Magnetic head and magnetic recording device

Abstract

A magnetic head and magnetic recording apparatus capable of increasing recording density are provided. According to an embodiment, the magnetic head includes a first magnetic pole, a second magnetic pole, and a laminate. The first magnetic pole includes a first surface and a second surface intersecting the first surface. The second surface includes a region of the first surface. The second magnetic pole includes a third surface and a fourth surface intersecting the third surface. The fourth surface includes a region of the second surface. A direction from the first surface region toward the second surface region is along a first direction. The first surface region and the second surface region are along a second direction and a third direction. The first surface and the third surface are along a third direction. The laminate is disposed between the first surface region and the second surface region. The laminate includes a first magnetic layer and a second magnetic layer. The second magnetic layer includes a second magnetic layer facing the second surface region. The width ratio of the second width of the second magnetic layer along the third direction to the first width of the first surface region along the third direction is 0.25 or more and 0.92 or less.

Description

[0001] This application is based on Japanese Patent Application 2022-126244 (filed on August 8, 2022), under which it enjoys priority benefits. This application incorporates the entire contents of that application by reference. Technical Field

[0002] Embodiments of the present invention relate to magnetic heads and magnetic recording devices. Background Technology

[0003] Information is recorded using a magnetic head on magnetic recording media such as HDDs (Hard Disk Drives). Increasing recording density is desired in both the magnetic head and the magnetic recording device. Summary of the Invention

[0004] Embodiments of the present invention provide a magnetic head and a magnetic recording apparatus capable of increasing recording density.

[0005] Technical solutions for solving the problem

[0006] According to an embodiment of the present invention, a magnetic head includes a first magnetic pole, a second magnetic pole, and a laminate. The first magnetic pole includes a first surface and a second surface intersecting the first surface. The second surface includes a first surface region continuous with the first surface. The second magnetic pole includes a third surface and a fourth surface intersecting the third surface. The fourth surface includes a second surface region. The second surface region is continuous with the third surface. A direction from the first surface region toward the second surface region is along a first direction. The first surface region and the second surface region are along a second direction and a third direction. The third direction intersects a plane encompassing the first and second directions. The first surface and the third surface are along the third direction. The laminate is disposed between the first surface region and the second surface region. The laminate includes: a first magnetic layer; and a second magnetic layer disposed between the first magnetic layer and the second surface region. The second magnetic layer includes a second magnetic layer facing the second surface region. The width ratio of the second width of the second magnetic layer along the third direction to the first width of the first surface region along the third direction is greater than 0.25 and less than 0.92.

[0007] Based on the magnetic head constructed as described above, it is possible to provide a magnetic head and a magnetic recording device that can improve recording density. Attached Figure Description

[0008] Figure 1 (a) and Figure 1 (b) is a schematic diagram illustrating the magnetic head according to the first embodiment.

[0009] Figure 2This is a schematic cross-sectional view illustrating the magnetic recording apparatus according to the first embodiment.

[0010] Figure 3 This is a graph illustrating the characteristics of the magnetic head.

[0011] Figure 4 This is a graph illustrating the characteristics of the magnetic head.

[0012] Figure 5 This is a schematic diagram illustrating the operation of the magnetic head according to the first embodiment.

[0013] Figure 6 This is a schematic top view illustrating the magnetic head according to the first embodiment.

[0014] Figure 7 This is a schematic top view illustrating the magnetic head according to the first embodiment.

[0015] Figure 8 This is a schematic top view illustrating the magnetic head according to the first embodiment.

[0016] Figure 9 (a) and Figure 9 (b) is a schematic diagram illustrating the magnetic head according to the first embodiment.

[0017] Figure 10 (a) and Figure 10 (b) is a schematic diagram illustrating the magnetic head according to the first embodiment.

[0018] Figure 11 This is a schematic perspective view illustrating the magnetic recording apparatus according to an exemplary embodiment.

[0019] Figure 12 This is a schematic perspective view illustrating a portion of a magnetic recording apparatus according to an exemplary embodiment.

[0020] Figure 13 This is a schematic perspective view illustrating the magnetic recording apparatus according to an exemplary embodiment.

[0021] Figure 14 (a) and Figure 14 (b) is a schematic perspective view of a portion of the magnetic recording apparatus according to an exemplary embodiment.

[0022] Label Explanation

[0023] 20-layer stack; 20D electronic circuit; 21-24 first to fourth magnetic layers; 21M, 22M magnetization; 30D recording circuit; 30F dielectric opposing plane; 30c coil; 30i insulating part; 31, 32 first and second magnetic poles; 33 shielding; 41-45 first to fifth non-magnetic layers; 60 recording part; 70 reproduction part; 71 magnetic reproduction element; 72a, 72b first reproduction layer. Magnetic shielding component, second reproduction magnetic shielding component; 80 magnetic recording medium; 81 magnetic recording layer; 82 dielectric substrate; 83 magnetization; 85 dielectric movement direction; 110-112, 110a-110c magnetic heads; 150 magnetic recording device; 154 suspension; 155 arm; 156 voice coil motor; 157 bearing section; 158 head universal joint assembly; 159 head slider; 159A air inlet side; 159B air outlet side; 16 0. Head stack assembly; 161. Support frame; 162. Coil; 180. Recording media disk; 180. Spindle motor; 181. Recording medium; 190. Signal processing unit; 210. Magnetic recording device; AR, AR1 arrows; D1~D3 1st direction~3rd direction; F1~F4 1st surface~4th surface; Ha1. Alternating magnetic field; Iw. Recording current; L1~L3 1st length~3rd length; P1 parameter; Pa1. Alternating power; RL1. Length ratio; Rw1. Width ratio; T1, T2 1st terminal, 2nd terminal; W1, W2 1st wiring, 2nd wiring; d1, d2 1st thickness, 2nd thickness; ic current; je electron flow; r1~r5 1st surface area~5th surface area; t1~t4 1st thickness~4th thickness; t41~t45 1st non-magnetic layer thickness~5th non-magnetic layer thickness; w1~w3 1st width~3rd width Detailed Implementation

[0024] Hereinafter, various embodiments of the present invention will be described with reference to the accompanying drawings.

[0025] The accompanying drawings are schematic or conceptual, and the relationships between the thicknesses and widths of the parts, as well as the ratios between the sizes of the parts, are not necessarily limited to the same situation as in reality. Even when representing the same parts, they are sometimes shown in different ways with different dimensions and ratios depending on the accompanying drawings.

[0026] In this application specification and figures, the same reference numerals are used for elements that have been described with respect to the preceding figures, and detailed descriptions are omitted where appropriate.

[0027] (First Embodiment)

[0028] Figure 1 (a) and Figure 1 (b) is a schematic diagram illustrating the magnetic head according to the first embodiment.

[0029] Figure 1(a) is a sectional view. Figure 1 (b) is from Figure 1 Arrow AR1 in (a) shows the top view observed.

[0030] Figure 2 This is a schematic cross-sectional view illustrating the magnetic recording apparatus according to the first embodiment.

[0031] like Figure 2 As shown, the magnetic recording apparatus 210 according to the embodiment includes a magnetic head 110 and electronic circuitry 20D. The magnetic recording apparatus 210 may also include a magnetic recording medium 80. At least a recording operation is performed in the magnetic recording apparatus 210. During the recording operation, information is recorded in the magnetic recording medium 80 using the magnetic head 110.

[0032] The magnetic head 110 includes a recording section 60. As described later, the magnetic head 110 may also include a playback section. The recording section 60 includes a first magnetic pole 31, a second magnetic pole 32, and a laminate 20. The laminate 20 is disposed between the first magnetic pole 31 and the second magnetic pole 32.

[0033] For example, the first magnetic pole 31 and the second magnetic pole 32 form a magnetic circuit. The first magnetic pole 31 is, for example, the main magnetic pole. The second magnetic pole 32 is, for example, a trailing shield.

[0034] The direction from the magnetic recording medium 80 towards the magnetic head 110 is defined as the Z-axis. A direction perpendicular to the Z-axis is defined as the X-axis. A direction perpendicular to both the Z-axis and X-axis is defined as the Y-axis. The Z-axis corresponds, for example, to the height direction. The X-axis corresponds, for example, to the downtrack direction. The Y-axis corresponds, for example, to the crosstrack direction. The magnetic recording medium 80 and the magnetic head 110 move relative to each other along the downtrack direction. A magnetic field (recording magnetic field) generated by the magnetic head 110 is applied to the desired position of the magnetic recording medium 80. The magnetization of the magnetic recording medium 80 at the desired position is controlled in a direction corresponding to the recording magnetic field. Thus, information is recorded on the magnetic recording medium 80. For example, perpendicular magnetic recording is performed.

[0035] like Figure 2 As shown, a coil 30c is provided. In this example, a portion of the coil 30c is located between the first magnetic pole 31 and the second magnetic pole 32. In this example, a shield 33 is provided. In the X-axis direction, the first magnetic pole 31 is located between the shield 33 and the second magnetic pole 32. Another portion of the coil 30c is located between the shield 33 and the first magnetic pole 31. An insulating portion 30i is provided between these multiple elements. The shield 33 is, for example, a guide shield. The magnetic head 110 may also include a side shield (not shown).

[0036] like Figure 2As shown, a recording current Iw is supplied from the recording circuit 30D to the coil 30c. A recording magnetic field corresponding to the recording current Iw is applied from the first magnetic pole 31 to the magnetic recording medium 80.

[0037] like Figure 2 As shown, the first magnetic pole 31 includes a dielectric-facing surface 30F. The dielectric-facing surface 30F is, for example, an ABS (Air Bearing Surface). The dielectric-facing surface 30F is, for example, opposite to the magnetic recording medium 80. The dielectric-facing surface 30F is, for example, along the XY plane.

[0038] like Figure 2 As shown, electronic circuit 20D is electrically connected to laminate 20. In this example, laminate 20 is electrically connected to first magnetic pole 31 and second magnetic pole 32. A first terminal T1 and a second terminal T2 are provided on the magnetic head 110. The first terminal T1 is electrically connected to laminate 20 via first wiring W1 and first magnetic pole 31. The second terminal T2 is electrically connected to laminate 20 via second wiring W2 and second magnetic pole 32. Current (e.g., direct current) is supplied from electronic circuit 20D to laminate 20.

[0039] like Figure 1 As shown in (b), a current ic is supplied to such a stack 20. For example, the current ic is supplied from the aforementioned electronic circuit 20D. Figure 1 As shown in (b), in this example, the current ic has a direction from the second magnetic layer 22 toward the first magnetic layer 21. Figure 1 As shown in (b), the electron flow je accompanying the current ic has a direction from the first magnetic layer 21 toward the second magnetic layer 22. The direction of the current ic is from the second magnetic pole 32 toward the first magnetic pole 31.

[0040] For example, by flowing a current ic above a threshold in the stack 20, the magnetization of the magnetic layers included in the stack 20 oscillates. The stack 20 functions, for example, as a Spin-Torque Oscillator. Accompanying the oscillation, an alternating magnetic field (e.g., a high-frequency magnetic field) is generated from the stack 20. The alternating magnetic field generated in the stack 20 is applied to the magnetic recording medium 80 to assist writing to the magnetic recording medium 80. For example, MAMR (Microwave Assisted Magnetic Recording) can be implemented.

[0041] like Figure 1 (a) and Figure 1As shown in (b), in this example, the laminate 20 includes a third magnetic layer 23, a fourth magnetic layer 24, a first non-magnetic layer 41, a second non-magnetic layer 42, a third non-magnetic layer 43, a fourth non-magnetic layer 44, and a fifth non-magnetic layer 45. Figure 1 (a) and Figure 1 The insulating part 30i is omitted in (b).

[0042] The first magnetic pole 31 includes a first surface F1 and a second surface F2. The second surface F2 intersects with the first surface F1. The second surface F2 includes the first surface region r1. The first surface region r1 is continuous with the first surface F1. The first surface F1 corresponds to the dielectric opposing surface 30F.

[0043] The second magnetic pole 32 includes a third surface F3 and a fourth surface F4. The fourth surface F4 intersects with the third surface F3. The fourth surface F4 includes the second surface region r2. The second surface region r2 is continuous with the third surface F3. The third surface F3 is, for example, along a plane that includes the first surface F1.

[0044] The direction from the first surface region r1 toward the second surface region r2 is along the first direction D1. The first surface region r1 and the second surface region r2 are along the second direction D2 and the third direction D3. The third direction D3 intersects the plane containing the first direction D1 and the second direction D2. The first surface F1 and the third surface F3 are along the third direction D3. The laminate 20 is disposed between the first surface region r1 and the second surface region r2.

[0045] The third direction D3 is, for example, along the Y-axis. The first direction D1 can also be along the X-axis. The first direction D1 is along the gap direction (the direction of the gap between the first magnetic pole 31 and the second magnetic pole 32). The first direction D1 can also be tilted relative to the X-axis. The first direction D1 corresponds to the stacking direction of the laminate 20. The second direction D2 can correspond to the height direction. The second direction D2 can also be tilted relative to the Z-axis.

[0046] The laminate 20 includes a first magnetic layer 21 and a second magnetic layer 22. The second magnetic layer 22 is disposed between the first magnetic layer 21 and the second surface region r2.

[0047] like Figure 1 (a) and Figure 1 As shown in (b), the second magnetic layer 22 includes a second magnetic surface layer 22F. The second magnetic surface layer 22F faces the second surface region r2. The second magnetic surface layer 22F is a surface on one side of the second surface region r2.

[0048] like Figure 1As shown in (b), the width of the first surface region r1 along the third direction D3 is defined as the first width w1. The width of the second magnetic layer 22F along the third direction D3 is defined as the second width w2. In the embodiment, the width ratio (w2 / w1) of the second width w2 to the first width w1 is 0.25 or more and 0.92 or less. Therefore, as described later, an alternating magnetic field is generated efficiently. Highly efficient MAMR can be implemented. According to the embodiment, a magnetic head that can improve recording density can be provided.

[0049] like Figure 1 As shown in (a), the second surface F2 may also include a third surface region r3. The first surface region r1 is located between the first surface F1 and the third surface region r3. The third surface region r3 is along the second direction D2 and the third direction D3. The third surface region r3 is substantially parallel to the first surface region r1. The third surface region r3 is continuous with the first surface region r1.

[0050] like Figure 1 As shown in (a), the fourth face F4 also includes the fourth face region r4 and the fifth face region r5. The direction from the third face region r3 toward the fourth face region r4 is along the first direction D1. The fourth face region r4 is along the second direction D2 and the third direction D3. The fourth face region r4 is substantially parallel to the second face region r2.

[0051] The distance along the first direction D1 between the first surface region r1 and the second surface region r2 is taken as the first distance d1. The distance along the first direction D1 between the third surface region r3 and the fourth surface region r4 is taken as the second distance d2. The first distance d1 is shorter than the second distance d2.

[0052] The fifth surface region r5 is located between the second surface region r2 and the fourth surface region r4. The plane containing the fifth surface region r5 intersects with the plane containing the third surface region r3 and the plane containing the fourth surface region r4.

[0053] The second magnetic pole 32 includes an intersection position 32p, which is the intersection of the plane containing the fifth surface region r5 and the plane containing the fourth surface region r4. In one example, the intersection position 32p is located on the fourth surface F4. In another example, the intersection position 32p is located inside the second magnetic pole 32. The length along the second direction D2 between the intersection position 32p and the third surface F3 is defined as the first length L1. The first length L1 corresponds, for example, to the effective height of the second magnetic pole 32.

[0054] The length of the second magnetic layer 22F along the second direction D2 is defined as a second length L2. The second length L2 corresponds, for example, to the effective height of the second magnetic layer 22F. The ratio of the second length L2 to the first length L1 (L2 / L1) is defined as the length ratio. In this embodiment, this ratio is preferably, for example, 0.1 or more and 0.85 or less. Thus, as described later, an alternating magnetic field is generated efficiently. Highly efficient MAMR can be implemented. According to this embodiment, a magnetic head that increases recording density can be provided.

[0055] like Figure 1 (a) and Figure 1 As shown in (b), in the magnetic head 110, the stack 20 may include, for example, a third magnetic layer 23, a fourth magnetic layer 24, a first non-magnetic layer 41, a second non-magnetic layer 42, a third non-magnetic layer 43, a fourth non-magnetic layer 44, and a fifth non-magnetic layer 45. The third magnetic layer 23 is disposed between the first magnetic pole 31 and the first magnetic layer 21. The fourth magnetic layer 24 is disposed between the first magnetic layer 21 and the second magnetic layer 22.

[0056] A first non-magnetic layer 41 is disposed between the first magnetic pole 31 and the third magnetic layer 23. A second non-magnetic layer 42 is disposed between the third magnetic layer 23 and the first magnetic layer 21. A third non-magnetic layer is disposed between the first magnetic layer 21 and the fourth magnetic layer 24. A fourth non-magnetic layer 44 is disposed between the fourth magnetic layer 24 and the second magnetic layer 22. A fifth non-magnetic layer 45 is disposed between the second magnetic layer 22 and the second magnetic pole 32.

[0057] like Figure 1 As shown in (b), the thickness of the first magnetic layer 21 along the first direction D1 is set as the first thickness t1. The thickness of the second magnetic layer 22 along the first direction D1 is set as the second thickness t2. The thickness of the third magnetic layer 23 along the first direction D1 is set as the third thickness t3. The thickness of the fourth magnetic layer 24 along the first direction D1 is set as the fourth thickness t4.

[0058] In the magnetic head 110, the first thickness t1 is thicker than the third thickness t3. The second thickness t2 is thicker than the fourth thickness t4. The third thickness t3 is, for example, less than 0.7 times the first thickness t1. The fourth thickness t4 is, for example, less than 0.75 times the second thickness t2. For example, the third thickness t3 can be more than 0.1 times the first thickness t1. For example, the fourth thickness t4 can be more than 0.1 times the second thickness t2.

[0059] For example, the first magnetic layer 21 and the second magnetic layer 22 can function as oscillation layers, for example. The third magnetic layer 23 and the fourth magnetic layer 24 can function as spin injection layers, for example. At least one of the first magnetic layer 21, the second magnetic layer 22, the third magnetic layer 23 and the fourth magnetic layer 24 contains, for example, at least one selected from Fe, Co and Ni.

[0060] In one example of the magnetic head 110, the first thickness t1 is, for example, 3 nm or more and 15 nm or less. The first thickness t1 can also be, for example, 5 nm or more and 15 nm or less. The second thickness t2 is, for example, 5 nm or more and 15 nm or less. The third thickness t3 is, for example, 0.5 nm or more and 5 nm or less. The fourth thickness t4 is, for example, 0.5 nm or more and 8 nm or less.

[0061] In the magnetic head 110, the first non-magnetic layer 41, for example, contains at least one selected from Ru, Ir, Ta, Rh, Pd, Pt, and W. The second non-magnetic layer 42, for example, contains at least one selected from Cu, Au, Cr, Al, V, and Ag. For example, the third non-magnetic layer 43 contains at least one selected from Cu, Au, Cr, Al, V, and Ag, and the fourth non-magnetic layer 44 contains at least one selected from Ru, Ir, Ta, Rh, Pd, Pt, and W. Alternatively, for example, the third non-magnetic layer 43 contains at least one selected from Ru, Ir, Ta, Rh, Pd, Pt, and W, and the fourth non-magnetic layer 44 contains at least one selected from Cu, Au, Cr, Al, V, and Ag. The fifth non-magnetic layer 45, for example, contains at least one selected from Cu, Au, Cr, Al, V, and Ag.

[0062] like Figure 1 As shown in (b), the thickness of the first non-magnetic layer 41 along the first direction D1 is set as the thickness t41 of the first non-magnetic layer. The thickness of the second non-magnetic layer 42 along the first direction D1 is set as the thickness t42 of the second non-magnetic layer. The thickness of the third non-magnetic layer 43 along the first direction D1 is set as the thickness t43 of the third non-magnetic layer. The thickness of the fourth non-magnetic layer 44 along the first direction D1 is set as the thickness t44 of the fourth non-magnetic layer. The thickness of the fifth non-magnetic layer 45 along the first direction D1 is set as the thickness t45 of the fifth non-magnetic layer.

[0063] In one example of the magnetic head 110, the thickness t41 of the first non-magnetic layer is, for example, 2 nm or more and 8 nm or less. The thickness t42 of the second non-magnetic layer is, for example, 1 nm or more and 5 nm or less. The thickness t43 of the third non-magnetic layer is, for example, 1 nm or more and 8 nm or less. The thickness t44 of the fourth non-magnetic layer is, for example, 1 nm or more and 8 nm or less. The thickness t45 of the fifth non-magnetic layer is, for example, 1 nm or more and 8 nm or less.

[0064] like Figure 1 As shown in (a), the first magnetic layer 21 has a surface on one side of the second magnetic layer 22. The length of this surface of the first magnetic layer 21 along the second direction D2 is defined as a third length L3. In this embodiment, the third length L3 is longer than the second length L2. Figure 1 As shown in (b), the first magnetic layer 21 has a surface on one side of the second magnetic layer 22. The width of this surface of the first magnetic layer 21 along the third direction D3 is defined as a third width w3. In an embodiment, the third width w3 is wider than the second width w2. For example, the size of the first magnetic layer 21 is larger than the size of the second magnetic layer 22. For example, the resistance of the first magnetic layer 21 is lower than the resistance of the second magnetic layer 22.

[0065] The following is an example of the simulation results regarding the characteristics of the magnetic head 110.

[0066] Figure 3 This is a graph illustrating the characteristics of the magnetic head.

[0067] Figure 3 The horizontal axis represents the width ratio Rw1. As already explained, the width ratio Rw1 is the ratio (w2 / w1) of the second width w2 to the first width w1. The first width w1 is the width of the first surface region r1 along the third direction D3. The second width w2 is the width of the second magnetic layer 22F along the third direction D3. Figure 3 The vertical axis represents the parameter P1, which is related to the magnitude of the alternating resistance change in the second magnetic layer 22. Parameter P1 has been normalized. When parameter P1 is large, the alternating resistance change in the second magnetic layer 22 is large. When the alternating resistance change is large, the alternating electric current accompanying the alternating resistance change acts on the first magnetic layer 21. Thus, an alternating magnetic field is efficiently generated from the first magnetic layer 21.

[0068] The simulation conditions are as follows: Width 1 (w1) is 60 nm. Width 2 (w2) varies. Length 1 (L1) is 50 nm. Length 2 (L2) is 35 nm. Thickness 1 (t1) is 5 nm. Thickness 2 (t2) is 5 nm. Thickness 3 (t3) is 2 nm. Thickness 4 (t4) is 2 nm. Thickness 1 (non-magnetic layer) (t41) is 4 nm. Thickness 2 (non-magnetic layer) (t42) is 2 nm. Thickness 3 (non-magnetic layer) (t43) is 2 nm. Thickness 4 (non-magnetic layer) (t44) is 3 nm. Thickness 5 (non-magnetic layer) (t45) is 2 nm.

[0069] like Figure 3As shown, when the width ratio Rw1 is 0.25 or higher and 0.92 or lower, a parameter P1 of 0.5 or higher is obtained. In the embodiment, a width ratio Rw1 of 0.25 or higher and 0.92 or lower is preferred. When the width ratio Rw1 is 0.25 or higher and 0.92 or lower, the alternating power accompanying the resistance change increases. Through the action of the alternating power, an alternating magnetic field is effectively generated.

[0070] The width ratio Rw1 can also be greater than 0.4 and less than 0.85. A parameter P1 greater than 0.75 can be obtained, resulting in more efficient generation of alternating magnetic fields.

[0071] A larger parameter P1 when the width ratio Rw1 is greater than 0.25 and less than 0.92 is thought to be caused by an increase in the component of the magnetic field supplied to the second magnetic layer 22 from the first magnetic pole 31 and the second magnetic pole 32 that is parallel to the second magnetic layer 22F. It is also thought that the alternating change of resistance at the interface in the resistance of the second magnetic layer 22 increases. The interface is, for example, the second magnetic layer 22F.

[0072] Figure 4 This is a graph illustrating the characteristics of the magnetic head.

[0073] Figure 4 The horizontal axis represents the length ratio RL1. As already explained, the length ratio RL1 is the ratio of the second length L2 to the first length L1 (L2 / L1). The second length L2 is the length (height) of the second magnetic layer 22F along the second direction D2. The first length L1 is the length (height) between the intersection 32p and the third surface F3 along the second direction D2. Figure 4 The vertical axis is parameter P1.

[0074] exist Figure 4 In the example, the first width w1 is 60nm. The second width w2 is 40nm. The first length L1 is 50nm. The second length L2 varies. The first thickness t1 is 5nm. The second thickness t2 is 5nm. The third thickness t3 is 2nm. The fourth thickness t4 is 2nm. The first non-magnetic layer thickness t41 is 4nm. The second non-magnetic layer thickness t42 is 2nm. The third non-magnetic layer thickness t43 is 2nm. The fourth non-magnetic layer thickness t44 is 3nm. The fifth non-magnetic layer thickness t45 is 2nm.

[0075] like Figure 4As shown, when the length ratio RL1 is 0.1 or more and 0.85 or less, a parameter P1 of 0.5 or more is obtained. Consequently, the alternating current, which accompanies the change in resistance, increases. Through the action of the alternating current, an alternating magnetic field is effectively generated. In this embodiment, a length ratio RL1 of 0.1 or more and 0.85 or less is preferred. When the length ratio RL1 is 0.1 or more and 0.85 or less, the alternating current, which accompanies the change in resistance, increases. Through the action of the alternating current, an alternating magnetic field is effectively generated.

[0076] The length ratio RL1 can also be greater than 0.2 and less than 0.72. A parameter P1 greater than 0.75 can be obtained, resulting in a more efficient generation of the alternating magnetic field.

[0077] A larger parameter P1 when the length ratio RL1 is 0.1 or more and 0.85 or less is believed to be caused by an increase in the component of the magnetic field supplied to the second magnetic layer 22 from the first magnetic pole 31 and the second magnetic pole 32 that is parallel to the second magnetic layer 22F. For example, it is believed that the alternating change of resistance at the interface in the resistance of the second magnetic layer 22 increases. The interface is, for example, the second magnetic layer 22F. A larger parameter P1 when the length ratio RL1 is 0.2 or more and 0.7 or less is believed to be caused by a further increase in the component of the magnetic field supplied to the second magnetic layer 22 from the first magnetic pole 31 and the second magnetic pole 32 that is parallel to the second magnetic layer 22F.

[0078] Figure 5 This is a schematic diagram illustrating the operation of the magnetic head according to the first embodiment.

[0079] like Figure 5 As shown, when a current ic exceeding a threshold flows in the laminate 20, the resistance between the first terminal T1 and the second terminal T2 alternates. This alternating resistance generates an alternating electric current Pa1. The alternating electric current Pa1 is applied (overlapped) with the current ic. For example, when the magnetization 22M of the second magnetic layer 22 oscillates, the resistance of the second magnetic layer 22 alternates. When a current ic exceeding a threshold flows in the first magnetic layer 21, the magnetization 21M of the first magnetic layer 21 oscillates. An alternating magnetic field Ha1 is generated from the first magnetic layer 21. The alternating electric current Pa1, based on the resistance change of the second magnetic layer 22, acts on the first magnetic layer 21. The frequency of the alternating magnetic field Ha1 and the frequency of the alternating electric current Pa1 can be substantially synchronized. For example, the alternating magnetic field Ha1 and the alternating electric current Pa1 are synchronized. Alternatively, a current magnetic field can be generated by the alternating electric current Pa1, and the resulting current magnetic field overlaps with the alternating magnetic field Ha1.

[0080] An alternating magnetic field Ha1 is efficiently generated by effectively applying an alternating electric current Pa1 to the first magnetic layer 21 based on the second magnetic layer 22. For example, the magnetization 21M of the first magnetic layer 21 is stabilized by the alternating electric current Pa1, and the alternating magnetic field Ha1 is generated efficiently. By obtaining an efficient resistance change in the second magnetic layer 22, a high-intensity alternating electric current Pa1 can be applied to the first magnetic layer 21.

[0081] In this implementation, efficient resistance variation can be achieved by keeping the width ratio Rw1 within an appropriate range. Similarly, efficient resistance variation can be achieved by keeping the length ratio RL1 within an appropriate range.

[0082] Thus, when a current ic flows in the magnetic head 110, for example, in the laminate 20, an alternating magnetic field Ha1 is generated from the laminate 20, and an alternating electric current Pa1 is generated in the laminate 20. For example, the absolute value of the difference between the first frequency of the alternating magnetic field Ha1 and the second frequency of the alternating electric current Pa1 is less than 0.25 times the first frequency. The absolute value of the difference may also be less than 0.1 times the first frequency.

[0083] In one example, at least a portion of the alternating electric current Pa1 is generated in the second magnetic layer 22. In another example, at least a portion of the alternating magnetic field Ha1 is generated from the first magnetic layer 21. For example, it is considered that at least a portion of the alternating electric current Pa1 is generated from a smaller magnetic layer. For example, it is considered that at least a portion of the alternating magnetic field Ha1 is generated from a larger magnetic layer.

[0084] The magnetic recording apparatus 210 according to the embodiment includes a magnetic head 110 and an electronic circuit 20D. The magnetic head 110 includes a first magnetic pole 31, a second magnetic pole 32, and a laminate 20. The laminate 20 is disposed between the first magnetic pole 31 and the second magnetic pole 32. The electronic circuit 20D is capable of supplying current to the laminate 20. The laminate 20 includes a first magnetic layer 21 and a second magnetic layer 22 disposed between the first magnetic layer 21 and the second magnetic pole 32. When a current ic flows in the laminate 20, an alternating magnetic field Ha1 is generated from the laminate 20, and an alternating electric current Pa1 is generated in the laminate 20.

[0085] In the magnetic recording apparatus 210, the absolute value of the difference between the first frequency of the alternating magnetic field Ha1 and the second frequency of the alternating electric current Pa1 is 0.25 times or less of the first frequency. The absolute value of the difference may also be 0.1 times or less of the first frequency. The first frequency is, for example, 15 GHz or more and 50 GHz or less. The alternating magnetic field Ha1 of the first frequency is applied to the magnetic recording medium 80, effectively implementing MAMR.

[0086] Figures 6-8 This is a schematic top view illustrating the magnetic head according to the first embodiment.

[0087] These images are from Figure 1 Arrow AR1 in (a) shows the top view observed.

[0088] like Figure 6 As shown, in the magnetic head 110a according to the embodiment, the width of the first magnetic pole 31 (e.g., the first width w1 of the first surface region r1) may also be wider than the width of the laminate 20. The width of the laminate 20 is, for example, the maximum value of the length of the laminate 20 in the third direction D3.

[0089] like Figure 7 As shown, in the magnetic head 110b according to the embodiment, the width of the first magnetic pole 31 (e.g., the first width w1 of the first surface region r1) may also be narrower than the width of the laminate 20. The width of the laminate 20 is, for example, the maximum value of the length of the laminate 20 in the third direction D3.

[0090] like Figure 8 As shown, in the magnetic head 110c according to the embodiment, the position of the first magnetic pole 31 in the third direction D3 can also be displaced from the position of the laminate 20 in the third direction D3. The position of the first magnetic pole 31 in the third direction D3 can, for example, be the center position of the first magnetic pole 31 in the third direction D3. The position of the laminate 20 in the third direction D3 can, for example, be the center position of the laminate 20 in the third direction D3.

[0091] The structures of magnetic heads 110a, 110b, and 110c, except as described above, can be the same as those of magnetic head 110. This provides magnetic heads that can improve recording density.

[0092] Figure 9 (a) and Figure 9 (b) is a schematic diagram illustrating the magnetic head according to the first embodiment.

[0093] Figure 9 (a) is a sectional view. Figure 9 (b) is from Figure 9 Arrow AR1 in (a) shows the top view observed.

[0094] like Figure 9 (a) and Figure 9 As shown in (b), the magnetic head 111 in the embodiment also includes a first magnetic pole 31, a second magnetic pole 32, and a stack 20. The structure of the stack 20 in the magnetic head 111 is different from the structure of the stack 20 in the magnetic head 110. Otherwise, the structure of the magnetic head 111 can be the same as that of the magnetic head 110.

[0095] In the magnetic head 111, the laminate 20 includes a first magnetic layer 21, a second magnetic layer 22, a third magnetic layer 23, a fourth magnetic layer 24, a first non-magnetic layer 41, a second non-magnetic layer 42, a third non-magnetic layer 43, a fourth non-magnetic layer 44, and a fifth non-magnetic layer 45. The second magnetic layer 22 is disposed between the first magnetic layer 21 and the second magnetic pole 32. The third magnetic layer 23 is disposed between the first magnetic layer 21 and the second magnetic layer 22. The fourth magnetic layer 24 is disposed between the second magnetic layer 22 and the second magnetic pole 32. The first non-magnetic layer 41 is disposed between the first magnetic pole 31 and the first magnetic layer 21. The second non-magnetic layer 42 is disposed between the first magnetic layer 21 and the third magnetic layer 23. The third non-magnetic layer 43 is disposed between the third magnetic layer 23 and the second magnetic layer 22. The fourth non-magnetic layer 44 is disposed between the second magnetic layer 22 and the fourth magnetic layer 24. The fifth non-magnetic layer 45 is disposed between the fourth magnetic layer 24 and the second magnetic pole 32.

[0096] The first thickness t1 of the first magnetic layer 21 along the first direction D1 is thicker than the third thickness t3 of the third magnetic layer 23 along the first direction D1. The second thickness t2 of the second magnetic layer 22 along the first direction D1 is thicker than the fourth thickness t4 of the fourth magnetic layer 24 along the first direction D1. The third thickness t3 is, for example, less than 0.75 times the first thickness t1. The fourth thickness t4 is, for example, less than 0.7 times the second thickness t2.

[0097] The same characteristics as those of the magnetic head 110 can be obtained in the magnetic head 111. For example, a high parameter P1 can be obtained when the width ratio Rw1 is 0.25 or higher and 0.92 or lower. In the magnetic head 111, a width ratio Rw1 of 0.25 or higher and 0.92 or lower is also preferred. The width ratio Rw1 can also be 0.4 or higher and 0.85 or lower. High-efficiency resistance change can be obtained, and alternating magnetic fields can be generated more effectively.

[0098] In the magnetic head 111, a high parameter P1 can be obtained when the length ratio RL1 is 0.1 or more and 0.85 or less. In the magnetic head 111, a length ratio RL1 of 0.1 or more and 0.85 or less is also preferable. A length ratio RL1 of 0.2 or more and 0.72 or less is also acceptable. This allows for highly efficient resistance changes and more effectively generates an alternating magnetic field.

[0099] Highly efficient MAMR can also be implemented in the magnetic head 111. According to the implementation method, a magnetic head that can improve recording density can be provided.

[0100] In the magnetic head 111, the first non-magnetic layer 41 comprises, for example, at least one selected from Cu, Au, Cr, Al, V, and Ag. For example, the second non-magnetic layer 42 comprises, for example, at least one selected from Ru, Ir, Ta, Rh, Pd, Pt, and W, and the third non-magnetic layer 43 comprises, for example, at least one selected from Cu, Au, Cr, Al, V, and Ag. Alternatively, for example, the second non-magnetic layer 42 comprises at least one selected from Cu, Au, Cr, Al, V, and Ag, and the third non-magnetic layer 43 comprises at least one selected from Ru, Ir, Ta, Rh, Pd, Pt, and W. The fourth non-magnetic layer 44 comprises, for example, at least one selected from Cu, Au, Cr, Al, V, and Ag. The fifth non-magnetic layer 45 comprises, for example, at least one selected from Ru, Ir, Ta, Rh, Pd, Pt, and W.

[0101] In one example of the magnetic head 111, the thickness t41 of the first non-magnetic layer is, for example, 1 nm or more and 8 nm or less. The thickness t42 of the second non-magnetic layer is, for example, 1 nm or more and 8 nm or less. The thickness t43 of the third non-magnetic layer is, for example, 1 nm or more and 8 nm or less. The thickness t44 of the fourth non-magnetic layer is, for example, 1 nm or more and 5 nm or less. The thickness t45 of the fifth non-magnetic layer is, for example, 2 nm or more and 8 nm or less.

[0102] like Figure 9 As shown in (b), a current ic is supplied to the laminate 20 in the magnetic head 111. For example, the current ic has a direction from the first magnetic layer 21 toward the second magnetic layer 22. The electron flow je has a direction from the second magnetic layer 22 toward the first magnetic layer 21.

[0103] Figure 10 (a) and Figure 10 (b) is a schematic diagram illustrating the magnetic head according to the first embodiment.

[0104] Figure 10 (a) is a sectional view. Figure 10 (b) is from Figure 10 Arrow AR1 in (a) shows the top view observed.

[0105] like Figure 10 (a) and Figure 10 As shown in (b), the magnetic head 112 of the embodiment also includes a first magnetic pole 31, a second magnetic pole 32, and a stack 20. The structure of the stack 20 in the magnetic head 112 is different from the structure of the stack 20 in the magnetic head 110. Otherwise, the structure of the magnetic head 112 can be the same as that of the magnetic head 110.

[0106] In the magnetic head 112, the laminate 20 includes a first non-magnetic layer 41. The first non-magnetic layer 41 is disposed between the first magnetic pole 31 and the first magnetic layer 21. The first non-magnetic layer 41 contains, for example, at least one selected from Ru, Ir, Ta, Rh, Pd, Pt, and W.

[0107] In the magnetic head 112, the laminate 20 may include a second non-magnetic layer 42. The second non-magnetic layer 42 is disposed between the first magnetic layer 21 and the second magnetic layer 22. In one example, the second non-magnetic layer 42 may contain at least one selected from Ru, Ir, Ta, Rh, Pd, Pt, and W. In another example, the second non-magnetic layer 42 may also contain at least one selected from Cu, Au, Cr, Al, V, and Ag.

[0108] In the magnetic head 112, the laminate 20 may include a third non-magnetic layer 43. The third non-magnetic layer 43 is disposed between the second magnetic layer 22 and the second magnetic pole 32. In one example, the third non-magnetic layer 43 may contain at least one selected from Cu, Au, Cr, Al, V, and Ag. In another example, the third non-magnetic layer 43 may also contain at least one selected from Ru, Ir, Ta, Rh, Pd, Pt, and W.

[0109] The same characteristics as those of the magnetic head 110 can be obtained in the magnetic head 112. For example, a high parameter P1 is obtained when the width ratio Rw1 is 0.25 or higher and 0.92 or lower. In the magnetic head 111, a width ratio Rw1 of 0.25 or higher and 0.92 or lower is also preferred. The width ratio Rw1 can also be 0.4 or higher and 0.85 or lower. High-efficiency resistance change can be obtained, and alternating magnetic fields can be generated more effectively.

[0110] In the magnetic head 112, a high parameter P1 is obtained when the length ratio RL1 is 0.1 or more and 0.85 or less. In the magnetic head 111, a length ratio RL1 of 0.1 or more and 0.85 or less is also preferred. The length ratio RL1 can also be 0.2 or more and 0.72 or less. This allows for highly efficient resistance changes and more effectively generates an alternating magnetic field.

[0111] Highly efficient MAMR can also be implemented in the magnetic head 112. According to the implementation method, a magnetic head that can improve recording density can be provided.

[0112] In one example of the magnetic head 112, the thickness t41 of the first non-magnetic layer is, for example, 2 nm or more and 8 nm or less. The thickness t42 of the second non-magnetic layer is, for example, 1 nm or more and 8 nm or less. The thickness t43 of the third non-magnetic layer is, for example, 1 nm or more and 8 nm or less.

[0113] like Figure 10As shown in (b), in one example of the magnetic head 112, the current ic has a direction from the second magnetic layer 22 toward the first magnetic layer 21. The electron flow je has a direction from the first magnetic layer 21 toward the second magnetic layer 22. In another example of the magnetic head 112, the current ic may also have a direction from the first magnetic layer 21 toward the second magnetic layer 22.

[0114] In the magnetic head 112, for example, the first magnetic layer 21 can oscillate. The second magnetic layer 22 can oscillate.

[0115] When a current ic flows in the magnetic head 111 and magnetic head 112, for example, also in the laminate 20, an alternating magnetic field Ha1 is generated from the laminate 20, and an alternating electric current Pa1 is generated in the laminate 20. For example, the absolute value of the difference between the first frequency of the alternating magnetic field Ha1 and the second frequency of the alternating electric current Pa1 is less than 0.25 times the first frequency.

[0116] In magnetic heads 111 and 112, the structure described with respect to magnetic head 110 can be applied. For example, the third length L3 (refer to...) Figure 1 (a) is longer than the second length L2. For example, the third width w3 (refer to...) Figure 1 (b) is wider than the second width w2.

[0117] The structures described for heads 110a, 110b, and 110c can be applied to heads 111 and 112.

[0118] Hereinafter, examples of the magnetic head and magnetic recording medium 80 included in the magnetic recording apparatus 210 according to the embodiments will be described.

[0119] Figure 11 This is a schematic perspective view illustrating the magnetic recording apparatus according to an exemplary embodiment.

[0120] like Figure 11 As shown, the magnetic head (e.g., magnetic head 110) involved in the embodiment is used with the magnetic recording medium 80. In this example, the magnetic head 110 includes a recording section 60 and a playback section 70. Information is recorded in the magnetic recording medium 80 through the recording section 60 of the magnetic head 110. The information recorded in the magnetic recording medium 80 is reproduced through the playback section 70.

[0121] The magnetic recording medium 80 includes, for example, a medium substrate 82 and a magnetic recording layer 81 disposed on the medium substrate 82. The magnetization 83 of the magnetic recording layer 81 is controlled by the recording unit 60.

[0122] The reproduction unit 70 includes, for example, a first reproduction magnetic shield 72a, a second reproduction magnetic shield 72b, and a magnetic reproduction element 71. The magnetic reproduction element 71 is disposed between the first reproduction magnetic shield 72a and the second reproduction magnetic shield 72b. The magnetic reproduction element 71 is capable of outputting a signal corresponding to the magnetization 83 of the magnetic recording layer 81.

[0123] like Figure 11 As shown, the magnetic recording medium 80 moves relative to the magnetic head 110 in the medium movement direction 85. At any position, the magnetic head 110 controls the information corresponding to the magnetization 83 of the magnetic recording layer 81. At any position, the magnetic head 110 reproduces the information corresponding to the magnetization 83 of the magnetic recording layer 81.

[0124] Figure 12 This is a schematic perspective view illustrating a portion of a magnetic recording apparatus according to an exemplary embodiment.

[0125] Figure 12 An example of a head slider is shown.

[0126] The magnetic head 110 is disposed on the head slider 159. The head slider 159 may contain, for example, Al2O3 / TiC. The head slider 159 moves relative to the magnetic recording medium while suspending on or in contact with the magnetic recording medium.

[0127] The head slider 159 has, for example, an air inlet side 159A and an air outlet side 159B. The magnetic head 110 is disposed on the side of the air outlet side 159B of the head slider 159. Thus, the magnetic head 110 moves relative to the magnetic recording medium while suspending on or in contact with the magnetic recording medium.

[0128] Figure 13 This is a schematic perspective view illustrating the magnetic recording apparatus according to an exemplary embodiment.

[0129] like Figure 13 As shown, a rotary actuator is used in the magnetic recording apparatus 150 according to this embodiment. A recording media disk 180 is mounted on a spindle motor 180M. The recording media disk 180 rotates in the direction of arrow AR via the spindle motor 180M. The spindle motor 180M responds to control signals from the drive unit control unit. The magnetic recording apparatus 150 according to this embodiment may also include multiple recording media disks 180. The magnetic recording apparatus 150 may also include a recording medium 181. The recording medium 181 is, for example, an SSD (Solid State Drive). For example, a non-volatile memory such as flash memory is used for the recording medium 181. For example, the magnetic recording apparatus 150 may also be a hybrid HDD (Hard Disk Drive).

[0130] The head slider 159 records and reproduces information recorded on the recording medium disk 180. The head slider 159 is disposed at the front end of the thin-film suspension 154. The magnetic head according to the embodiment is disposed near the front end of the head slider 159.

[0131] When the recording media disk 180 rotates, the pressing pressure generated by the suspension 154 and the pressure generated on the media-facing surface (ABS) of the head slider 159 are balanced. The distance between the media-facing surface of the head slider 159 and the surface of the recording media disk 180 is a predetermined suspension amount. In an embodiment, the head slider 159 may also be in contact with the recording media disk 180. For example, a contact-moving type may also be used.

[0132] Suspension 154 is connected to one end of arm 155 (e.g., actuator arm). 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 arm 155. Voice coil motor 156 is a type of linear motor. Voice coil motor 156 includes, for example, a drive coil and a magnetic circuit. The drive coil is wound around the bobbin portion of arm 155. The magnetic circuit includes a permanent magnet and a counter yoke. The drive coil is disposed between the permanent magnet and the counter yoke. Suspension 154 has one end and another end. A magnetic head is provided at one end of suspension 154. Arm 155 is connected to the other end of suspension 154.

[0133] The arm 155 is held in place by ball bearings. Ball bearings are located at both the upper and lower parts of the bearing section 157. The arm 155 can rotate and slide via the voice coil motor 156. The magnetic head can be moved to any position on the recording media disk 180.

[0134] Figure 14 (a) and Figure 14 (b) is a schematic perspective view of a portion of the magnetic recording apparatus according to an exemplary embodiment.

[0135] Figure 14 (a) illustrates a portion of the structure of the magnetic recording device and is an enlarged perspective view of the head stack assembly 160. Figure 14 (b) is a perspective view of a head assembly (head gimbal assembly: HGA) 158 that is part of a head stack assembly 160.

[0136] like Figure 14 As shown in (a), the head stack assembly 160 includes a bearing portion 157, a head universal joint assembly 158, and a support frame 161. The head universal joint assembly 158 extends from the bearing portion 157. The support frame 161 extends in the opposite direction to the head universal joint assembly 158. The support frame 161 supports the coil 162 of the voice coil motor 156.

[0137] like Figure 14 As shown in (b), the head universal joint assembly 158 has an arm 155 extending from the bearing portion 157 and a suspension 154 extending from the arm 155.

[0138] A head slider 159 is provided at the front end of the suspension 154. A magnetic head according to the embodiment is provided on the head slider 159.

[0139] The head assembly (head gimbal assembly) 158 according to the embodiment includes the head according to the embodiment, a head slider 159 on which the head is disposed, a suspension 154, and an arm 155. The head slider 159 is disposed at one end of the suspension 154. The arm 155 is connected to the other end of the suspension 154.

[0140] Suspension 154 may have, for example, leads (not shown) for recording and reproducing signals. Suspension 154 may also have, for example, leads (not shown) for a heater for adjusting suspension. Suspension 154 may also have, for example, leads (not shown) for a spin-torque oscillator, etc. These leads are electrically connected to multiple electrodes disposed on the magnetic head.

[0141] A signal processing unit 190 is provided in the magnetic recording apparatus 150. The signal processing unit 190 uses a magnetic head to record and reproduce signals from the magnetic recording medium. The input and output lines of the signal processing unit 190 are connected to the electrode pads of the head gimbal assembly 158, for example, and are electrically connected to the magnetic head.

[0142] The magnetic recording apparatus 150 according to the embodiment includes a magnetic recording medium, a magnetic head according to the embodiment, a movable part, a position control unit, and a signal processing unit. The movable part can move relative to the magnetic head while the magnetic recording medium is separated from or in contact with the magnetic head. 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 the signal of the magnetic recording medium using the magnetic head.

[0143] For example, the recording media 180 can be used as the magnetic recording medium described above. The movable part described above includes, for example, a head slider 159. The position control part described above includes, for example, a head universal joint assembly 158.

[0144] The implementation methods may also include the following technical solutions.

[0145] (Technical Solution 1)

[0146] A magnetic head having:

[0147] The first magnetic pole includes a first surface and a second surface intersecting the first surface, the second surface including a region of the first surface that is continuous with the first surface;

[0148] A second magnetic pole, the second magnetic pole including a third surface and a fourth surface intersecting the third surface, the fourth surface including a region of the second surface, the second surface region being continuous with the third surface, the direction from the first surface region toward the second surface region being along a first direction, the first surface region and the second surface region being along a second direction and a third direction, the third direction intersecting a plane including the first direction and the second direction, the first surface and the third surface being along the third direction; and

[0149] A laminated body disposed between the first surface region and the second surface region.

[0150] The laminate includes:

[0151] First magnetic layer; and

[0152] A second magnetic layer is disposed between the first magnetic layer and the second surface region.

[0153] The second magnetic layer includes a second magnetic surface layer opposite to the second surface region.

[0154] The width ratio of the second width of the second magnetic layer along the third direction to the first width of the first surface region along the third direction is greater than 0.25 and less than 0.92.

[0155] (Technical Solution 2)

[0156] The magnetic head according to technical solution 1

[0157] The width ratio is 0.4 or higher and 0.85 or lower.

[0158] (Technical Solution 3)

[0159] The magnetic head according to technical solution 1 or technical solution 2

[0160] The second surface also includes the third surface region.

[0161] The first surface region is located between the first surface and the third surface region.

[0162] The third surface region runs along the second direction and the third direction.

[0163] The fourth surface also includes a fourth surface region and a fifth surface region.

[0164] From the third surface region toward the fourth surface region along the first direction,

[0165] The fourth surface region runs along the second direction and the third direction.

[0166] The first distance along the first direction between the first surface region and the second surface region is shorter than the second distance along the first direction between the third surface region and the fourth surface region.

[0167] The fifth surface region is located between the second surface region and the fourth surface region.

[0168] The plane containing the fifth surface region intersects with the plane containing the third surface region and the plane containing the fourth surface region.

[0169] The second magnetic pole has an intersection position between the plane containing the fifth surface region and the plane containing the fourth surface region, and a first length along the second direction between the third surface.

[0170] The length ratio of the second length of the second magnetic layer along the second direction to the first length is greater than 0.1 and less than 0.85.

[0171] (Technical Solution 4)

[0172] The magnetic head according to technical solution 3

[0173] The length ratio is greater than 0.2 and less than 0.72.

[0174] (Technical Solution 5)

[0175] The magnetic head according to any one of technical solutions 1 to 4

[0176] The second direction is inclined relative to the first direction.

[0177] (Technical Solution 6)

[0178] A magnetic head having:

[0179] The first magnetic pole includes a first surface and a second surface intersecting the first surface, the second surface including a region of the first surface that is continuous with the first surface;

[0180] A second magnetic pole, the second magnetic pole including a third surface and a fourth surface intersecting the third surface, the fourth surface including a region of the second surface, the second surface region being continuous with the third surface, the direction from the first surface region toward the second surface region being along a first direction, the first surface region and the second surface region being along a second direction and a third direction, the third direction intersecting a plane including the first direction and the second direction, the first surface and the third surface being along the third direction; and

[0181] A laminated body disposed between the first surface region and the second surface region.

[0182] The laminate includes:

[0183] First magnetic layer; and

[0184] A second magnetic layer is disposed between the first magnetic layer and the second surface region.

[0185] The second magnetic layer includes a second magnetic surface layer opposite to the second surface region.

[0186] The second surface also includes the third surface region.

[0187] The first surface region is located between the first surface and the third surface region.

[0188] The third surface region runs along the second direction and the third direction.

[0189] The fourth surface also includes a fourth surface region and a fifth surface region.

[0190] From the third surface region toward the fourth surface region along the first direction,

[0191] The fourth surface region runs along the second direction and the third direction.

[0192] The first distance along the first direction between the first surface region and the second surface region is shorter than the second distance along the first direction between the third surface region and the fourth surface region.

[0193] The fifth surface region is located between the second surface region and the fourth surface region.

[0194] The plane containing the fifth surface region intersects with the plane containing the third surface region and the plane containing the fourth surface region.

[0195] The second magnetic pole has an intersection position between the plane containing the fifth surface region and the plane containing the fourth surface region, and a first length along the second direction between the third surface.

[0196] The length ratio of the second length of the second magnetic layer along the second direction to the first length is greater than 0.1 and less than 0.85.

[0197] (Technical Solution 7)

[0198] The magnetic head according to technical solution 6

[0199] The length ratio is greater than 0.2 and less than 0.72.

[0200] (Technical Solution 8)

[0201] The magnetic head according to technical solution 6

[0202] The second direction is inclined relative to the first direction.

[0203] (Technical Solution 9)

[0204] The magnetic head according to any one of technical solutions 1 to 8

[0205] The laminate also includes a first non-magnetic layer disposed between the first magnetic layer and the second magnetic layer.

[0206] (Technical Solution 10)

[0207] The magnetic head according to technical solution 9

[0208] The laminate also includes a second non-magnetic layer disposed between the first magnetic pole and the first magnetic layer.

[0209] (Technical Solution 11)

[0210] The magnetic head according to technical solution 10

[0211] The laminate also includes a third non-magnetic layer disposed between the second magnetic layer and the second magnetic pole.

[0212] (Technical Solution 12)

[0213] The magnetic head according to any one of technical solutions 1 to 8

[0214] The laminated body further includes:

[0215] A third magnetic layer is disposed between the first magnetic pole and the first magnetic layer;

[0216] A fourth magnetic layer is disposed between the first magnetic layer and the second magnetic layer;

[0217] A first non-magnetic layer is disposed between the first magnetic pole and the third magnetic layer;

[0218] A second non-magnetic layer is disposed between the third magnetic layer and the first magnetic layer;

[0219] A third non-magnetic layer is disposed between the first magnetic layer and the fourth magnetic layer;

[0220] A fourth non-magnetic layer is disposed between the fourth magnetic layer and the second magnetic layer; and

[0221] A fifth non-magnetic layer is disposed between the second magnetic layer and the second magnetic pole.

[0222] The first thickness of the first magnetic layer along the first direction is thicker than the third thickness of the third magnetic layer along the first direction.

[0223] The second thickness of the second magnetic layer along the first direction is thicker than the fourth thickness of the fourth magnetic layer along the first direction.

[0224] (Technical Solution 13)

[0225] The magnetic head according to technical solution 12

[0226] The first non-magnetic layer comprises at least one selected from Ru, Ir, Ta, Rh, Pd, Pt, and W.

[0227] The second non-magnetic layer comprises at least one selected from Cu, Au, Cr, Al, V, and Ag.

[0228] The fifth non-magnetic layer comprises at least one material selected from Cu, Au, Cr, Al, V, and Ag.

[0229] The third nonmagnetic layer comprises at least one selected from Cu, Au, Cr, Al, V, and Ag, and the fourth nonmagnetic layer comprises at least one selected from Ru, Ir, Ta, Rh, Pd, Pt, and W; or, the third nonmagnetic layer comprises at least one selected from Ru, Ir, Ta, Rh, Pd, Pt, and W, and the fourth nonmagnetic layer comprises at least one selected from Cu, Au, Cr, Al, V, and Ag.

[0230] (Technical Solution 14)

[0231] The magnetic head according to any one of technical solutions 1 to 8

[0232] The laminated body further includes:

[0233] A third magnetic layer is disposed between the first magnetic layer and the second magnetic layer;

[0234] A fourth magnetic layer is disposed between the second magnetic layer and the second magnetic pole;

[0235] A first non-magnetic layer is disposed between the first magnetic pole and the first magnetic layer;

[0236] A second non-magnetic layer is disposed between the first magnetic layer and the third magnetic layer;

[0237] A third non-magnetic layer is disposed between the third magnetic layer and the second magnetic layer;

[0238] A fourth non-magnetic layer is disposed between the second magnetic layer and the fourth magnetic layer; and

[0239] A fifth non-magnetic layer is disposed between the fourth magnetic layer and the second magnetic pole.

[0240] The first thickness of the first magnetic layer along the first direction is thicker than the third thickness of the third magnetic layer along the first direction.

[0241] The second thickness of the second magnetic layer along the first direction is thicker than the fourth thickness of the fourth magnetic layer along the first direction.

[0242] (Technical Solution 15)

[0243] The magnetic head according to technical solution 14

[0244] The first non-magnetic layer comprises at least one selected from Cu, Au, Cr, Al, V, and Ag.

[0245] The fourth non-magnetic layer comprises at least one material selected from Cu, Au, Cr, Al, V, and Ag.

[0246] The fifth non-magnetic layer comprises at least one selected from Ru, Ir, Ta, Rh, Pd, Pt, and W.

[0247] The second nonmagnetic layer comprises at least one selected from Ru, Ir, Ta, Rh, Pd, Pt, and W, and the third nonmagnetic layer comprises at least one selected from Cu, Au, Cr, Al, V, and Ag; or, the second nonmagnetic layer comprises at least one selected from Cu, Au, Cr, Al, V, and Ag, and the third nonmagnetic layer comprises at least one selected from Ru, Ir, Ta, Rh, Pd, Pt, and W.

[0248] (Technical Solution 16)

[0249] The magnetic head according to any one of technical solutions 12 to 15,

[0250] When an electric current flows through the laminate, an alternating magnetic field is generated from the laminate, thus generating alternating electric current.

[0251] The absolute value of the difference between the first frequency of the alternating magnetic field and the second frequency of the alternating electric power is less than 0.25 times the first frequency.

[0252] (Technical Solution 17)

[0253] The magnetic head according to technical solution 16

[0254] The first thickness is thicker than the second thickness.

[0255] At least a portion of the alternating current is generated in the second magnetic layer.

[0256] At least a portion of the alternating magnetic field is generated from the first magnetic layer.

[0257] (Technical Solution 18)

[0258] A magnetic recording device comprising:

[0259] A magnetic head, comprising a first magnetic pole, a second magnetic pole, and a laminate disposed between the first magnetic pole and the second magnetic pole; and

[0260] Electronic circuitry that supplies current to the laminate.

[0261] The laminate includes:

[0262] First magnetic layer; and

[0263] A second magnetic layer is disposed between the first magnetic layer and the second magnetic pole.

[0264] When the current flows in the laminate, alternating power is generated in the laminate.

[0265] (Technical Solution 19)

[0266] According to the magnetic recording device of technical solution 18

[0267] When the current flows through the laminate, an alternating magnetic field is generated from the laminate.

[0268] The absolute value of the difference between the first frequency of the alternating magnetic field and the second frequency of the alternating electric power is less than 0.25 times the first frequency.

[0269] (Technical Solution 20)

[0270] The magnetic recording device according to technical solution 19

[0271] The first frequency is above 15 GHz and below 50 GHz.

[0272] According to the embodiments, it is possible to provide a magnetic head and a magnetic recording device that can improve recording density.

[0273] In this application specification, "perpendicular" and "parallel" are not just strictly perpendicular and strictly parallel, but also include deviations in manufacturing processes, etc., as long as they are substantially perpendicular and substantially parallel.

[0274] 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, any specific structure of the magnetic poles, laminates, magnetic layers, non-magnetic layers, and wiring included in the magnetic head, as long as it can be appropriately selected by those skilled in the art from the well-known range to similarly implement the present invention and obtain the same effect, is included within the scope of the present invention.

[0275] Furthermore, any technical solution obtained by combining any two or more elements of various specific examples within the scope of technical feasibility, as long as it contains the spirit of the present invention, is also included within the scope of the present invention.

[0276] Furthermore, all magnetic heads and magnetic recording devices that can be implemented by those skilled in the art based on the magnetic heads and magnetic recording devices described above as embodiments of the present invention, provided they contain the spirit of the present invention, are also within the scope of the present invention.

[0277] Furthermore, it should be understood that within the scope of the present invention, those skilled in the art can conceive of various modifications and alterations, which also fall within the scope of the present invention.

[0278] Several embodiments of the present invention have been described above, but these embodiments are merely illustrative and not intended to limit the scope of the invention. These new embodiments can be implemented in a wide variety of other ways, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and / or variations thereof are included within the scope and spirit of the invention, and are included within the scope of the invention as described in the claims and its equivalents.

Claims

1. A magnetic head, comprising: A first magnetic pole includes a first surface and a second surface intersecting the first surface, the second surface including a region of the first surface that is continuous with the first surface; The second magnetic pole includes a third surface and a fourth surface intersecting the third surface. The fourth surface includes a region of the second surface, which is continuous with the third surface. A direction from the first surface region toward the second surface region is along a first direction. The first surface region and the second surface region are along a second direction and a third direction. The third direction intersects a plane that includes the first direction and the second direction. The first surface and the third surface are along the third direction. as well as A laminated body disposed between the first surface region and the second surface region. The laminate includes: First magnetic layer; A second magnetic layer is disposed between the first magnetic layer and the second surface region; A third magnetic layer is disposed between the first magnetic pole and the first magnetic layer; A fourth magnetic layer is disposed between the first magnetic layer and the second magnetic layer; A first non-magnetic layer is disposed between the first magnetic pole and the third magnetic layer; A second non-magnetic layer is disposed between the third magnetic layer and the first magnetic layer; A third non-magnetic layer is disposed between the first magnetic layer and the fourth magnetic layer; A fourth non-magnetic layer is disposed between the fourth magnetic layer and the second magnetic layer; and A fifth non-magnetic layer is disposed between the second magnetic layer and the second magnetic pole. The second magnetic layer includes a second magnetic surface layer opposite to the second surface region. The width ratio of the second width of the second magnetic layer along the third direction to the first width of the first surface region along the third direction is greater than 0.25 and less than 0.

92.

2. The magnetic head according to claim 1, The second surface also includes the third surface region. The first surface region is located between the first surface and the third surface region. The third surface region runs along the second direction and the third direction. The fourth surface also includes a fourth surface region and a fifth surface region. From the third surface region toward the fourth surface region along the first direction, The fourth surface region runs along the second direction and the third direction. The first distance along the first direction between the first surface region and the second surface region is shorter than the second distance along the first direction between the third surface region and the fourth surface region. The fifth surface region is located between the second surface region and the fourth surface region. The plane containing the fifth surface region intersects with the plane containing the third surface region and the plane containing the fourth surface region. The second magnetic pole has the intersection of the plane containing the fifth surface region and the plane containing the fourth surface region, and a first length along the second direction between the third surface. The length ratio of the second length of the second magnetic layer along the second direction to the first length is greater than 0.1 and less than 0.

85.

3. The magnetic head according to claim 1, The first thickness of the first magnetic layer along the first direction is thicker than the third thickness of the third magnetic layer along the first direction. The second thickness of the second magnetic layer along the first direction is thicker than the fourth thickness of the fourth magnetic layer along the first direction.

4. The magnetic head according to claim 3, The first non-magnetic layer comprises at least one selected from Ru, Ir, Ta, Rh, Pd, Pt, and W. The second non-magnetic layer comprises at least one selected from Cu, Au, Cr, Al, V, and Ag. The fifth non-magnetic layer comprises at least one material selected from Cu, Au, Cr, Al, V, and Ag. The third nonmagnetic layer comprises at least one selected from Cu, Au, Cr, Al, V, and Ag, and the fourth nonmagnetic layer comprises at least one selected from Ru, Ir, Ta, Rh, Pd, Pt, and W; or, the third nonmagnetic layer comprises at least one selected from Ru, Ir, Ta, Rh, Pd, Pt, and W, and the fourth nonmagnetic layer comprises at least one selected from Cu, Au, Cr, Al, V, and Ag.

5. The magnetic head according to claim 1, When an electric current flows through the laminate, an alternating magnetic field is generated from the laminate, thus generating alternating electric current. The absolute value of the difference between the first frequency of the alternating magnetic field and the second frequency of the alternating electric power is less than 0.25 times the first frequency.

6. A magnetic head, comprising: A first magnetic pole includes a first surface and a second surface intersecting the first surface, the second surface including a region of the first surface that is continuous with the first surface; The second magnetic pole includes a third surface and a fourth surface intersecting the third surface. The fourth surface includes a region of the second surface, which is continuous with the third surface. A direction from the first surface region toward the second surface region is along a first direction. The first surface region and the second surface region are along a second direction and a third direction. The third direction intersects a plane that includes the first direction and the second direction. The first surface and the third surface are along the third direction. as well as A laminated body disposed between the first surface region and the second surface region. The laminate includes: First magnetic layer; A second magnetic layer is disposed between the first magnetic layer and the second surface region; A third magnetic layer is disposed between the first magnetic pole and the first magnetic layer; A fourth magnetic layer is disposed between the first magnetic layer and the second magnetic layer; A first non-magnetic layer is disposed between the first magnetic pole and the third magnetic layer; A second non-magnetic layer is disposed between the third magnetic layer and the first magnetic layer; A third non-magnetic layer is disposed between the first magnetic layer and the fourth magnetic layer; A fourth non-magnetic layer is disposed between the fourth magnetic layer and the second magnetic layer; and A fifth non-magnetic layer is disposed between the second magnetic layer and the second magnetic pole. The second magnetic layer includes a second magnetic surface layer opposite to the second surface region. The second surface also includes the third surface region. The first surface region is located between the first surface and the third surface region. The third surface region runs along the second direction and the third direction. The fourth surface also includes a fourth surface region and a fifth surface region. From the third surface region toward the fourth surface region along the first direction, The fourth surface region runs along the second direction and the third direction. The first distance along the first direction between the first surface region and the second surface region is shorter than the second distance along the first direction between the third surface region and the fourth surface region. The fifth surface region is located between the second surface region and the fourth surface region. The plane containing the fifth surface region intersects with the plane containing the third surface region and the plane containing the fourth surface region. The second magnetic pole has the intersection of the plane containing the fifth surface region and the plane containing the fourth surface region, and a first length along the second direction between the third surface. The length ratio of the second length of the second magnetic layer along the second direction to the first length is greater than 0.1 and less than 0.

85.

7. A magnetic recording device, comprising: The magnetic head according to any one of claims 1 to 6; and Electronic circuitry that supplies current to the laminate. When the current flows in the laminate, alternating power is generated in the laminate.

8. The magnetic recording apparatus according to claim 7, When the current flows through the laminate, an alternating magnetic field is generated from the laminate. The absolute value of the difference between the first frequency of the alternating magnetic field and the second frequency of the alternating electric power is less than 0.25 times the first frequency.

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