Magnetic head and magnetic recording device

Abstract

A magnetic head and a magnetic recording device capable of stable operation are provided. According to an embodiment, the magnetic head includes a first magnetic pole, a second magnetic pole, and a laminate. The laminate includes a first magnetic component, a second magnetic component disposed between the first magnetic component and the second magnetic pole, and a first layer disposed between the first magnetic component and the second magnetic component and including at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc. The first magnetic component includes a plurality of first magnetic regions and a first non-magnetic region. The first non-magnetic region includes at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc. The plurality of first magnetic regions include at least one selected from the group consisting of Fe, Co, and Ni. The thickness of the first layer along the first direction is thicker than the thickness of the first non-magnetic region along the first direction.

Description

[0001] This application is based on Japanese Patent Application No. 2020-192364 (filing date November 19, 2020), and claims the benefit of priority from the aforementioned application. The present application incorporates all the contents of the aforementioned application by reference. Technical Field

[0002] Embodiments of the present invention generally relate to a magnetic head and a magnetic recording device. Background Art

[0003] A magnetic recording device includes a magnetic head using a laminated body including a magnetic layer. A stable operation is desired in a magnetic recording device. Summary of the invention

[0004] Embodiments of the present invention provide a magnetic head and a magnetic recording device capable of performing stable operations.

[0005] Means for solving problems

[0006] According to an embodiment of the present invention, a magnetic head includes a first magnetic pole, a second magnetic pole, and a stacked body disposed between the first magnetic pole and the second magnetic pole. The stacked body includes a first magnetic component, a second magnetic component disposed between the first magnetic component and the second magnetic pole, and a first layer disposed between the first magnetic component and the second magnetic component and including at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc. The first magnetic component includes a plurality of first magnetic regions and a first non-magnetic region. A direction from one of the plurality of first magnetic regions to another one of the plurality of first magnetic regions is along a first direction from the first magnetic pole to the second magnetic pole. The first non-magnetic region is between the one of the plurality of first magnetic regions and the other one of the plurality of first magnetic regions. The first non-magnetic region includes at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc. The plurality of first magnetic regions include at least one selected from the group consisting of Fe, Co, and Ni. A first layer thickness of the first layer along the first direction is thicker than a first nonmagnetic region thickness of the first nonmagnetic region along the first direction.

[0007] According to the magnetic head having the above-described structure, it is possible to provide a magnetic head and a magnetic recording device capable of performing stable operations. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0009] Figure 2 is a schematic cross-sectional view of a magnetic recording device according to an exemplary embodiment.

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

[0011] Figure 4 This is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment.

[0012] Figure 5 This is a schematic cross-sectional view illustrating a part of the magnetic head according to the first embodiment.

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

[0014] Figure 7 This is a schematic cross-sectional view illustrating a part of the magnetic head according to the first embodiment.

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

[0016] Fig. 9 1 is a schematic perspective view of a magnetic head according to an exemplary embodiment.

[0017] Fig.10 It is a schematic perspective view of a part of the magnetic recording device according to the embodiment.

[0018] Fig.11 It is a schematic perspective view of a magnetic recording device according to an exemplary embodiment.

[0019] Fig.12 (a) and Fig.12 (b) is a schematic perspective view of a part of the magnetic recording device according to the embodiment.

[0020] Description of symbols

[0021] 20…laminated body, 20D…circuit, 21-23…first to third magnetic components, 21M, 22M, 23M…first, second, third magnetic regions, 21N, 22N, 23N…first, second, third non-magnetic regions, 25b…second magnetic pole side magnetic layer, 30D…recording circuit, 30F…magnetic pole surface, 30c…coil, 30i…insulating portion, 31…first magnetic pole, 32…second magnetic pole , 33...shield, 41-44...1st to 4th layers, 60...recording unit, 70...reproducing unit, 71...magnetic reproducing element, 72a, 72b...1st and 2nd reproducing shields, 80...magnetic recording medium, 81...magnetic recording layer, 82...medium substrate, 83...magnetization, 85...medium moving direction, θ1...angle, 110...magnetic head, 150...magnetic recording device, 154...suspension, 155...arm, 1 56…voice coil motor, 157…bearing part, 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 part, 210…magnetic recording device, AR…arrow, C1, C2…first and second coil terminals, D1…direction, Id…current, Iw…recording current, RMR…MR ratio, T1, T2…first and second terminals, W1, W2…first and second wirings, je…electron flow, t41…first layer thickness, tM1, tM2, tM3…first, second and third magnetic region thicknesses, tN1, tN2, tN3…first, second and third non-magnetic region thicknesses. DETAILED DESCRIPTION

[0022] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0023] The drawings are schematic or conceptual, and the relationship between the thickness and width of each part, the ratio of the size between parts, etc. are not necessarily the same as in reality. Even when the same part is shown, there are cases where the size and ratio are different from each other depending on the drawings.

[0024] In the present specification and each drawing, the same elements as those described previously with respect to an already-appeared drawing are denoted by the same reference numerals, and detailed description thereof will be appropriately omitted.

[0025] (First embodiment)

[0026] Figure 1 (a) and Figure 1 (b) is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment.

[0027] Figure 2 is a schematic cross-sectional view of a magnetic recording device according to an exemplary embodiment.

[0028] like Figure 2 As shown, the magnetic recording device 210 of the first embodiment includes a magnetic head 110 and a circuit 20D. For example, the magnetic head 110 is provided with a recording unit 60. As described later, the magnetic head 110 may also include a reproducing unit.

[0029] The magnetic recording device 210 may include a magnetic recording medium 80. Information is recorded on the magnetic recording medium 80 by the recording unit 60 of the magnetic head 110. The magnetic recording medium 80 is, for example, a perpendicular recording medium. An example of the magnetic recording medium 80 will be described later.

[0030] like Figure 1 As shown, the magnetic head 110 includes a first magnetic pole 31, a second magnetic pole 32 and a stacked body 20. The stacked body 20 is disposed between the first magnetic pole 31 and the second magnetic pole 32. The first magnetic pole 31 is, for example, a main magnetic pole. The second magnetic pole 32 is, for example, a trailing shield. In an embodiment, the second magnetic pole 32 may be a main magnetic pole and the first magnetic pole 31 may be a trailing shield. In the following, it is assumed that the first magnetic pole 31 is a main magnetic pole and the second magnetic pole 32 is a trailing shield.

[0031] The first magnetic pole 31 and the second magnetic pole 32 form a magnetic circuit, for example. For example, a coil 30c is provided at the first magnetic pole 31. For example, via the first coil terminal C1 and the second coil terminal C2, for example, a recording circuit 30D is electrically connected to the coil 30c. A recording current Iw is supplied to the coil 30c from the recording circuit 30D. For example, a recording magnetic field corresponding to the recording current Iw flowing to the coil 30c is generated from the first magnetic pole 31. At least a portion of the generated recording magnetic field goes to the magnetic recording medium 80. At least a portion of the recording magnetic field is applied to the magnetic recording medium 80. The direction of magnetization of the portion of the magnetic recording medium 80 to which the recording magnetic field is applied is controlled by the recording magnetic field. Thus, information corresponding to the direction of the recording magnetic field is recorded on the magnetic recording medium 80. For example, after at least a portion of the recording magnetic field goes to the magnetic recording medium 80, it goes to the second magnetic pole 32.

[0032] The direction D1 from the first magnetic pole 31 to the second magnetic pole 32 is, for example, along the X-axis direction. A direction perpendicular to the X-axis direction is defined as the Z-axis direction. A direction perpendicular to the X-axis direction and the Z-axis direction is defined as the Y-axis direction.

[0033] The current Id can be supplied to the stacked body 20. For example, as described later, the current Id is supplied to the stacked body 20 via the first magnetic pole 31 and the second magnetic pole 32.

[0034] In one example, the magnetization direction of the magnetic layer included in the stack 20 is reversed by the current Id. Thus, the recording magnetic field is efficiently applied to the magnetic recording medium 80. In another example, the magnetization of the magnetic layer included in the stack 20 is oscillated by the current Id. Thus, for example, MAMR (Microwave Assisted Magnetic Recording) is implemented.

[0035] like Figure 1 As shown in (a), for example, when a current Id having a direction from the second magnetic component 22 to the first magnetic component 21 flows through the stack 20, the direction of magnetization of the magnetic layer included in the stack 20 is reversed. For example, when a current Id having a direction from the second magnetic component 22 to the first magnetic component 21 flows through the stack 20, an alternating magnetic field is emitted from the stack 20. For example, when an electron current je having a direction from the first magnetic component 21 to the second magnetic component 22 flows through the stack 20, the direction of magnetization of the magnetic layer included in the stack 20 is reversed. For example, when an electron current je having a direction from the first magnetic component 21 to the second magnetic component 22 flows through the stack 20, an alternating magnetic field is emitted from the stack 20.

[0036] like Figure 2 As shown, the first magnetic pole 31 includes a magnetic pole surface 30F. The magnetic pole surface 30F is, for example, a medium-facing surface. The magnetic pole surface 30F is, for example, an ABS (Air Bearing Surface). The magnetic pole surface 30F faces, for example, the magnetic recording medium 80 .

[0037] For example, the direction perpendicular to the magnetic pole surface 30F corresponds to the Z-axis direction. The Z-axis direction is, for example, the height direction. The X-axis direction is, for example, the along-track direction. The Y-axis direction is, for example, the through-track direction.

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

[0039] like Figure 2 As shown, a shield 33 may be provided in the recording section 60. The first magnetic pole 31 is provided between the shield 33 and the second magnetic pole 32. An insulating portion 30i is provided around the shield 33, the first magnetic pole 31, and the second magnetic pole 32.

[0040] like Figure 1 As shown in (a), in the magnetic head 110, the laminate 20 includes a first magnetic member 21, a second magnetic member 22, and a first layer 41. The second magnetic member 22 is provided between the first magnetic member 21 and the second magnetic pole 32. As described later, other layers such as the second layer 42 may be provided in the laminate 20.

[0041] The first layer 41 is provided between the first magnetic component 21 and the second magnetic component 22. The first layer 41 includes at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc. The element included in the first layer 41 (including at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc) is set as the first element. The first layer 41 is, for example, a Cr layer. The first layer 41 is a non-magnetic layer.

[0042] The direction from the first magnetic member 21 to the second magnetic member 22 is referred to as the first direction. The first direction is referred to as the X-axis direction. The first direction is, for example, along Figure 2 The illustrated direction D1. The first direction (X-axis direction) corresponds to, for example, the stacking direction. The first layer 41 is substantially along the XY plane.

[0043] like Figure 1 As shown in (b), the first magnetic member 21 includes a plurality of first magnetic regions 21M and a first non-magnetic region 21N. The direction from one of the plurality of first magnetic regions 21M to another of the plurality of first magnetic regions 21M is along a first direction from the first magnetic pole 31 to the second magnetic pole 32. The first direction may be substantially the X-axis direction, for example.

[0044] The first nonmagnetic region 21N is located between one of the plurality of first magnetic regions 21M and another one of the plurality of first magnetic regions 21M. In this example, a plurality of first nonmagnetic regions 21N are provided. One of the plurality of first magnetic regions 21M is located between one of the plurality of first nonmagnetic regions 21N and another one of the plurality of first nonmagnetic regions 21N.

[0045] The plurality of first non-magnetic regions 21N include at least one selected from the group consisting of Cr, V, Mn, Ti and Sc. The element included in the plurality of first non-magnetic regions 21N (including at least one selected from the group consisting of Cr, V, Mn, Ti and Sc) is set as the second element. The plurality of first non-magnetic regions 21N are, for example, Cr layers. The plurality of first magnetic regions 21M include at least one selected from the group consisting of Fe, Co and Ni. The element included in the plurality of first magnetic regions 21M (including at least one selected from the group consisting of Fe, Co and Ni) is set as the third element. The plurality of first magnetic regions 21M may include, for example, FeCo alloy, FeNi alloy or FeCoNi alloy.

[0046] like Figure 1 As shown in (a), in this example, the laminate 20 includes a second layer 42. The second layer 42 is provided between the second magnetic component 22 and the second magnetic pole 32. The second layer 42 contains Cu. The second layer 42 is, for example, a Cu layer. The second layer 42 is a non-magnetic layer. By providing the second layer 42, for example, by polarized electrons injected from the second magnetic pole 32 side, the magnetization of the second magnetic layer 22 is reversed to the direction opposite to the X-axis component of the magnetization of the second magnetic pole 32.

[0047] like Figure 1 As shown in (a), the laminate 20 includes a second magnetic pole side magnetic layer 25b. The second magnetic pole side magnetic layer 25b is provided between the second layer 42 and the second magnetic pole 32. The second magnetic pole side magnetic layer 25b includes at least one selected from the group consisting of Fe, Co and Ni. The second magnetic pole side magnetic layer 25b may also include the same material as the second magnetic pole 32. In this case, the second magnetic pole side magnetic layer 25b may also be regarded as a part of the second magnetic pole 32. The second layer 42 and the second magnetic pole side magnetic layer 25b are provided as needed, or may be omitted. The thickness (for example, the length along the X-axis direction) of the second magnetic pole side magnetic layer 25b is preferably thin. The thickness of the second magnetic pole side magnetic layer 25b is, for example, not less than 0.15 nm and not more than 3 nm.

[0048] like Figure 1 As shown in (a), the stacked body 20 may also include a third layer 43. The third layer 43 is provided between the first magnetic pole 31 and the first magnetic component 21. The third layer 43, for example, includes at least one selected from the group consisting of Ta, Ru and Cr. The third layer 43 functions as a base layer, for example. By providing the third layer 43, for example, the magnetic coupling between the first magnetic pole 31 and the first magnetic component 21 is easily substantially cut off. The third layer 43 is provided as needed and may also be omitted.

[0049] In the embodiment, in the first magnetic component 21, the first non-magnetic region 21N including the second element (Cr, etc.) is provided between the plurality of first magnetic regions 21M including the third element (Fe, etc.). For example, the plurality of first magnetic regions 21M and the plurality of first non-magnetic regions 21N may be provided alternately. With such a configuration, the first magnetic component 21 can have a stable large negative spin polarization.

[0050] For example, in an alloy containing a third element (Fe, etc.) and a second element (Cr, etc.), a non-solid solution equilibrium state is presented mutually. In this alloy, there is a tendency to separate into a region (such as a particle) containing a third element and a region (such as a particle) containing a second element and mix. When the region (such as a particle) containing a third element (Fe, etc.) is small, negative spin polarization is easily generated. For example, the negative spin polarization at the interface between Fe and Cr is added. As a result, negative spin polarization is easily generated.

[0051] On the other hand, if heat is applied, the spin polarization tends to become positive. Regarding this, it can be considered that the reason is that by applying heat, the region (e.g., particle) containing the third element (Fe, etc.) becomes larger, and then the distance between multiple regions containing the third element becomes longer. For example, by increasing the size of the Fe particle, the positive spin polarization becomes larger. The amount of the interface between Fe and Cr (area per unit volume) decreases, and the negative spin polarization at the interface between Fe and Cr decreases.

[0052] As described above, in an alloy containing a third element (eg, Fe) and a second element (eg, Cr), the polarity of spin polarization changes during heat treatment or the like, and the spin polarization tends to become positive.

[0053] In contrast, in an embodiment, for example, between two first magnetic regions 21M containing a third element (such as Fe, etc.), first non-magnetic regions 21N containing a second element (such as Cr, etc.) are alternately arranged. For example, the first magnetic region 21M is layered, and the first non-magnetic region 21N is also layered. Thus, even if heat treatment is performed, these regions are stable. Mixing of these regions can be suppressed. By making the thickness of the first magnetic region 21M sufficiently thin, negative spin polarization is maintained. The interface between the first magnetic region 21M and the first non-magnetic region 21N is stable and can exist at a high density. By making the thickness of the first non-magnetic region 21N sufficiently thin, the magnetization of adjacent multiple first magnetic regions 21M becomes one. Thus, for example, the first magnetic component 21 can stably have a negative spin polarization. Similarly, the second magnetic component 22 can also stably have a negative spin polarization.

[0054] In the embodiment, such a first magnetic component 21 and a second magnetic component 22 are combined with the first layer 41. If a current Id is supplied to the stack 20, the first magnetic component 21 functions as a spin injection layer, for example. The magnetization of the second magnetic component 22 changes (for example, oscillates). An alternating magnetic field is generated by the magnetization change (oscillation) of the magnetic component included in the stack 20. The alternating magnetic field is, for example, a high-frequency magnetic field. The alternating magnetic field is applied to the magnetic recording medium 80 to implement MAMR.

[0055] In the case where the third layer 43 is not provided or the third layer 43 includes a material that is easy to spin diffuse (for example, a material including at least one selected from the group consisting of Co, Ni, and Fe and Pt, etc.), the magnetization of the first magnetic member 21 is substantially fixed, and the magnetization of the second magnetic member 22 changes. In the case where the third layer 43 is provided and includes a material that is difficult to spin diffuse (for example, at least one selected from the group consisting of Ta, Ru, and Cr, etc.), the magnetization of the first magnetic member 21 and the magnetization of the second magnetic member 22 change. For example, the recording magnetic field is efficiently applied to the magnetic recording medium 80.

[0056] The first magnetic component 21 is, for example, a negative spin injection layer. In this case, the positive spin injection from the second magnetic pole 32 side and the negative spin injection from the first magnetic component 21 overlap. For example, in the case where the first magnetic component 21 has positive spin polarization, the positive spin injection from the second magnetic pole 32 side and the positive spin injection from the first magnetic component 21 act in a manner that cancels each other out. In an embodiment, by using the first magnetic component 21 as described above, the magnetization of the second magnetic component 22 is effectively changed (e.g., oscillated) and reversed.

[0057] In the embodiment, after heat treatment or the like, the magnetic characteristics of the first magnetic member 21 and the second magnetic member 22 are stabilized, and high heat resistance is obtained. According to the embodiment, a magnetic head capable of stable operation can be provided.

[0058] In the embodiment, for example, the thickness of the first magnetic member 21 is set to a thickness t21 (see Figure 1 (a)). The thickness of the second magnetic member 22 is set to thickness t22 (see Figure 1 (a)). These thicknesses are lengths along the stacking direction (the first direction, for example, the X-axis direction). In the embodiment, the thickness t21 is preferably thinner than the thickness 22. Figure 1 In (a), the thickness t21 is drawn thicker than the thickness t22 for easier viewing. The thickness t21 of the first magnetic member 21 is, for example, 1.5 nm to 4 nm. The thickness t22 of the second magnetic member 22 is, for example, 3 nm to 10 nm.

[0059] like Figure 1 As shown in (a), the thickness of the first layer 41 along the first direction is defined as the first layer thickness t41. Figure 1As shown in (b), the thickness of the first non-magnetic region 21N along the first direction is set to the first non-magnetic region thickness tN1. The first direction is the direction from the first magnetic component 21 to the second magnetic component 22. The first direction is the stacking direction. In an embodiment, the first layer thickness t41 is thicker than the first non-magnetic region thickness tN1. By making the first non-magnetic region thickness tN1 thin, as described above, a negative spin polarization is stably obtained. For example, the first layer thickness t41 exceeds 1 times the first non-magnetic region thickness tN1 and is less than 16.7 times. For example, the first layer thickness t41 is more than 1.2 times and less than 10 times the first non-magnetic region thickness tN1.

[0060] In the embodiment, the first non-magnetic region thickness tN1 is preferably, for example, greater than 0.15 nm and less than 0.8 nm. Negative spin polarization is stably obtained. When the first non-magnetic region thickness tN1 is greater than 0.15 nm, for example, a uniform film can be easily obtained. When the first non-magnetic region thickness tN1 is less than 0.8 nm, for example, the density of the interface can be increased, and a high negative MR ratio can be easily obtained.

[0061] The thickness of one of the plurality of first magnetic regions 21M along the first direction is set to be the first magnetic region thickness tM1. The first magnetic region thickness tM1 is preferably, for example, greater than or equal to 0.15 nm and less than or equal to 0.8 nm. Negative spin polarization is stably obtained. When the first magnetic region thickness tM1 is greater than or equal to 0.15 nm, for example, a uniform film is easily obtained. When the first magnetic region thickness tM1 is less than or equal to 0.8 nm, for example, the density of the interface can be increased, and a high negative MR ratio is easily obtained.

[0062] In the embodiment, the first layer thickness t41 is preferably, for example, not less than 0.8 nm and not more than 2.5 nm. The first layer thickness t41 is more preferably, for example, not less than 0.8 nm and not more than 1.2 nm.

[0063] Hereinafter, an example of the relationship between the first layer thickness t41 and the characteristics will be described.

[0064] Figure 3 It is a graph illustrating the characteristics of the magnetic head.

[0065] exist Figure 3 In the example shown, the second magnetic member 22 includes NiFe. NiFe has positive spin polarization. Figure 1 (a)) magnetic field. Figure 3The horizontal axis is the first layer thickness t41. The vertical axis is the MR ratio RMR. As the first layer thickness t41 decreases from 4nm to 1.1nm, the absolute value of the negative MR ratio RMR increases. The increase in the absolute value of the MR ratio RMR means that the spin torque efficiency is improved. By improving the spin torque efficiency, for example, the magnetization direction of the second magnetic component 22 can be easily changed by a small current.

[0066] On the other hand, in the manufacture of the magnetic head, when the first layer thickness t41 is 4nm, the first layer 41 is difficult to remove during grinding, and it is easy to produce unevenness on the magnetic pole surface 30F (for example, the medium opposite surface). In this case, the head is easily damaged by long-term use. When the first layer thickness t41 is 0.7nm, the MR ratio is substantially 0. Regarding this, it can be considered that the reason is that: when the first layer thickness t41 is 0.7nm, the first magnetic component 21 and the second magnetic component 22 are strongly magnetically coupled to each other, and the magnetization of the second magnetic component 22 does not substantially change.

[0067] Therefore, the first layer thickness t41 is preferably, for example, not less than 0.8 nm and not more than 2.5 nm.

[0068] The first layer thickness t41 is preferably 0.8 nm or more and 1.2 nm or less. For example, RKKY head coupling and parallel magnetic coupling caused by interface irregularities tend to cancel each other out. Thus, magnetic coupling between the first layer 41 and the first magnetic member 21 can be suppressed.

[0069] When the first layer thickness t41 of the first layer 41 including Cr or the like is 2.5 nm or less, for example, polishing becomes easy and the shape can be easily controlled with high precision.

[0070] As already described, the first magnetic component 21 may also include a plurality of first non-magnetic regions 21N. One of the plurality of first magnetic regions 21M is located between one of the plurality of first non-magnetic regions 21N and another one of the plurality of first non-magnetic regions 21N. In an embodiment, the number of the plurality of first magnetic regions 21M (i.e., the number of stacking layers) is greater than or equal to 2 and less than or equal to 20. By making the number of the plurality of first magnetic regions 21M greater than or equal to 2, for example, the effect of increasing the absolute value of the MR ratio RMR achieved by the plurality of interfaces becomes apparent. When the number of the plurality of first magnetic regions 21M is greater than or equal to 20, the effect of increasing the absolute value of the MR ratio RMR becomes smaller. When the number of the plurality of first magnetic regions 21M is greater than or equal to 20, the distance between the two magnetic poles becomes excessively long, and it becomes difficult to increase the recording density.

[0071] In the embodiment, one of the plurality of first nonmagnetic regions 21N may be in contact with the first layer 41 . In another example, one of the plurality of first magnetic regions 21M may be in contact with the first layer 41 .

[0072] Hereinafter, an example of the second magnetic member 22 will be described.

[0073] In one example, the second magnetic member 22 includes at least one selected from the group consisting of Fe, Co, and Ni. The second magnetic member 22 may include, for example, a FeCo alloy, a FeNi alloy, or a FeCoNi alloy.

[0074] Figure 4 This is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment.

[0075] like Figure 4 As shown, in the magnetic head 111 of the embodiment, the second magnetic member 22 has a multi-layer stacked structure. For example, the second magnetic member 22 has a negative spin polarization.

[0076] Figure 5 This is a schematic cross-sectional view illustrating a part of the magnetic head according to the first embodiment.

[0077] Figure 5 FIG. 2 shows an example of the second magnetic component 22 in the magnetic head 111. Figure 5 As shown, in this example, the second magnetic component 22 includes a plurality of second magnetic regions 22M and a second non-magnetic region 22N. The direction from one of the plurality of second magnetic regions 22M to another one of the plurality of second magnetic regions 22M is along the above-mentioned first direction (stacking direction). The second non-magnetic region 22N is between the above-mentioned one of the plurality of second magnetic regions 22M and the above-mentioned other one of the plurality of second magnetic regions 22M. The second non-magnetic region 22N includes at least one selected from the group consisting of Cr, V, Mn, Ti and Sc. The plurality of second magnetic regions 22M includes at least one selected from the group consisting of Fe, Co and Ni. The second magnetic component 22 may also include a plurality of second non-magnetic regions 22N. One of the plurality of second magnetic regions 22M is between one of the plurality of second non-magnetic regions 22N and another one of the plurality of second non-magnetic regions 22N.

[0078] For example, the second nonmagnetic region 22N preferably has a second nonmagnetic region thickness tN2 of 0.15 nm to 0.8 nm. The first magnetic region thickness tM2 of one of the second magnetic regions 22M preferably has a first magnetic region thickness tM2 of 0.15 nm to 0.8 nm.

[0079] Figure 6 This is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment.

[0080] like Figure 6As shown, in the magnetic head 112 of the embodiment, the laminate 20 includes the third magnetic member 23 and the fourth layer 44 in addition to the first magnetic member 21 , the second magnetic member 22 , the first layer 41 , the second layer 42 , the third layer 43 and the second magnetic pole side magnetic layer 25 b .

[0081] The third magnetic member 23 is provided between the first magnetic pole 31 and the first magnetic member 21. The fourth layer 44 is provided between the third magnetic member 23 and the first magnetic member 21. For example, the third magnetic member 23 has a negative spin polarization.

[0082] Figure 7 This is a schematic cross-sectional view illustrating a part of the magnetic head according to the first embodiment.

[0083] like Figure 7 As shown, the third magnetic component 23 includes a plurality of third magnetic regions 23M and a third non-magnetic region 23N. The direction from one of the plurality of third magnetic regions 23M to another one of the plurality of third magnetic regions 23M is along the first direction (e.g., stacking direction). The third non-magnetic region 23N is between the above-mentioned one of the plurality of third magnetic regions 23M and the above-mentioned other one of the plurality of third magnetic regions 23M. The third non-magnetic region 23N includes at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc. The plurality of third magnetic regions 23M includes at least one selected from the group consisting of Fe, Co, and Ni. The third magnetic component 23 may also include a plurality of third non-magnetic regions 23N. One of the plurality of third magnetic regions 23M is between one of the plurality of third non-magnetic regions 23N and another one of the plurality of third non-magnetic regions 23N.

[0084] For example, the third nonmagnetic region 23N preferably has a third nonmagnetic region thickness tN3 along the first direction of 0.15 nm to 0.8 nm. The first magnetic region thickness tM3 along the first direction of one of the third magnetic regions 23M preferably has a first magnetic region thickness tM3 along the first direction of 0.15 nm to 0.8 nm.

[0085] In the embodiment, for example, the thickness of the third magnetic member 23 is set to a thickness t23 (see Figure 7 ). The thickness t23 is preferably greater than the thickness t21. The thickness t23 is preferably thinner than the thickness t22. The thickness t22 is, for example, greater than 1.5 nm and less than 4 nm.

[0086] The fourth layer 44 includes, for example, at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc.

[0087] Hereinafter, some examples related to the magnetic head and the magnetic recording device according to the embodiment will be described.

[0088] Figure 8 This is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment.

[0089] like Figure 8 As shown, the direction D1 from the first magnetic pole 31 to the second magnetic pole 32 may also be inclined relative to the X-axis direction. The direction D1 corresponds to the stacking direction (first direction) of the stacked body 20. The X-axis direction is along the magnetic pole surface 30F of the first magnetic pole 31. The angle between the direction D1 and the magnetic pole surface 30F is set to angle θ1. The angle θ1 is, for example, greater than 15 degrees and less than 30 degrees. The angle θ1 may also be 0 degrees.

[0090] Fig. 9 1 is a schematic perspective view of a magnetic head according to an exemplary embodiment.

[0091] like Fig. 9 As shown, the magnetic head 110 includes, for example, a recording unit 60 and a reproducing unit 70. The recording unit 60 of the magnetic head 110 records information on the magnetic recording medium 80. The reproducing unit 70 reproduces the information recorded on the magnetic recording medium 80.

[0092] The magnetic recording medium 80 includes, for example, a dielectric substrate 82 and a magnetic recording layer 81 provided on the dielectric substrate 82. The magnetization 83 of the magnetic recording layer 81 is controlled by the recording unit 60.

[0093] The reproduction unit 70 includes, for example, a first reproduction shield 72a, a second reproduction shield 72b, and a magnetic reproduction element 71. The magnetic reproduction element 71 is provided between the first reproduction shield 72a and the second reproduction shield 72b. The magnetic reproduction element 71 can output a signal corresponding to the magnetization 83 of the magnetic recording layer 81.

[0094] like Fig. 9 As shown, the magnetic recording medium 80 moves relative to the magnetic head 110 in the direction of the medium moving direction 85. The magnetic head 110 controls the information corresponding to the magnetization 83 of the magnetic recording layer 81 at an arbitrary position. The magnetic head 110 reproduces the information corresponding to the magnetization 83 of the magnetic recording layer 81 at an arbitrary position.

[0095] Fig.10 It is a schematic perspective view of a part of the magnetic recording device according to the embodiment.

[0096] Fig.10 A head slider is illustrated.

[0097] The magnetic head 110 is provided on a head slider 159. The head slider 159 is made of, for example, Al2O3 / TiC, etc. The head slider 159 moves relative to the magnetic recording medium 80 while floating on or contacting the magnetic recording medium 80.

[0098] 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 floating or contacting the magnetic recording medium.

[0099] Fig.11 It is a schematic perspective view of a magnetic recording device according to an exemplary embodiment.

[0100] like Fig.11 As shown, in the magnetic recording device 150 of the embodiment, a rotary actuator is used. The recording medium disk 180 is mounted on the 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 the control signal from the drive device control unit. The magnetic recording device 150 of this embodiment may also 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). For the recording medium 181, for example, a non-volatile memory such as a flash memory is used. For example, the magnetic recording device 150 may also be a hybrid HDD (Hard Disk Drive).

[0101] The head slider 159 records and reproduces information recorded on the recording medium disk 180. The head slider 159 is provided at the front end of the thin film suspension 154. The magnetic head (for example, the magnetic head 110) of the embodiment is provided near the front end of the head slider 159.

[0102] When the recording medium disk 180 rotates, the pressing pressure of the suspension 154 and the pressure generated on the medium facing surface (ABS) of the head slider 159 are balanced. The distance between the medium facing surface of the head slider 159 and the surface of the recording medium disk 180 becomes a predetermined floating amount. In the embodiment, the head slider 159 may also contact the recording medium disk 180. For example, a contact travel type may also be applied.

[0103] 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, etc. The bobbin portion holds a driving 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 driving coil and a magnetic circuit. The driving coil is wound around the bobbin portion of the arm 155. The magnetic circuit includes a permanent magnet and a relative yoke. The driving coil is provided between the permanent magnet and the relative yoke. The suspension 154 has one end and the other end. A magnetic head (e.g., the magnetic head 110) is provided at one end of the suspension 154. The arm 155 is connected to the other end of the suspension 154.

[0104] The arm 155 is held by a ball bearing. The ball bearings are provided at two locations, one above and one below, of the bearing portion 157. The arm 155 can be rotated and slid by the voice coil motor 156. The magnetic head can be moved to any position of the recording medium disk 180.

[0105] Fig.12 (a) and Fig.12 (b) is a schematic perspective view of a part of the magnetic recording device according to the embodiment.

[0106] Fig.12 (a) illustrates a partial structure of the magnetic recording device and is an enlarged perspective view of the head stack assembly 160 .

[0107] Fig.12 (b) is a perspective view illustrating a magnetic head assembly (head gimbal assembly: HGA) 158 which is a part of the head stack assembly 160 .

[0108] like Fig.12 As shown in (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 from the bearing portion 157. The extension direction of the support frame 161 is opposite to the extension direction of the head gimbal assembly 158. The support frame 161 supports the coil 162 of the voice coil motor 156.

[0109] like Fig.12 As shown in (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.

[0110] A head slider 159 is provided at the front end of the suspension 154. The head slider 159 is provided with the magnetic head (for example, the magnetic head 110) of the embodiment.

[0111] The head assembly (head gimbal assembly) 158 of the embodiment includes the head of the embodiment (for example, the head 110), a head slider 159 provided with the 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.

[0112] The suspension 154 has, for example, leads (not shown) for recording and reproducing signals. The suspension 154 may also have leads (not shown) for a heater for adjusting the floating amount. The suspension 154 may also have leads (not shown) for, for example, an oscillating element. These leads are electrically connected to a plurality of electrodes provided on the magnetic head.

[0113] The magnetic recording device 150 includes a signal processing unit 190. The signal processing unit 190 uses a magnetic head to record and reproduce signals on a magnetic recording medium. In the signal processing unit 190, input and output lines of the signal processing unit 190 are connected to electrode pads of the head gimbal assembly 158, for example, and are electrically connected to the magnetic head.

[0114] The magnetic recording device 150 of the embodiment includes a magnetic recording medium, a magnetic head of the embodiment, a movable part, a position control part and a signal processing part. The movable part can make the magnetic recording medium and the magnetic head move relative to each other in a separated or contacted state. The position control part and the signal processing part that aligns the magnetic head to a predetermined recording position of the magnetic recording medium perform recording and reproduction of signals to the magnetic recording medium using the magnetic head.

[0115] For example, as the magnetic recording medium, a recording medium disk 180 is used. The movable portion includes, for example, a head slider 159. The position control portion includes, for example, a head gimbal assembly 158.

[0116] The implementation method may include the following technical solutions.

[0117] (Technical Solution 1)

[0118] A magnetic head, comprising:

[0119] 1st magnetic pole;

[0120] a second magnetic pole; and

[0121] a stacked body disposed between the first magnetic pole and the second magnetic pole,

[0122] The laminate comprises:

[0123] A first magnetic component;

[0124] a second magnetic member disposed between the first magnetic member and the second magnetic pole; and

[0125] The first layer is provided between the first magnetic component and the second magnetic component and includes at least one selected from the group consisting of Cr, V, Mn, Ti and Sc.

[0126] The first magnetic component includes a plurality of first magnetic regions and a first non-magnetic region.

[0127] A direction from one of the plurality of first magnetic regions to another one of the plurality of first magnetic regions is along a first direction from the first magnetic pole to the second magnetic pole,

[0128] The first non-magnetic region is located between the one of the plurality of first magnetic regions and the other one of the plurality of first magnetic regions,

[0129] The first nonmagnetic region includes at least one selected from the group consisting of Cr, V, Mn, Ti and Sc,

[0130] The plurality of first magnetic regions include at least one selected from the group consisting of Fe, Co, and Ni,

[0131] A first layer thickness of the first layer along the first direction is thicker than a first nonmagnetic region thickness of the first nonmagnetic region along the first direction.

[0132] (Technical Solution 2)

[0133] According to the magnetic head described in technical solution 1,

[0134] The thickness of the first layer exceeds 1 times and is 16.7 times or less the thickness of the first nonmagnetic region.

[0135] (Technical Solution 3)

[0136] According to the magnetic head described in technical solution 2,

[0137] The first layer has a thickness of 0.8 nm or more and 2.5 nm or less.

[0138] (Technical Solution 4)

[0139] According to the magnetic head described in technical solution 2,

[0140] The first layer has a thickness of 0.8 nm or more and 1.2 nm or less.

[0141] (Technical Solution 5)

[0142] The magnetic head according to any one of technical solutions 2 to 4,

[0143] The first nonmagnetic region has a thickness of 0.15 nm to 0.8 nm.

[0144] (Technical Solution 6)

[0145] The magnetic head according to any one of technical solutions 1 to 5,

[0146] The first magnetic region thickness of the one of the plurality of first magnetic regions along the first direction is greater than or equal to 0.15 nm and less than or equal to 0.8 nm.

[0147] (Technical Solution 7)

[0148] The magnetic head according to any one of technical solutions 1 to 6,

[0149] The first magnetic component includes a plurality of first non-magnetic regions.

[0150] One of the plurality of first magnetic regions is located between one of the plurality of first non-magnetic regions and another one of the plurality of first non-magnetic regions.

[0151] (Technical Solution 8)

[0152] According to the magnetic head described in technical solution 7,

[0153] The number of the plurality of first magnetic regions is 2 or more and 20 or less.

[0154] (Technical Solution 9)

[0155] According to the magnetic head described in technical solution 7 or 8,

[0156] One of the plurality of first nonmagnetic regions is in contact with the first layer.

[0157] (Technical Solution 10)

[0158] The magnetic head according to any one of technical solutions 1 to 9,

[0159] One of the plurality of first magnetic regions is in contact with the first layer.

[0160] (Technical Solution 11)

[0161] The magnetic head according to any one of technical solutions 1 to 10,

[0162] The laminate includes a second layer disposed between the second magnetic member and the second magnetic pole.

[0163] The second layer includes Cu.

[0164] (Technical Solution 12)

[0165] According to the magnetic head described in technical solution 11,

[0166] The laminate includes a second magnetic pole side magnetic layer provided between the second layer and the second magnetic pole,

[0167] The second magnetic-pole-side magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni.

[0168] (Technical Solution 13)

[0169] The magnetic head according to any one of technical solutions 1 to 12,

[0170] The laminate includes a third layer disposed between the first magnetic pole and the first magnetic component.

[0171] The third layer includes at least one selected from the group consisting of Ta, Ru, and Cr.

[0172] (Technical Solution 14)

[0173] The magnetic head according to any one of technical solutions 1 to 12,

[0174] The stacked body further includes a third magnetic component disposed between the first magnetic pole and the first magnetic component.

[0175] The third magnetic component includes a plurality of third magnetic regions and a third non-magnetic region.

[0176] A direction from one of the plurality of third magnetic regions to another one of the plurality of third magnetic regions is along the first direction,

[0177] The third non-magnetic region is located between the one of the plurality of third magnetic regions and the other one of the plurality of third magnetic regions.

[0178] The third nonmagnetic region includes at least one selected from the group consisting of Cr, V, Mn, Ti and Sc,

[0179] The plurality of third magnetic regions include at least one selected from the group consisting of Fe, Co, and Ni.

[0180] (Technical Solution 15)

[0181] The magnetic head according to any one of technical solutions 1 to 14,

[0182] The second magnetic member includes at least one selected from the group consisting of Fe, Co, and Ni.

[0183] (Technical Solution 16)

[0184] The magnetic head according to any one of technical solutions 1 to 14,

[0185] The second magnetic component includes a plurality of second magnetic regions and a second non-magnetic region.

[0186] A direction from one of the plurality of second magnetic regions to another one of the plurality of second magnetic regions is along the first direction,

[0187] The second non-magnetic region is located between the one of the plurality of second magnetic regions and the other one of the plurality of second magnetic regions.

[0188] The second nonmagnetic region includes at least one selected from the group consisting of Cr, V, Mn, Ti and Sc,

[0189] The plurality of second magnetic regions include at least one selected from the group consisting of Fe, Co, and Ni.

[0190] (Technical Solution 17)

[0191] According to the magnetic head described in technical solution 16,

[0192] The second magnetic component includes a plurality of second non-magnetic regions.

[0193] One of the plurality of second magnetic regions is located between one of the plurality of second non-magnetic regions and another one of the plurality of second non-magnetic regions.

[0194] (Technical Solution 18)

[0195] The magnetic head according to any one of technical solutions 1 to 17,

[0196] When a current in a direction from the second magnetic member to the first magnetic member flows through the stack, an alternating current magnetic field is emitted from the stack.

[0197] (Technical Solution 19)

[0198] A magnetic recording device comprising:

[0199] The magnetic head according to any one of technical solutions 1 to 17; and

[0200] Circuit,

[0201] The circuit is capable of supplying current to the magnetic head,

[0202] The current has a direction from the second magnetic member to the first magnetic member.

[0203] (Technical Solution 20)

[0204] According to the magnetic recording device described in technical solution 19,

[0205] When the current flows through the stacked body, an alternating current magnetic field is emitted from the stacked body.

[0206] According to the embodiment, it is possible to provide a magnetic head and a magnetic recording device capable of performing stable operations.

[0207] In the present application specification, “perpendicular” and “parallel” are not only strictly perpendicular and strictly parallel, but also include, for example, unevenness in the manufacturing process, as long as they are substantially perpendicular and substantially parallel.

[0208] The embodiments of the present invention are described above with reference to specific examples. However, the present invention is not limited to these specific examples. For example, the specific configuration of each element such as a magnetic pole, a magnetic component, a magnetic region, a non-magnetic region, a laminate, a magnetic layer, and a non-magnetic layer contained in a magnetic head is included in the scope of the present invention as long as it can be appropriately selected from a known range by a person skilled in the art to implement the present invention in the same manner and obtain the same effect.

[0209] A technology obtained by combining any two or more elements of each specific example within a technically possible range is also included in the scope of the present invention as long as it includes the gist of the present invention.

[0210] In addition, all magnetic heads and magnetic recording devices that can be implemented by those skilled in the art by appropriately designing and modifying the magnetic heads and magnetic recording devices described above as embodiments of the present invention also belong to the scope of the present invention as long as they include the gist of the present invention.

[0211] In addition, within the scope of the concept of the present invention, those skilled in the art can conceive of various changes and modifications, and it should be understood that these changes and modifications also belong to the scope of the present invention.

[0212] Although some embodiments of the present invention are described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the scope of the subject matter of the invention. These embodiments and their variations are included in the scope and subject matter of the invention, and are included in the invention described in the claims and their equivalents.

Claims

1. A magnetic recording head comprising: 1st magnetic pole; a second magnetic pole; and a stacked body disposed between the first magnetic pole and the second magnetic pole, The laminate comprises: A first magnetic component; a second magnetic component disposed between the first magnetic component and the second magnetic pole; and The first layer is provided between the first magnetic component and the second magnetic component and includes at least one selected from the group consisting of Cr, V, Mn, Ti and Sc. The first magnetic component includes a plurality of first magnetic regions and a first non-magnetic region. A direction from one of the plurality of first magnetic regions to another one of the plurality of first magnetic regions is along a first direction from the first magnetic pole to the second magnetic pole, The first non-magnetic region is located between the one of the plurality of first magnetic regions and the other one of the plurality of first magnetic regions, The first nonmagnetic region includes at least one selected from the group consisting of Cr, V, Mn, Ti and Sc, The plurality of first magnetic regions include at least one selected from the group consisting of Fe, Co, and Ni, A first layer thickness of the first layer along the first direction is thicker than a first nonmagnetic region thickness of the first nonmagnetic region along the first direction.

2. The magnetic recording head according to claim 1, The first layer has a thickness of 0.8 nm or more and 2.5 nm or less.

3. The magnetic recording head according to claim 1, The first nonmagnetic region has a thickness of 0.15 nm to 0.8 nm.

4. The magnetic recording head according to claim 1, The first magnetic region thickness of the one of the plurality of first magnetic regions along the first direction is greater than or equal to 0.15 nm and less than or equal to 0.8 nm.

5. The magnetic recording head according to claim 1, The first magnetic component includes a plurality of first non-magnetic regions. One of the plurality of first magnetic regions is located between one of the plurality of first non-magnetic regions and another one of the plurality of first non-magnetic regions.

6. The magnetic recording head according to claim 1, The stacked body further includes a third magnetic member disposed between the first magnetic pole and the first magnetic member. The third magnetic component includes a plurality of third magnetic regions and a third non-magnetic region. A direction from one of the plurality of third magnetic regions to another one of the plurality of third magnetic regions is along the first direction, The third non-magnetic region is located between the one of the plurality of third magnetic regions and the other one of the plurality of third magnetic regions. The third nonmagnetic region includes at least one selected from the group consisting of Cr, V, Mn, Ti and Sc, The plurality of third magnetic regions include at least one selected from the group consisting of Fe, Co, and Ni.

7. The magnetic recording head according to claim 1, The second magnetic member includes at least one selected from the group consisting of Fe, Co, and Ni.

8. The magnetic recording head according to claim 1, The second magnetic component includes a plurality of second magnetic regions and a second non-magnetic region. A direction from one of the plurality of second magnetic regions to another one of the plurality of second magnetic regions is along the first direction, The second non-magnetic region is located between the one of the plurality of second magnetic regions and the other one of the plurality of second magnetic regions. The second nonmagnetic region includes at least one selected from the group consisting of Cr, V, Mn, Ti and Sc, The plurality of second magnetic regions include at least one selected from the group consisting of Fe, Co, and Ni.

9. A magnetic recording device comprising: The magnetic recording head according to claim 1; and Circuit, The circuit is capable of supplying current to the magnetic recording head, The current has a direction from the second magnetic member to the first magnetic member.

Images