the reproducing section 70 as viewed from the medium facing surface 10F.

[0009] The reproducing section 70 includes a first shield 41, a second shield 42, a third shield 43, a fourth shield 44, and a first magnetic member 11.

[0010] A first direction D1 from the first shield 41 to the second shield 42 runs along the medium facing surface 10F. A second direction D2 from the third shield 43 to the fourth shield 44 runs along the medium facing surface 10F and intersects with the first direction D1.

[0011] 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 may be, for example, the Y-axis direction. The medium facing surface 10F is, for example, along the XY plane. The Z-axis direction corresponds, for example, to the height direction. The X-axis direction corresponds, for example, to the down-track direction. The Y-axis direction corresponds, for example, to the cross-track 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.

[0013] In this example, at least a portion of the third shield 43 is provided between the first shield 41 and the second shield 42 in the first direction D1. At least a portion of the fourth shield 44 is provided between the first shield 41 and the second shield 42 in the first direction D1.

[0014] 1, the third shield 43 includes a first region r1, a first other region ra1, and a first intermediate region rb1. The first region r1 is provided between the first other region ra1 and the first magnetic member 11 in the second direction D2. The first intermediate region rb1 is provided between the first other region ra1 and the first region r1 in the second direction D2.

[0015] The direction intersecting the medium facing surface 10F is defined as a third direction D3. The third direction D3 may be, for example, substantially perpendicular to the medium facing surface 10F. The third direction D3 may be, for example, the Z-axis direction.

[0016] The length (height) of the first region r1 in the third direction D3 is defined as the first region length h1. The length (height) of the first other region ra1 in the third direction D3 is defined as the first other region length ha1. The first region length h1 is shorter than the first other region length ha1. The first region r1 is a portion that is short in length in the height direction. The first other region ra1 is a portion that is long in length in the height direction.

[0017] The length of the first intermediate region rb1 in the third direction is defined as a first intermediate length hb1. The first intermediate length hb1 varies in the second direction D2. The first intermediate region rb1 is an inclined portion.

[0018] The first width w1 of the first region r1 in the second direction D2 is equal to or greater than half the first magnetic member width w11 of the first magnetic member 11 in the second direction D2.

[0019] In the embodiment, the magnetization of the first magnetic member 11 (first magnetic member magnetization 11M) changes in accordance with the magnetization of the magnetic recording medium 80. By detecting a signal in accordance with the change in the magnetization of the first magnetic member 11, the magnetization (recorded direction) of the magnetic recording medium 80 can be reproduced. For example, the angle between the direction of the current flowing through the first magnetic member 11 and the first magnetic member magnetization 11M changes in accordance with the magnetization of the magnetic recording medium 80.

[0020] As described above, in the embodiment, the third shield 43 includes the first other region ra1 that is long in the height direction, which can reduce the electrical resistance of the third shield 43. For example, noise can be suppressed.

[0021] In the first region r1, the length in the height direction (first region length h1) is substantially constant. The cross-sectional shape of the first region r1 is rectangular. As a result, the magnetization of the first region r1 (first region magnetization r1M) is uniformed so that it is aligned with the second direction D2. For example, in the portion of the first region r1 facing the first magnetic member 11, the component of the magnetization in the third direction D3 is suppressed. As a result, the interaction between the magnetization of the first region r1 (first region magnetization r1M) and the magnetization of the first magnetic member 11 (first magnetic member magnetization 11M) is uniformed. As a result, a highly accurate signal can be stably obtained. A reproduction signal with suppressed noise can be obtained. According to the embodiment, a magnetic head capable of improving characteristics can be provided.

[0022] In one example, the magnetization of the first region r1 (first region magnetization r1M) is substantially along the second direction D2.

[0023] On the other hand, for example, the side of the first intermediate region rb1 whose height changes is inclined with respect to the third direction D3. The magnetization of the first intermediate region rb1 includes, for example, a component in the third direction D3 in addition to a component in the second direction D2. In the embodiment, the first region r1 is provided between the first intermediate region rb1 and the first magnetic member 11. This allows a highly accurate signal to be stably obtained. Noise is suppressed.

[0024] In this embodiment, the first width w1 may be longer than the first region length h1. This allows for more stable control of the magnetization of the first region r1 based on shape anisotropy. For example, the first width w1 may be 1.1 times or more the first region length h1. This makes it easier to obtain a stable magnetization state.

[0025] In the embodiment, the first width w1 may be 1 to 3 times the first magnetic member width w11. When the first width w1 is 1 or more times the first magnetic member width w11, the magnetization in the first region r1 is likely to be stable. When the first width w1 is 3 or less times the first magnetic member width w11, the electrical resistance in the first region r1 is likely to be kept low.

[0026] The first region r1 has a substantially constant length in the height direction. For example, the variation in the first region length h1 in the first region r1 is 0.9 to 1.1 times the average length of the first region r1 in the third direction D3.

[0027] 1, the fourth shield 44 may include a second region r2, a second other region ra2, and a second intermediate region rb2. The second region r2 is provided between the first magnetic member 11 and the second other region ra2 in the second direction D2. The second intermediate region rb2 is provided between the second region r2 and the second other region ra2 in the second direction D2.

[0028] The second region length h2 of the second region r2 in the third direction D3 is shorter than the second other region length ha2 of the second other region ra2 in the third direction D3. The second intermediate length hb2 of the second intermediate region rb2 in the third direction D3 varies in the second direction D2. The second width w2 of the second region r2 in the second direction D2 is equal to or greater than half the first magnetic member width w11. Stable magnetization is also obtained in the second region r2 of the fourth shield 44. This uniformizes the interaction between the magnetization of the second region r2 (second region magnetization r2M) and the magnetization of the first magnetic member 11 (first magnetic member magnetization 11M). High-precision signals are stably obtained. A reproduction signal with suppressed noise is obtained.

[0029] For example, the magnetization of the first region r1 (first region magnetization r1M) and the magnetization of the second region r2 (second region magnetization r2M) are aligned along the second direction D2. As a result, the spin torque from the first region r1 and the spin torque from the second region r2 cancel each other out, thereby suppressing spin torque noise.

[0030] For example, the magnetization of the second region r2 (second region magnetization r2M) may be substantially along the second direction D2.

[0031] The second width w2 may be longer than the second region length h2. This allows for more stable control of the magnetization of the second region r2 based on shape anisotropy. For example, the second width w2 may be 1.1 times or more the second region length h2. This makes it easier to obtain a stable magnetization state.

[0032] In this embodiment, the second width w2 may be 1 to 3 times the first magnetic member width w11. When the second width w2 is 1 or more times the first magnetic member width w11, the magnetization in the second region r2 is likely to be stable. When the second width w2 is 3 or less times the first magnetic member width w11, the electrical resistance in the second region r2 is likely to be kept low.

[0033] The second region r2 has a substantially constant length in the height direction. For example, the variation in the second region length h2 in the second region r2 is 0.9 to 1.1 times the average length of the second region r2 in the third direction D3.

[0034] 1, the third shield shape of the third shield 43 in a cross section in the first plane PL1 including the first direction D1 and the third direction D3 is preferably symmetrical with the fourth shield shape of the fourth shield 44 in that cross section about the first line Ln1. The first line Ln1 passes through the center of the first magnetic member 11 in the second direction D2 and extends along the third direction D3. With this configuration, the spin torque from the third shield 43 and the spin torque from the fourth shield 44 are canceled out with higher accuracy. This allows for further noise reduction.

[0035] In the embodiment, the first other region length ha1 may be 1.5 times or more the first region length h1. The first other region length ha1 may be twice or more the first region length h1. The first other region length ha1 may be five times or more the first region length h1. The second other region length ha2 may be 1.5 times or more the second region length h2. The second other region length ha2 may be twice or more the second region length h2. The second other region length ha2 may be five times or more the second region length h2. By having long first other region length ha1 and second other region length ha2, low electrical resistance can be easily obtained in the first other region ra1 and second other region ra2. Noise can be further suppressed.

[0036] 3, the playback unit 70 may include a first terminal 41T, a second terminal 42T, a third terminal 43T, and a fourth terminal 44T. The first terminal 41T is electrically connected to the first shield 41. The second terminal 42T is electrically connected to the second shield 42. The third terminal 43T is electrically connected to the third shield 43. The fourth terminal 44T is electrically connected to the fourth shield 44.

[0037] 3, the magnetic recording device 210 according to the embodiment includes the magnetic head 110 according to the embodiment and a magnetic recording medium 80 facing the medium facing surface 10F. The reproducing unit 70 is capable of reproducing information recorded on the magnetic recording medium 80.

[0038] The magnetic recording device 210 may further include a first circuit 51 and a second circuit 52. The first circuit 51 is configured to supply a current between the third terminal 43T and the fourth terminal 44T. The second circuit 52 is configured to detect a voltage between the first terminal 41T and the second terminal 42T. The voltage is configured to change depending on the magnetization state recorded on the magnetic recording medium 80.

[0039] This change in voltage may be based on, for example, the anomalous Hall effect (AHE). For example, the first magnetic member 11 may have the anomalous Hall effect. For example, the first magnetic member 11 may include at least one selected from the group consisting of CoMnGa, CoMnAl, and FePt. In such materials, a large anomalous Hall effect is likely to be obtained. For example, a large detection output is likely to be obtained. CoMnGa and CoMnAl are, for example, Heusler alloy materials.

[0040] In an embodiment, the first shield 41 may be electrically connected to the first magnetic member 11. The second shield 42 may be electrically connected to the first magnetic member 11. The third shield 43 may be electrically connected to the first magnetic member 11. The fourth shield 44 may be electrically connected to the first magnetic member 11.

[0041] 3, the reproduction section 70 may include a first shield-side conductive member 31 and a second shield-side conductive member 32. The first shield-side conductive member 31 is provided between the first shield 41 and the first magnetic member 11 in the first direction D1. The second shield-side conductive member 32 is provided between the first magnetic member 11 and the second shield 42 in the first direction D1.

[0042] At least one of the first shield-side conductive member 31 and the second shield-side conductive member 32 includes, for example, 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. For example, the first magnetic member 11 and the first shield 41 are electrically connected to each other by appropriate electrical resistance. For example, the first magnetic member 11 and the second shield 42 are electrically connected to each other by appropriate electrical resistance.

[0043] 3, the reproduction section 70 may include a third shield-side conductive member 33 and a fourth shield-side conductive member 34. The third shield-side conductive member 33 is provided between the third shield 43 and the first magnetic member 11 in the second direction D2. The fourth shield-side conductive member 34 is provided between the first magnetic member 11 and the fourth shield 44 in the second direction D2.

[0044] At least one of the third shield side conductive member 33 and the fourth shield side conductive member 34 includes, for example, Cu, Au, Ag, Pt, Al, Pd, Ta, Ru, Hf, W, Mo, Ir, Cr, Tb, and Rh. The third shield side conductive member 33 may include, for example, at least one selected from the group consisting of Ta, Pt, W, Ir, Cr, and Tb. In this case, for example, the spin torque acting on the magnetization of the first magnetic member 11 (first magnetic member magnetization 11M) from the magnetization of the first region r1 (first region magnetization r1M) can be reduced. The fourth shield side conductive member 34 may include, for example, at least one selected from the group consisting of Ta, Pt, W, Ir, Cr, and Tb. In this case, for example, the spin torque acting on the magnetization of the first magnetic member 11 (first magnetic member magnetization 11M) from the magnetization of the second region r2 (second region magnetization r2M) can be reduced.

[0045] 2, the playback unit 70 may include an insulating member 10i. A portion of the insulating member 10i is provided between a portion of the first shield 41 and the third shield 43. Another portion of the insulating member 10i is provided between another portion of the first shield 41 and the fourth shield 44. Another portion of the insulating member 10i is provided between the third shield 43 and a portion of the second shield 42. Another portion of the insulating member 10i is provided between the fourth shield 44 and another portion of the second shield 42.

[0046] FIG. 4 is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment. FIG. 4 is a cross-sectional view corresponding to the cross section taken along line Y1-Y2 in FIG. 4, in the magnetic head 111 according to the embodiment, the configurations of the third shield 43 and the fourth shield 44 are different from those of the magnetic head 110. Except for this, the configuration of the magnetic head 111 may be the same as that of the magnetic head 110.

[0047] 4, in the magnetic head 111, the first region length h1 is longer than the first magnetic member length h11 in the third direction D3 of the first magnetic member 11. This makes it easier to obtain a lower electrical resistance in the first region r1.

[0048] In this example, the second region length h2 is longer than the first magnetic member length h11, which makes it easier to obtain a lower electrical resistance in the second region r2.

[0049] FIG. 5 is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment. FIG. 5 is a cross-sectional view corresponding to the cross section taken along line Y1-Y2 in FIG. 5, in the magnetic head 112 according to the embodiment, the reproducing section 70 includes a second magnetic member 12. The configuration of the magnetic head 112 other than this may be the same as the configuration of the magnetic head 110 or the magnetic head 111.

[0050] In the magnetic head 112, the position of the second magnetic member 12 in the second direction D2 is between the position of the third shield 43 in the second direction D2 and the position of the fourth shield 44 in the second direction D2. The direction from the first magnetic member 11 to the second magnetic member 12 is along the third direction D3. The second magnetic member 12 controls, for example, the component of the first region magnetization r1M along the third direction D3 and the component of the second region magnetization r2M along the third direction D3.

[0051] The magnetization of the second magnetic member 12 (second magnetic member magnetization 12M) is, for example, along the second direction D2.

[0052] In this example, at least a portion of the second magnetic member 12 is provided between the first region r1 and the second region r2 in the second direction D2. At least a portion of the second magnetic member 12 may be provided between the first intermediate region rb1 and the second intermediate region rb2 in the second direction D2. At least a portion of the second magnetic member 12 may be provided between the first other region ra1 and the second other region ra2 in the second direction D2.

[0053] (Second embodiment) The second embodiment relates to a magnetic recording device 210 (see FIG. 3). As already explained, the magnetic recording device 210 includes the magnetic head according to the first embodiment (for example, magnetic heads 110-112) and a magnetic recording medium 80 facing the medium facing surface 10F. The magnetic recording device 210 may include a first circuit 51 and a second circuit 52. Below, an example will be described in which the magnetic head 110 is used as the magnetic head.

[0054] FIG. 6 is a schematic perspective view illustrating the magnetic head and magnetic recording device according to the second embodiment. 6, the magnetic head 110 may include a recording unit 90. The recording unit 90 records information on the magnetic recording medium 80. The reproducing unit 70 reproduces the information recorded on the magnetic recording medium 80.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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).

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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 .

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] The embodiments may include the following technical solutions. (Technical proposal 1) a reproducing section including a medium-facing surface; The playback unit A first shield; a second shield, wherein a first direction from the first shield to the second shield is along the medium facing surface; The third shield, a fourth shield, wherein a second direction from the third shield to the fourth shield is along the medium facing surface and intersects with the first direction; a first magnetic member provided between the first shield and the second shield and between the third shield and the fourth shield; Including, the third shield includes a first region, a first other region, and a first intermediate region; the first region is provided between the first other region and the first magnetic member in the second direction, the first intermediate region is provided between the first other region and the first region in the second direction, a first region length in the third direction of the first region is shorter than a first other region length in the third direction of the first other region; the third direction intersects with the medium facing surface, a first intermediate length of the first intermediate region in the third direction that varies in the second direction; a first width of the first region in the second direction that is equal to or greater than half of a width of the first magnetic member in the second direction;

[0075] (Technical proposal 2) The magnetic head according to Technical Solution 1, wherein the first width is longer than the first region length.

[0076] (Technical proposal 3) The magnetic head described in Technical Solution 1, wherein the first width is 1.1 times or more the length of the first region.

[0077] (Technical proposal 4) The magnetic head according to any one of Technical Solutions 1 to 3, wherein the first width is 1 to 3 times the width of the first magnetic member.

[0078] (Technical proposal 5) A magnetic head described in any one of Technical Solutions 1 to 4, wherein the change in the first region length in the first region is 0.9 to 1.1 times the average length in the third direction in the first region.

[0079] (Technical proposal 6) the fourth shield includes a second region, a second other region, and a second intermediate region; the second region is provided between the first magnetic member and the second other region in the second direction, the second intermediate region is provided between the second region and the second other region in the second direction, a second region length in the third direction of the second region is shorter than a second other region length in the third direction of the second other region; a second intermediate length of the second intermediate region in the third direction that varies in the second direction; The magnetic head according to any one of Technical Solutions 1 to 5, wherein the second width of the second region in the second direction is equal to or greater than half the width of the first magnetic member.

[0080] (Technical proposal 7) The magnetic head according to Technical Solution 6, wherein the second region magnetization of the second region is substantially along the second direction.

[0081] (Technical proposal 8) The magnetic head according to any one of Technical Solutions 1 to 7, wherein the first region magnetization of the first region is substantially along the second direction.

[0082] (Technical proposal 9) a third shield shape of the third shield in a cross section on a first plane including the first direction and the third direction is symmetrical with a fourth shield shape of the fourth shield in the cross section with respect to a first line, The magnetic head according to any one of Technical Solutions 1 to 8, wherein the first line passes through the center of the first magnetic member in the second direction and extends along the third direction.

[0083] (Technical proposal 10) The magnetic head according to any one of Technical Schemes 1 to 9, wherein the length of the first other region is 1.5 times or more the length of the first region.

[0084] (Technical proposal 11) The magnetic head according to any one of Technical Solutions 1 to 10, wherein the first region length is longer than the first magnetic member length in the third direction of the first magnetic member.

[0085] (Technical proposal 12) the reproducing unit further includes a second magnetic member; a position of the second magnetic member in the second direction is between a position of the third shield in the second direction and a position of the fourth shield in the second direction, The magnetic head according to any one of Technical Solutions 1 to 11, wherein the direction from the first magnetic member to the second magnetic member is along the third direction.

[0086] (Technical proposal 13) The magnetic head according to Technical Solution 12, wherein the second magnetic member magnetization of the second magnetic member is along the second direction.

[0087] (Technical proposal 14) The playback unit a third shield-side conductive member provided between the third shield and the first magnetic member in the second direction; a fourth shield-side conductive member provided between the first magnetic member and the fourth shield in the second direction; further comprising A magnetic head described in any one of technical proposals 1 to 13, wherein at least one of the third shield side conductive member and the fourth shield side conductive member includes at least one selected from the group consisting of Ta, Pt, W, Ir, Cr, and Tb.

[0088] (Technical proposal 15) The playback unit a first shield-side conductive member provided between the first shield and the first magnetic member in the first direction; a second shield-side conductive member provided between the first magnetic member and the second shield in the first direction; further comprising A magnetic head described in any one of technical proposals 1 to 14, wherein at least one of the first shield side conductive member and the second shield side conductive member includes 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.

[0089] (Technical proposal 16) The magnetic head according to any one of Technical Schemes 1 to 15, wherein the first magnetic member includes at least one selected from the group consisting of CoMnGa, CoMnAl, and FePt.

[0090] (Technical proposal 17) the third shield is electrically connected to the first magnetic member, The magnetic head according to any one of Technical Solutions 1 to 16, wherein the fourth shield is electrically connected to the first magnetic member.

[0091] (Technical proposal 18) The playback unit 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 shield; The magnetic head according to any one of Technical Solutions 1 to 17, further comprising: (Technical proposal 19) A magnetic head according to Technical Proposal 18; a magnetic recording medium facing the medium facing surface; Equipped with The magnetic recording device, wherein the reproducing section is capable of reproducing information recorded on the magnetic recording medium.

[0092] (Technical proposal 20) The first circuit, A second circuit; Furthermore, the first circuit is configured to supply a current between the third terminal and the fourth terminal; the second circuit is configured to detect a voltage between the first terminal and the second terminal; The magnetic recording device described in Technical Solution 19 is configured so that the voltage changes depending on the magnetization state recorded on the magnetic recording medium.

[0093] According to the embodiment, it is possible to provide a magnetic head and a magnetic recording device that can improve characteristics.

[0094] 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.

[0095] 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, intermediate layer, 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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]

[0100] 10F: medium facing surface, 10i: insulating member, 11, 12: first and second magnetic members, 11M, 12M: first and second magnetic member magnetization, 31-34: first to fourth shield-side conductive members, 41-44: first to fourth shields, 41T-44T: first to fourth terminals, 51, 52: first and second circuits, 70: reproducing unit, 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, 110-112: magnetic head, 150, 210: magnetic recording device, 154: suspension, 155: arm, 156: voice coil motor, 157: bearing unit 158: Head gimbal assembly, 159: Head slider, 159A: Air inflow side, 159B: Air outflow 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 to D3: First to third directions, Ln1: First line, PL1: First plane, h1, h2: First and second region lengths, h11: First magnetic member length, ha1, ha2: First and second other region lengths, hb1, hb2: First and second intermediate lengths, r1, r2: First and second regions, r1M, r2M: First and second region magnetization, ra1, ra2: First and second other regions, rb1, rb2: first and second intermediate regions, w1, w2: first and second widths, w11: first magnetic member width

Claims

1. a reproducing section including a medium-facing surface; The playback unit A first shield; a second shield, wherein a first direction from the first shield to the second shield is along the medium facing surface; A third shield; and a fourth shield, wherein a second direction from the third shield to the fourth shield is along the medium facing surface and intersects with the first direction; a first magnetic member provided between the first shield and the second shield and between the third shield and the fourth shield; Including, the third shield includes a first region, a first other region, and a first intermediate region; the first region is provided between the first other region and the first magnetic member in the second direction, the first intermediate region is provided between the first other region and the first region in the second direction, a first region length in the third direction of the first region is shorter than a first other region length in the third direction of the first other region; the third direction intersects with the medium facing surface, a first intermediate length of the first intermediate region in the third direction that varies in the second direction; A magnetic head, wherein a first width of the first region in the second direction is equal to or greater than half of a first magnetic member width in the second direction of the first magnetic member.

2. The magnetic head according to claim 1 , wherein the first width is greater than the first region length.

3. the fourth shield includes a second region, a second other region, and a second intermediate region; the second region is provided between the first magnetic member and the second other region in the second direction, the second intermediate region is provided between the second region and the second other region in the second direction, a second region length in the third direction of the second region is shorter than a second other region length in the third direction of the second other region; a second intermediate length of the second intermediate region in the third direction that varies in the second direction; 2. The magnetic head according to claim 1, wherein the second width of the second region in the second direction is equal to or greater than half the width of the first magnetic member.

4. a third shield shape of the third shield in a cross section on a first plane including the first direction and the third direction is symmetrical with a fourth shield shape of the fourth shield in the cross section with respect to a first line, 2. The magnetic head according to claim 1, wherein the first line passes through a center of the first magnetic member in the second direction and extends along the third direction.

5. 5. The magnetic head according to claim 1, wherein the first region length is longer than the first magnetic member length in the third direction of the first magnetic member.

6. the reproducing unit further includes a second magnetic member; a position of the second magnetic member in the second direction is between a position of the third shield in the second direction and a position of the fourth shield in the second direction, 2. 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.

7. The playback unit a third shield-side conductive member provided between the third shield and the first magnetic member in the second direction; a fourth shield-side conductive member provided between the first magnetic member and the fourth shield in the second direction; further comprising 2. The magnetic head according to claim 1, wherein at least one of the third shield side conductive member and the fourth shield side conductive member includes at least one selected from the group consisting of Ta, Pt, W, Ir, Cr, and Tb.

8. The playback unit 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 shield; The magnetic head of claim 1 further comprising:

9. a magnetic head according to claim 8; a magnetic recording medium facing the medium facing surface; Equipped with The magnetic recording device, wherein the reproducing section is capable of reproducing information recorded on the magnetic recording medium.

10. A first circuit; A second circuit; Furthermore, the first circuit is configured to supply a current between the third terminal and the fourth terminal; the second circuit is configured to detect a voltage between the first terminal and the second terminal; 10. The magnetic recording device according to claim 9, wherein the voltage is configured to change depending on the magnetization state recorded on the magnetic recording medium.

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