WO2010053187A1 - 情報記録装置 - Google Patents
情報記録装置 Download PDFInfo
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- WO2010053187A1 WO2010053187A1 PCT/JP2009/069083 JP2009069083W WO2010053187A1 WO 2010053187 A1 WO2010053187 A1 WO 2010053187A1 JP 2009069083 W JP2009069083 W JP 2009069083W WO 2010053187 A1 WO2010053187 A1 WO 2010053187A1
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- magnetic field
- magnetic pole
- fgl
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N50/00—Galvanomagnetic devices
- H10N50/10—Magnetoresistive devices
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
- G11B5/3109—Details
- G11B5/313—Disposition of layers
- G11B5/3133—Disposition of layers including layers not usually being a part of the electromagnetic transducer structure and providing additional features, e.g. for improving heat radiation, reduction of power dissipation, adaptations for measurement or indication of gap depth or other properties of the structure
- G11B5/314—Disposition of layers including layers not usually being a part of the electromagnetic transducer structure and providing additional features, e.g. for improving heat radiation, reduction of power dissipation, adaptations for measurement or indication of gap depth or other properties of the structure where the layers are extra layers normally not provided in the transducing structure, e.g. optical layers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B61/00—Magnetic memory devices, e.g. magnetoresistive RAM [MRAM] devices
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N59/00—Integrated devices, or assemblies of multiple devices, comprising at least one galvanomagnetic or Hall-effect element covered by groups H10N50/00 - H10N52/00
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B2005/0002—Special dispositions or recording techniques
- G11B2005/0005—Arrangements, methods or circuits
- G11B2005/001—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B2005/0002—Special dispositions or recording techniques
- G11B2005/0005—Arrangements, methods or circuits
- G11B2005/0024—Microwave assisted recording
Definitions
- the present invention relates to an information recording apparatus having a function of recording information by irradiating a magnetic recording medium with a high frequency magnetic field to excite magnetic resonance and inducing magnetization reversal of the recording medium.
- Patent Document 1 discloses a recording method in which a magnetic recording medium is subjected to Joule heating or magnetic resonance heating with a high frequency magnetic field to locally reduce the coercive force of the medium.
- microwave assisted recording a strong microwave band high frequency magnetic field is irradiated to a nanometer order region to locally excite the recording medium and reduce the magnetization reversal magnetic field to record information. Since magnetic resonance is used, a large magnetization reversal magnetic field reduction effect cannot be obtained unless a high-frequency magnetic field having a strong frequency proportional to the anisotropic magnetic field of the recording medium is used.
- Patent Document 2 Japanese Patent Laying-Open No. 2005-025831
- Patent Document 2 has a structure in which a laminated film having a structure similar to a GMR element (giant magnetoresistive effect element) is sandwiched between electrodes as a high-frequency oscillation element intended for microwave-assisted recording.
- An element is disclosed.
- the element can generate a minute high-frequency oscillating magnetic field by injecting conduction electrons having a spin fluctuation generated in the GMR structure into a magnetic material via a non-magnetic material.
- Nature 425, 380 (2003) reports microwave oscillation by spin torque.
- Microwave Assisted Magnetic Recording described in the TMRC2007-B7 lecture draft (Non-patent Document 2) includes a high-speed rotating magnet that rotates at high speed by spin torque in the vicinity of the magnetic recording medium adjacent to the main pole of the perpendicular magnetic head.
- a technique for recording information on a magnetic recording medium having a large magnetic anisotropy by arranging a field generation layer (hereinafter abbreviated as FGL) to generate a microwave (high frequency magnetic field) is disclosed.
- the recording density required in magnetic recording has exceeded about 1 Tbit per square inch.
- a strong high-frequency magnetic field is applied to a nanometer. It is necessary to record the information by irradiating the order region to bring the magnetic recording medium into a local magnetic resonance state and reducing the magnetization reversal field.
- Patent Documents 1 and 2 or Non-Patent Document 1 it is difficult to achieve a high recording density of 1 Tbit / square inch because the frequency of the oscillating high-frequency magnetic field is too low or the magnetic field strength is too weak. is there.
- Non-Patent Document 2 If the technique disclosed in Non-Patent Document 2 is used, it is possible to generate a strong magnetic field to some extent, but a magnetization rotating body (FGL) whose magnetization is rotated by spin torque is fixed in the direction of the leakage magnetic field from the main magnetic pole. Therefore, there is a drawback that high frequency oscillation is not sustained in practice. Even if the effect of reducing the leakage magnetic field from the main magnetic pole is devised, the magnetization direction of the spin source is fixed, so the main magnetic pole magnetic field component applied perpendicular to the FGL and the spin torque flowing into the FGL The relationship with the direction depends on the polarity of the main magnetic pole.
- FGL magnetization rotating body
- Non-Patent Document 2 Since the optimum drive current value is different, the frequency of the obtained high-frequency magnetic field is different and there is a disadvantage that good writing cannot be performed.
- the inventors of the present invention as a result of research, have adopted a configuration in which a laminated film constituting an FGL is disposed adjacent to a protrusion (lip) portion provided on the main magnetic pole, so that the high frequency from the main magnetic pole.
- the inflow magnetic field to the magnetic field generator was found to be perpendicular to the film surface.
- the main magnetic pole or the counter magnetic pole is used as a spin source, it is not necessary to change the value of the drive current according to the polarity of the main magnetic pole, and to always obtain the maximum strength of the high frequency magnetic field according to the desired frequency. Design became possible.
- the main magnetic pole or the counter magnetic pole as a spin source, the main magnetic pole magnetic field component applied perpendicularly to the FGL and the direction of the spin torque flowing into the FGL are simultaneously reversed in synchronization with the reversal of the main magnetic pole polarity. The state does not depend on the polarity of the main pole. Therefore, oscillation at an optimum high frequency magnetic field frequency determined according to the recording medium to be used is realized without changing the FGL drive current.
- the present invention provides an information recording apparatus that performs high-frequency magnetic field generated by FGL and performs the magnetic recording to solve the above-mentioned problems that occur with narrowing of the track and has high recording / reproducing performance. With the goal.
- the inventors of the present invention analyzed the high-frequency magnetic field generated from the FGL, it was found that not only the magnitude of the magnetic field but also the direction of the magnetic field changed with time. This variation in the direction of the magnetic field is not so much affected when the width of the FGL is larger than the length in the height direction, but cannot be ignored when the width of the FGL is narrowed.
- the influence of the magnetic field generated from the side surface of the FGL is such that the direction of the magnetic field changes in synchronization with the rotation of the FGL magnetization on the recording medium because the phase of the generated magnetic field from the ABS surface of the FGL is shifted by 90 degrees. Appears. At this time, the high-frequency magnetic field felt by the recording medium loses the balance between the component that contributes to the desired magnetization reversal (rotation direction) and the component that reinverts the reversed magnetization (rotation direction).
- the high frequency magnetic field felt by the recording medium does not rotate (linearly polarized light), so that the component that contributes to the desired magnetization reversal and the reversed magnetization reversal component are balanced.
- the write magnetic field from the main magnetic pole is sufficient, it can be biased to a desired magnetization reversal.
- the rotation direction of the magnetization of the FGL is constant, if the magnetization reversal pattern is formed in a state where the balance between the two is lost, the probability that the reversed magnetization is reversed again increases. Even when the balance between the two is balanced, if the high-frequency magnetic field is too strong compared to the write magnetic field from the main magnetic pole, the effect of re-reversing the reversed magnetization becomes strong.
- the magnetization transition width of the recording bit (boundary width between the self bit and the adjacent bit) is widened, and for bit pattern media (BPM). It is expected that the probability that the magnetization of the pattern cannot be reversed will increase.
- a portion that is receded from the air bearing surface (ABS surface: the surface facing the information recording medium of the magnetic head) is the track width of the FGL. It has been found that by providing at the end of the direction, the variation in the direction of the magnetic field and the influence of the magnetic field from the side surface can be reduced.
- the shape of the receding portion may be a simple step shape or a shape that recedes from the air bearing surface in a tapered shape. Alternatively, other more complicated shapes may be used.
- An information recording apparatus having a recording density exceeding 1 Tbit per square inch can be realized, and at the same time, the reliability can be improved, and as a result, the cost can be reduced.
- produces from FGL.
- the figure of the simulation result which shows the change of the magnetization reversal state of a recording medium by the direction of precession of a high frequency magnetic field (clockwise oscillating magnetic field, one-way oscillating magnetic field, counterclockwise oscillating magnetic field).
- the figure which shows FGL in which the taper part was formed also in the upper surface side in addition to the taper part on the ABS surface side.
- FIG. 3 is a schematic cross-sectional view of the recording head and the recording medium of Example 1 as viewed from the track width direction.
- FIG. 10B is a cross-sectional view of the schematic diagram shown in FIG. 10A as seen from the direction cut by the line segment Z-Z ′. The schematic diagram which looked at the schematic diagram shown to FIG.
- FIG. 10A from the upper surface side (surface opposite to the ABS surface side).
- FIG. 10B is a diagram showing a slider and a recording / reproducing head on which the recording head shown in FIG. 10A is mounted.
- the schematic diagram which shows the relationship between a slider and a head running direction.
- the schematic diagram which shows the relationship between a slider and a head running direction.
- FIG. 3 is a diagram illustrating a configuration example of a magnetic head.
- FIG. 3 is a diagram illustrating a configuration example of a magnetic head.
- FIG. 3 is a diagram illustrating a configuration example of a magnetic head.
- FIG. 3 is a diagram illustrating a configuration example of a magnetic head.
- FIG. 3 is a diagram illustrating a configuration example of a magnetic head.
- FIG. 6 is a schematic cross-sectional view of the recording head and the recording medium of Example 2 as viewed from the track width direction.
- the schematic diagram which looked at the schematic diagram shown to FIG. 11A from the upper surface side (surface opposite to the ABS surface side).
- FIG. 9 is a schematic cross-sectional view of the recording head and the recording medium of Example 3 as viewed from the track width direction.
- FIG. 12B is a cross-sectional view of the schematic diagram shown in FIG. 12A as seen from the direction cut along line Y-Y ′.
- FIG. 3 is a plan view showing a basic configuration of a magnetic disk device in Examples 1 to 3.
- FIG. 13B is a cross-sectional view taken along the line AA ′ of FIG. 13A.
- FIG. 6 is a configuration diagram of a recording / reproducing element of Example 4.
- FIG. 6 is a configuration diagram of a recording / reproducing element of Example 4.
- An example of an electrode pattern for integrating the recording / reproducing elements shown in FIGS. 14A and 14B The figure which shows an example of the electrode pattern for integrating the recording / reproducing element shown to FIG. 14A and 14B.
- FIG. 1 shows an example of a magnetic field generated from the FGL.
- the peripheral magnetic field was analyzed assuming that the magnetic field from the FGL has uniform magnetization inside the FGL and magnetization is generated on the end face perpendicular to the magnetization rotation plane.
- Rectangular surface elements ⁇ (x 1 , y 1 , z 0 ), (x 1 , y 2 , z 0 ), (x 2 , y 1 , z 0 ), (x 2 , y 2 , z 0 ) ⁇ to the origin (A / m) is expressed by the following equation (1)
- the rotation of the high-frequency oscillating magnetic field at the origin in FIG. 1 is in the yz plane with no x-directional component. Therefore, considering that the effective component of inversion of the magnetic material having the easy magnetization axis in the z-axis direction is only the high-frequency oscillating magnetic field component in the y-direction, the high-frequency oscillating magnetic field at the origin is considered to be substantially linearly polarized light. Since the magnetic field in the magnetization direction does not give torque to the magnetization, it does not affect the magnetization itself.
- the “linearly polarized light” used in the present invention is defined as a situation where the vibration direction of the high-frequency oscillating magnetic field does not change with time.
- substantially linearly polarized light is defined as a state in which the vibration direction does not change with time if the vibration magnetic field component in the magnetization direction is ignored when the magnetization direction of the magnetic material to be inverted is taken into consideration. . Further, in the present specification, when there is a magnetic material to be reversed, “substantially” is omitted.
- R 11 , R 12 , R 21 , and R 22 are distances from the origin to the vertex of the rectangle.
- the magnetic field distribution generated by the FGL and its change over time were obtained by weighting and adding the contribution from each surface of the FGL with the magnetization direction of the FGL.
- the FGL magnetic field can be regarded as almost linearly polarized light when the track width is wide and only the magnetic field from the ABS surface needs to be considered.
- the width w of the FGL is reduced to reduce the track pitch as the recording density is increased, the influence of the magnetic field from the side surface of the FGL cannot be ignored, and the FGL magnetic field becomes elliptically polarized light.
- the z-axis and the y-axis should be read in Equation (1) and related equations.
- the “elliptical polarization” used in the present invention is a situation in which the vibration direction and magnitude of the high-frequency oscillating magnetic field change with time, and the locus of the magnetic field vector forms an ellipse.
- the trajectory of the magnetic field vector forms an ellipse and behaves as if precessing.
- the plane element of Equation (1) is moved by X p in the x-axis direction. What is necessary is just to calculate the magnetic field to the origin.
- the ellipticity r is defined by the ratio of the minor axis to the major axis (H ac-y / H ac-x ).
- the high-frequency magnetic field generated at the recording bit formation position is changed from the ellipse to the circle gradually as the length of the FGL in the track width direction becomes smaller. I knew that I was approaching.
- An oscillating magnetic field component perpendicular to the magnetization to be reversed contributes to the reversal.
- the calculation is based on the assumption that magnetic particles having uniaxial magnetic anisotropy are reversed according to the simultaneous rotation model, and the behavior of the magnetization M was calculated using the following LLG equation.
- the static magnetic field H d considered in this study is a static magnetic field created by the magnetic particles to be calculated, but in reality, it is necessary to consider the influence of adjacent particles and the like.
- the external magnetic field H ext is a magnetic field applied to the magnetic body from the outside of the magnetic body.
- FIG. 2 shows the application direction of the effective magnetic field.
- H ext was applied in the direction opposite to the initial magnetization direction and inclined by ⁇ h from the vertical direction. Magnetization is reversed from the + z direction to the ⁇ z direction while rotating about the z axis.
- the application direction of the high-frequency magnetic field H ac is shown only in the horizontal direction, z-H and linearly polarized light perpendicular to the linearly polarized light and z-H ext surface of ext plane, in a plane perpendicular to the z-axis
- FIG. 3 shows the magnetization reversal when a magnetic field H ext and a high-frequency magnetic field H ac from the main pole are applied to a set of 1024 isolated magnetic particles whose easy magnetization axes are perpendicular to the film surface. It is a simulation result which shows a behavior.
- ⁇ indicates a state in which magnetization reversal has been completed by 3 ns (95% or more of 1024 are reversed), and ⁇ indicates a state in which magnetization is not reversed (95% or more of 1024 are not reversed).
- the intermediate color shows a partially inverted state. From the figure, it can be seen that when the AC magnetic field is small, the clockwise oscillating magnetic field component has no inversion to the Stoner-Wohlfarth magnetic field, and the assist effect is not observed.
- the counterclockwise component is considered to have an effect of assisting magnetization reversal by causing magnetic resonance because the AC magnetic field rotates in the same direction as the precession of magnetization.
- a point to note when using a linearly polarized oscillating magnetic field is that when the AC magnetic field is too large, the effect of re-inversion due to the clockwise oscillating magnetic field component becomes significant, and recording cannot be performed.
- the AC magnetic field fixes the H ac-x component and changes the magnitude of the orthogonal H ac-y . In the case of counterclockwise elliptically polarized light, H ac-y is positive, and in the case of clockwise elliptically polarized light, H ac-y is negative.
- H ac-y is, the larger H ac-x is, the smaller H sw is, and a larger assist effect is obtained.
- H ac-y is negative, H sw is large even if the oscillating magnetic field component in the down-track direction is the same, and it can be seen that the assist effect is suppressed by H ac-y component. So flip
- FIG. 5 shows the reversal magnetic field H sw of FIG. 4 with respect to H ac-eff again. From the figure, the reversal magnetic field H sw is on the same curve for various combinations of the H ac-x component and the H ac-y component, and the reversal assist effective AC magnetic field is expressed by equation (4). Is considered effective.
- FIG. 6 shows the switch AC magnetic field width ⁇ H ac-sw at the plotted points in FIG. 4 with respect to the ellipticity.
- the width ⁇ H ac-sw is smaller as the ellipticity is larger, and it is possible to form a favorable reversed magnetization pattern having a large ellipticity even with the same inversion assist effective AC magnetic field.
- the assist effective AC magnetic field H ac-eff is shown.
- the horizontal axis is 0 immediately below FGL, and the main magnetic pole side is a negative value.
- the saturation magnetization of FGL is 2.4T.
- the position where the ellipticity is maximized is 2 nm outside the edge of the FGL, whereas the H ac-eff is maximized 12 nm outside the FGL edge at a distance of 10 nm. If recording is performed at a point where H ac-eff is the maximum, the ellipticity at this time has dropped to 0.6 or less, and there is a possibility that sufficient writing cannot be performed. This is because when the ellipticity at the point where H ac-eff is maximum is 0.6 or less, the probability of magnetization reversal in a certain time is significantly reduced.
- the FGL having a receding portion from the ABS surface at the track width direction end of the bottom surface specifically, an inverted trapezoid in which the shape of the cross section perpendicular to the current flowing through the FGL shown in FIG. 8A has an upper side on the ABS surface side.
- the ellipticity and the reversal assist effective AC magnetic field H ac-eff were calculated. The calculation result is shown in FIG. 8B. The position where the ellipticity is maximum and the position where H ac-eff is maximum match in the vicinity of the FGL edge, and good writing can be expected.
- the maximum value of the reverse assist effective AC magnetic field is 260 kA / m, it is 15% smaller than the maximum value of the reverse assist effective AC magnetic field of 310 kA / m in FIG. It is considered that the magnetic field generated is reduced because the area of the ABS surface of the FGL is reduced.
- FIGS. 8C, 8D, and 8E show an FGL having a tapered portion formed on the ABS surface side as a receding portion
- FIG. 8E shows an FGL having a stepped portion formed on the ABS surface side as the receding portion.
- FIG. 8E shows an FGL having a shape in which a stepped portion is formed on the ABS surface side as a receding portion.
- the length of the size w that determines the track width does not change during lapping from the ABS surface, so that a highly reliable head can be manufactured.
- FIGS. 9A to 9F show configuration examples of FGLs having shapes different from those in FIGS. 8A and 8C to 8E.
- the FGL is disposed between the main magnetic pole and the counter magnetic pole, and a drive current for generating a high frequency magnetic field flows from the main magnetic pole side or the counter magnetic pole side.
- FIGS. 9A to 9F by using FGLs having different shapes in which the cross-sectional area on the main magnetic pole side is smaller than the cross-sectional area on the opposite magnetic pole side, the ellipticity and the peak position of the inversion assist effective AC magnetic field are used. Can be brought closer to the main magnetic pole side.
- the cross-sectional area here means the cross-sectional area in the stacking direction of the multilayer film constituting the FGL.
- FIG. 9A and 9B show a structure in which the difference in the cross-sectional area is formed by a tapered portion from the counter magnetic pole side to the main magnetic pole side (that is, the shape seen from the upper surface side and the ABS surface side is a tapered shape in the track width direction side) FGL of a structure having
- the FGL having such a structure the ellipticity and the peak position of the inversion assist effective AC magnetic field can be brought closer to the main magnetic pole side, and a larger external (main magnetic pole) magnetic field can be used.
- the reduction of the maximum value of the reversal assist effective AC magnetic field is about 5%, which is more effective in suppressing the reversal assist effective AC magnetic field decrease than the FGL of the structure shown in FIGS. 8A and 8C to 8E. It is getting bigger.
- the difference in oscillation characteristics due to the stop timing of the lapping process from the ABS surface side is not so large.
- the apex angle deletion portion is obtained by cutting two apex angles on the ABS surface side among the four apex angles on the main magnetic pole side with respect to the rectangular parallelepiped FGL shown in FIG.
- the FGL of the provided structure is shown.
- the ellipticity and the peak position of the inversion assist effective AC magnetic field almost coincide with each other, and the magnetic field is hardly attenuated.
- production is difficult.
- the structure of FIG. 9C and FIG. 9D protruding to the main magnetic pole side is also conceivable.
- FIGS. 9E and 9F by providing a step structure on the main magnetic pole side (that is, a structure in which the shape seen from the upper surface side and the ABS surface side is a convex shape), the cross-sectional areas on the main magnetic pole side and the counter magnetic pole side are shown.
- achieved these differences is shown.
- the FGL shown in FIG. 9F includes a taper portion in the height direction on the ABS surface side in addition to the step structure on the main magnetic pole side.
- the structures shown in FIGS. 9E and 9F have the advantage that the ellipticity and the peak position of the inversion assist effective AC magnetic field can be matched, and the manufacturing is easier than the FGL having the structure shown in FIGS. 9C and 9D. have. This is because, in order to manufacture the FGL having the structure shown in FIGS. 9E and 9F, the mask pattern used in lithography may be changed once.
- the cross-sectional shape of the FGL May be a vertically long rectangle whose side on the ABS side is shorter than the side on the FGL side.
- the shape magnetic anisotropy is generated in the direction of the leakage magnetic field from the main magnetic pole, the FGL is easily fixed in this direction, and there is a problem that oscillation frequency does not fluctuate and oscillation itself does not occur.
- the cross-sectional shape is an average horizontally long shape, so that the shape magnetic anisotropy is a leakage magnetic field from the main pole. Therefore, the in-plane magnetization rotation of the FGL is smoothly performed.
- the FGL shape shown in FIGS. 9A and 9B has less demagnetization after recording (a phenomenon in which the previous bit is erased when the next bit is recorded). It is effective for improving the SN ratio.
- the reversal assist effective AC magnetic field distribution in the track width direction is also steep, so that the track density can be increased by combining with a high-precision positioning mechanism, and the information recording apparatus further increases the recording density. Can be realized, which is extremely advantageous in terms of size and cost.
- FIG. 10A shows a recording mechanism in which the recording head and the recording medium are cut along a plane perpendicular to the recording medium surface (vertical direction in the figure) and parallel to the head running direction (track direction which is the left or right direction in the figure).
- the peripheral sectional structure is shown.
- a magnetic circuit is formed in the upper part of the drawing between the main magnetic pole 5 and the counter magnetic pole 6 (FIGS. 10D and 10G-a to 10G-d).
- FIG. 10D and 10G-a to 10G-d In the magnetic circuit, the magnetic lines of force form a closed circuit, and it is not necessary to be formed of only a magnetic material.
- an auxiliary magnetic pole or the like may be arranged on the opposite side of the main magnetic pole 5 from the counter magnetic pole 6 to form a magnetic circuit. In this case, the main magnetic pole 5 and the auxiliary magnetic pole need not be electrically insulated.
- the recording head 200 is provided with a coil, a copper wire, etc. for exciting these magnetic circuits.
- the main magnetic pole 5 and the counter magnetic pole 6 are provided with electrodes or means for making electrical contact with the electrodes, and are configured so that a high-frequency excitation current can flow through the FGL 2 from the main magnetic pole 5 side to the counter magnetic pole 6 side or vice versa.
- the material of the main magnetic pole 5 and the counter magnetic pole 6 was a CoFe alloy having a large saturation magnetization and almost no magnetocrystalline anisotropy.
- the auxiliary magnetic pole provided on the opposite side of the main magnetic pole 5 to the opposite magnetic pole 6 is slightly closer to the main magnetic pole 5 side. .
- the lip 8 to the opposing magnetic pole side lip 13 have a columnar structure extending in the left-right direction of the drawing, and the side of the cross section along the ABS surface is a trapezoid shorter than the opposing side (FIG. 10B).
- the side length w along the trapezoidal ABS surface is an important factor for determining the recording track width, and is set to 15 nm in this embodiment.
- the thickness (length in the head running direction) can be set large so that a large recording magnetic field can be obtained (FIG. 10C).
- a recording magnetic field of about 0.9 MA / m is obtained by setting the width to 80 m and the thickness to 100 nm.
- the lip 8 is made of a material having the same or larger saturation magnetization as the main magnetic pole 5, and the thickness of the lip 8 is designed using 3D magnetic field analysis software so that the magnetic field from the main magnetic pole 5 is as perpendicular as possible to the layer direction of the FGL 2. It was. In this example, a (Co / Ni) n artificial lattice film having relatively weak perpendicular magnetic anisotropy was used as the lip 8 in contact with the metal nonmagnetic spin conductive layer 3. The thickness of the lip 8 in this embodiment was 10 nm, but this value depends on the trapezoidal shape, the distance and the situation to the opposing magnetic pole, the situation of the medium used, and the situation of the magnetic circuit above the drawing. .
- FGL2 was a CoFe alloy having a thickness of 20 nm with a large saturation magnetization and almost no magnetocrystalline anisotropy.
- the magnetization rotates at high speed in a plane along the layer, and the leakage magnetic field from the magnetic poles appearing on the ABS surface and the side surface acts as a high-frequency magnetic field.
- the magnetization rotation driving force of the FGL 2 is a spin torque due to the spin reflected by the lip 8 through the metal nonmagnetic spin conduction layer 3.
- This spin torque acts in a direction in which the magnetization component parallel to the magnetization rotation axis of the FGL 2 generated by the leakage magnetic field from the main magnetic pole 5 decreases.
- DC high frequency excitation
- the rotation direction of the magnetization of the FGL 2 is counterclockwise when viewed from the upstream side of the high frequency excitation (DC) current, and the recording medium is reversed by the magnetic field from the main magnetic pole 5.
- a rotating magnetic field having the same direction as the direction of magnetization precession can be applied.
- the rotation direction of the magnetization of the FGL 2 is clockwise when viewed from the upstream side of the high-frequency excitation (DC) current, and the magnetization of the recording medium that is reversed by the magnetic field to the main magnetic pole 5.
- a rotating magnetic field having the same direction as the differential motion direction can be applied. Therefore, the circularly polarized high-frequency magnetic field of FGL 2 has an effect of assisting the magnetization reversal by the main magnetic pole 5 regardless of the polarity of the main magnetic pole 5.
- the high-frequency magnetic field generator of the type described in Non-Patent Document 2 cannot obtain such an effect because the direction of the spin torque does not change depending on the polarity of the main magnetic pole 5.
- the spin torque action increases as the high-frequency excitation current (electron current) increases, and increases when a CoFeB layer having a high polarizability is inserted between the metal nonmagnetic spin conduction layer 3 and the adjacent layer by about 1 nm.
- 2 nm-Cu is used for the metal nonmagnetic spin conductive layer 3
- Ru or the like which is a metal nonmagnetic material with high spin conductivity, may be used.
- the negative perpendicular magnetic anisotropy 11 is such that the c-axis direction of hexagonal CoIr is the left-right direction in the figure, and the magnitude of magnetic anisotropy is 6.0 ⁇ 10 5 J / m 3 Was used.
- a CoCrPt layer having a thickness of 10 nm and a magnetic anisotropic magnetic field of 1.6 MA / m (20 kOe) was used as the recording layer 16 on the substrate 19.
- a magnetic pattern having a track direction length of 9 nm and a down track direction of 7 nm was prepared by a nanoimprint technique so as to be arranged with a track pitch of 12.5 nm and a bit pitch of 10.0 nm. .
- the slider 102 mounted with the recording / reproducing unit 109 incorporating the high-frequency magnetic field generation source 201 of this embodiment was attached to the suspension 106 (FIGS. 10D to 10F) to constitute a head gimbal assembly.
- the recording / reproducing head is arranged in the trailing part of the slider, and in the structure shown in FIG. 10F, the recording / reproducing head is arranged in the leading part of the slider.
- FIGS. 10Gb to 10G-d show possible recording / reproducing head structures other than the structure shown in FIG. 10D.
- FIG. 10G-a is a view of the structure of FIG. 10D from the opposite side. Therefore, in FIGS. 10G-a to 10G-d, the definition of the trailing side and the leading side is that the left side of the paper is the trailing side and the right side of the paper is the leading side.
- FIG. 10G-b shows a configuration example different from FIG. 10G-a.
- the exciting coil of the main magnetic pole 5 is wound not horizontally but horizontally.
- the excitation position is closer to the main magnetic pole air bearing surface than the structure of FIG. 10G-a, so that a stronger magnetic flux is generated from the main magnetic pole 5 than the structure shown in FIG. 10G-a. Can do.
- FIG. 10G-c shows a configuration example of a magnetic head for microwave assist recording in which the recording head portion is arranged on the leading side and the reproducing head portion is arranged on the trailing side.
- the main magnetic pole 5 is arranged at the leading end on the leading side
- the counter magnetic pole 6 is arranged on the trailing side with respect to the main magnetic pole 5.
- the counter magnetic pole 6 and the reproduction sensor shield are shared, but they may be separated.
- the stacking order of the high-frequency generator 201 is the same as the stacking order shown in FIG. 5 as in FIG. 10G-a.
- the winding direction of the exciting coil is the upper winding as in FIG. 10G-a, but it may be laterally wound as shown in FIG. 10G-d.
- the recording head portion having the structure shown in FIGS. 10G-a to 10G-d can be mounted on the magnetic head slider having either structure shown in FIG. 10E or FIG. 10F.
- the recorded magnetic head was measured for recording / reproduction characteristics using a spin stand.
- magnetic recording was performed with a head medium relative speed of 20 m / s, a magnetic spacing of 7 nm, and a track pitch of 12.5 nm, and this was reproduced by a GMR head having a shield interval of 18 nm.
- the signal / noise ratio at 1250 kFCI was measured while changing the high-frequency excitation current, a maximum of 13.0 dB was obtained, and it was found that recording / reproduction with a recording density exceeding 5 Tbits per square inch was sufficiently achievable.
- the high frequency frequency at this time was 35.0 GHz.
- the signal / noise ratio decreases from 14.0 dB to 9.0 dB when the cross section of the FGL2 is rectangular, whereas the inverted trapezoidal cross section of the present invention conversely It rose to 15.0 dB.
- FIG. 13A is a plan view
- FIG. 13B is a sectional view taken along the line AA ′.
- the recording medium 101 is fixed to the rotary bearing 104 and is rotated by the motor 100.
- FIG. 13B shows an example in which five magnetic disks and ten magnetic heads are installed, and three magnetic disks and four magnetic heads are shown. However, there are one or more magnetic disks and one or more magnetic heads. It ’s fine.
- the recording medium 101 has a disk shape, and recording layers are formed on both sides thereof.
- the slider 102 moves in a substantially radial direction on the rotating recording medium surface, and has a magnetic head at the tip.
- the suspension 106 is supported by the rotor reactor 103 via the arm 105.
- the suspension 106 has a function of pressing or pulling the slider 102 against the recording medium 101 with a predetermined load.
- a predetermined electric circuit is required for processing the reproduction signal and inputting / outputting information.
- a signal processing circuit that is an extension of a PRML (Partial Response Maximum Maximum Likelihood) method that actively uses waveform interference at the time of high density is attached to the housing 108 and the like.
- PRML Partial Response Maximum Maximum Likelihood
- the recording head and recording medium described above were incorporated into the magnetic disk device shown in FIGS. 13A and 13B, and performance evaluation was performed. As a result, 2.5 Tbytes ( An information recording / reproducing apparatus using a high-frequency rotating magnetic field having a total recording capacity of 5 Tbytes was obtained.
- FIGS. 11A and 11B are diagrams showing a second configuration example of the recording head and the recording medium according to the present invention.
- the main magnetic pole 5, the counter magnetic pole 6, and the upper and left configurations in the drawing are the same as those in the first configuration example.
- the lip 8 to the opposing magnetic pole side lip 13 are columnar and have a rectangular shape with a long section along the ABS surface. By adopting the rectangular shape, shape anisotropy occurs in the track width direction, so that in-plane magnetization rotation of FGL2 can be smoothly performed even if there is an in-plane component of FGL2 of the leakage magnetic field from the main pole. Thus, the main magnetic pole 5 and the FGL 2 can be brought close to each other.
- the FGL 2 has a trapezoidal shape in which the shape of the ABS surface is short on the main magnetic pole side, and is columnar in the height direction.
- the length of the short side of the trapezoid is an important factor for determining the recording track width, and is 28 nm in this embodiment.
- the thickness (length in the head running direction) can be set large so that a large recording magnetic field can be obtained.
- a recording magnetic field of about 0.8 MA / m is obtained by setting the width to 120 nm and the thickness to 80 nm.
- the lip 8 is made of a material having the same or larger saturation magnetization as the main magnetic pole 5, and the thickness of the lip 8 is designed using 3D magnetic field analysis software so that the magnetic field from the main magnetic pole 5 is perpendicular to the layer direction of the FGL 2.
- the thickness of the lip 8 in this embodiment was 5 nm, but this value depends on the above-mentioned rectangular shape, the distance and situation to the counter magnetic pole, the situation of the medium used, and the situation of the magnetic circuit above the drawing.
- FGL2 was a CoFe alloy having a thickness of 20 nm with a large saturation magnetization and almost no magnetocrystalline anisotropy.
- the magnetization rotates at high speed in the plane along the layer, and the leakage magnetic field from the magnetic pole appearing on the ABS surface acts as a high-frequency magnetic field.
- the magnetization rotation driving force of the FGL 2 is a spin torque due to the spin that is reflected by the opposing magnetic pole side lip 13 via the metal nonmagnetic spin conduction layer 3 and remains in the negative perpendicular magnetic anisotropy 11.
- This spin torque acts in a direction in which the magnetization component parallel to the rotation axis of the FGL 2 generated by the leakage magnetic field from the main magnetic pole 5 becomes smaller. In order to obtain the effect of this spin torque, it is necessary to flow a high frequency excitation current from the counter magnetic pole 6 side to the main magnetic pole 5 side.
- This current direction is also from the metal nonmagnetic spin conduction layer 3 side to the FGL2 side.
- the rotation direction of the magnetization of the FGL 2 is counterclockwise when viewed from the downstream side of the high frequency excitation (DC) current, and the recording medium is reversed by the magnetic field from the main magnetic pole 5.
- a rotating magnetic field having the same direction as the direction of magnetization precession can be applied.
- the rotation direction of the magnetization of the FGL 2 is clockwise when viewed from the downstream side of the high-frequency excitation (DC) current, and the magnetization of the recording medium that is reversed by the magnetic field applied to the main magnetic pole 5.
- a rotating magnetic field having the same direction as the differential motion direction can be applied.
- the circularly polarized high-frequency magnetic field of FGL 2 has an effect of assisting the magnetization reversal by the main magnetic pole 5 regardless of the polarity of the main magnetic pole 5.
- the high-frequency magnetic field generator of the type described in Non-Patent Document 2 cannot obtain such an effect because the direction of the spin torque does not change depending on the polarity of the main magnetic pole 5.
- the configuration of the high-frequency magnetic field generator 201 shown in FIG. 11A is higher than that of the configuration of the high-frequency magnetic field generator 201 shown in FIG. 10A because the spin torque acts on the negative perpendicular magnetic anisotropy 11.
- the operation is stable and the rise of oscillation tends to be faster.
- 2 nm-Cu is used for the metal nonmagnetic spin conductive layer 3, Ru or the like, which is a metal nonmagnetic material with high spin conductivity, may be used.
- the negative perpendicular magnetic anisotropy 11 was such that the 001 plane of hexagonal CoIr was in the horizontal direction in the figure, and the magnitude of magnetic anisotropy was 6.0 ⁇ 10 5 J / m 3 .
- the FGL magnetization rotation is stabilized.
- the spin torque increases as the high-frequency excitation current (electron current) increases, and increases when a CoFeB layer having a high polarizability is inserted between the lip 8 and the metal nonmagnetic spin conduction layer 3 by about 1 nm.
- a 6 nm- (Co / Pt) -SiO x artificial lattice layer of 4 kA / m (17 kOe) was used.
- the damping constant ⁇ of the upper recording layer 17 and the lower recording layer 18 was 0.20 and 0.02, respectively. If there is a Pt layer or a Pd layer, ⁇ can be increased and the magnetization reversal speed can be increased.
- a discrete track medium having a length in the track direction of 25 nm and a track pitch of 35 nm was produced by nanoimprint technology.
- Magnetic recording was performed using a spin stand at a head medium relative speed of 20 m / s, a magnetic spacing of 5 nm, and a track pitch of 35 nm, and this was reproduced by a GMR head having a shield interval of 25 nm.
- the recording head and the recording medium described above were incorporated into the magnetic disk apparatus shown in FIGS. 13A and 13B and performance evaluation was performed.
- the information recording / reproducing apparatus used was obtained.
- the aspect ratio of the cross section perpendicular to the current can be set relatively freely. Therefore, the FGL structure can be designed according to the leakage magnetic field from the main magnetic pole having the optimum structure for the recording medium to be used. is there.
- FIGS. 12A and 12B are diagrams showing a third configuration example of the recording head and the recording medium according to the present invention.
- the main magnetic pole 5, the counter magnetic pole 6, and the upper and left configurations in the drawing are the same as those in the first configuration example.
- Adjacent to the main magnetic pole 5, the lip 8, the metal nonmagnetic spin conduction layer 3, the FGL (magnetization high-speed rotator) 2, the metal nonmagnetic spin scatterer 12, and the counter magnetic pole side lip 13 reach the counter magnetic pole 6. .
- the lip 8 to the opposite magnetic pole side lip 13 have a columnar structure extending in the left-right direction in the drawing, and the end of the trapezoidal track width direction whose section is along the ABS surface is shorter than the opposite side is perpendicular to the medium surface.
- the side length w along the hexagonal ABS surface is an important factor for determining the recording track width, and is set to 15 nm in this embodiment.
- the lip 8 is made of a material having the same or larger saturation magnetization as the main magnetic pole 5, and the thickness of the lip 8 is designed using 3D magnetic field analysis software so that the magnetic field from the main magnetic pole 5 is as perpendicular as possible to the layer direction of the FGL 2. It was.
- the thickness of the lip 8 in this embodiment was 8 nm, but this value depends on the hexagonal shape, the distance to the opposing magnetic pole and the situation, the situation of the medium used, and the situation of the magnetic circuit above the drawing. .
- FGL2 was a CoFe alloy having a thickness of 25 nm with a large saturation magnetization and almost no magnetocrystalline anisotropy.
- FGL2 a (Co / Fe) n artificial lattice film having negative perpendicular magnetic anisotropy
- the magnetization rotation is stabilized and good oscillation characteristics are obtained. It is done.
- the magnetization rotates at high speed in a plane along the layer, and the leakage magnetic field from the magnetic poles appearing on the ABS surface and the side surface acts as a high-frequency magnetic field.
- the magnetization rotation driving force of the FGL 2 is a spin torque due to the spin reflected by the lip 8 through the metal nonmagnetic spin conduction layer 3.
- This spin torque acts in a direction in which the magnetization component parallel to the rotation axis of the FGL 2 generated by the leakage magnetic field from the main magnetic pole 5 becomes smaller.
- DC high frequency excitation
- the rotation direction of the magnetization of the FGL 2 is clockwise when viewed from the upstream side of the high-frequency excitation (DC) current, and the magnetization of the recording medium that is reversed by the magnetic field to the main magnetic pole 5.
- a rotating magnetic field having the same direction as the differential motion direction can be applied. Therefore, the circularly polarized high-frequency magnetic field of FGL 2 has an effect of assisting the magnetization reversal by the main magnetic pole 5 regardless of the polarity of the main magnetic pole 5.
- the high-frequency magnetic field generator of the type described in Non-Patent Document 2 cannot obtain such an effect because the direction of the spin torque does not change depending on the polarity of the main magnetic pole 5.
- the spin torque action increases as the high-frequency excitation current (electron current) increases, and increases when a CoFeB layer having a high polarizability is inserted between the metal nonmagnetic spin conduction layer 3 and the adjacent layer by about 1 nm.
- metal nonmagnetic spin conductive layer 3 Ru or the like, which is a metal nonmagnetic material with high spin conductivity, may be used.
- metal nonmagnetic spin scatterer 12 3 nm-Pt was used. Even if Pd is used, the same effect is obtained. A 15 nm CoFe alloy was used for the opposed magnetic pole side lip 13.
- the recording medium 7 has a 6 nm- (Co / Pt) artificial lattice layer having a magnetic anisotropy field of 2.8 MA / m (34 kOe) as the upper recording layer 17, and the magnetic recording field 4 has a magnetic anisotropy field of 4 in the lower recording layer 18.
- a 6 nm-FePt layer of .8 MA / m (60 kOe) was used.
- the damping constant ⁇ of the upper recording layer 17 and the lower recording layer 18 was 0.20 and 0.02, respectively.
- etching was performed by EB mastering so that a magnetic pattern having a track direction length of 15 nm and a down track direction of 9 nm was disposed at a track pitch of 20 nm and a bit pitch of 12.5 nm. In the gap 21 between the patterns, SiO x was embedded. Magnetic recording was performed using a spin stand with a head medium relative speed of 20 m / s, a magnetic spacing of 5 nm, and a track pitch of 20 nm, and this was reproduced by a GMR head having a shield interval of 20 nm.
- the recording head and the recording medium described above were incorporated into the magnetic disk device shown in FIGS. 13A and 13B, and performance evaluation was performed. As a result, 1.0 Tbyte ( An information recording / reproducing apparatus using a high-frequency rotating magnetic field having a total recording capacity of 4 Tbytes was obtained. Since the double-layer medium used in this example performs writing at a recording frequency matched to the upper layer portion 17 having a small magnetic anisotropy, the lower layer portion 18 having a large magnetic anisotropy has a larger magnetic anisotropy. Thus, a higher recording density can be achieved. At this time, the width w for determining the track density in FIG. 12B may be reduced and written on a recording medium having a higher density pattern.
- a perpendicular magnetic anisotropy body A spin injection layer 308, a metal nonmagnetic spin conduction layer 303, an FGL (magnetization high-speed rotator) 302, a metal nonmagnetic spin scatterer 312 and a layer adjacent to the high-frequency drive electrode 322.
- the magnetic recording layer 316, the nonmagnetic spin transfer layer 313, and the perpendicular magnetic anisotropy B (detection layer) 320 reach the detection electrode 321.
- the perpendicular magnetic anisotropy A308 to the perpendicular magnetic anisotropy B320 are columnar structures extending in the vertical direction of the drawing and have a substantially square cross section.
- the length of one side of the square was 10 nm.
- the perpendicular magnetic anisotropy A (spin injection layer) 308 and the perpendicular magnetic anisotropy B (detection layer) 320 have large perpendicular magnetic anisotropy in the vertical direction of the drawing, and are magnetized in the initial stage. After that, the direction of magnetization does not change.
- the magnetization directions of the perpendicular magnetic anisotropy body A308 and the perpendicular magnetic anisotropy body B320 are shown in the same direction, but the perpendicular magnetic anisotropy body A308 and the perpendicular magnetic anisotropy body B320 are shown. It is also possible to reverse the direction by changing the magnitude of the magnetic anisotropy magnetic field and controlling the magnetization magnetic field. When the magnetization is reversed, the influence of the magnetic field on the outside by the recording / reproducing apparatus according to the present invention is reduced.
- CoCrPt alloys having a perpendicular magnetic anisotropy field of 0.8 MA / m (10 kOe) to 1.2 MA / m (15 kOe) were used.
- FGL302 was a CoFe alloy having a thickness of 25 nm that has a large saturation magnetization and almost no magnetocrystalline anisotropy.
- the magnetization rotation is stabilized and good oscillation characteristics are obtained. It is done.
- the magnetization rotates at high speed in a plane along the layer, and the leakage magnetic field from the magnetic pole appearing on the side surface acts on the magnetization recording layer 316 as a high frequency magnetic field.
- the magnetization rotation driving force of the FGL 302 is a spin torque caused by spins injected or reflected from the perpendicular magnetic anisotropy A (spin injection layer) 308 through the metal nonmagnetic spin conduction layer 303.
- the injection or reflection of spin depends on the direction of current applied between the high-frequency drive electrode 322 and the metal nonmagnetic spin scatterer 312. As the current increases, the spin torque increases and the oscillation frequency of the FGL 302 increases. Furthermore, since the direction of magnetization rotation of the FGL 302 changes depending on the direction of the current, the direction of rotation of the circularly polarized high-frequency magnetic field changes, and the magnetization switch of the magnetization recording layer 316 can be controlled.
- the spin torque action increases when a CoFeB layer having a high polarizability is inserted about 1 nm between the metal nonmagnetic spin conductive layer 303 and the adjacent layer.
- 2 nm-Cu is used for the metal nonmagnetic spin conductive layer 303
- Ru or the like which is a metal nonmagnetic material with high spin conductivity, may be used.
- CoIr is used as the negative perpendicular magnetic anisotropy 311
- the epitaxial growth of the perpendicular magnetic anisotropy A 308, the metal nonmagnetic spin conduction layer 303, and the negative perpendicular magnetic anisotropy 311 is achieved when Ru is used. Can be expected.
- the metal non-magnetic spin scatterer 312 has a function of blocking the interaction between the FGL 302 and the magnetization recording layer 316 due to the spin, and between the high-frequency drive electrode 322 as a ground electrode and between the write circuit and the detection electrode 321. A detection circuit is formed.
- the metal nonmagnetic spin scatterer 312 3 nm-Pt was used. Even if Pd is used, the same effect is obtained.
- the magnetic recording layer 316 is too thick, it is difficult to be affected by the magnetic field of the FGL 302, so it is necessary to suppress the length to one side of a square that is a cross section.
- the magnetization recording layer 316 needs to keep recording magnetization against thermal fluctuation. Therefore, perpendicular magnetic anisotropy energy equal to or higher than that of the above-described perpendicular magnetic anisotropy A308 and perpendicular magnetic anisotropy B320 is required.
- a 6 nm- (Co / Pt) artificial lattice layer of 2.8 MA / m (34 kOe) is used, but an FePt or CoPt alloy may be used.
- the resistance change of the current flowing through the nonmagnetic spin transfer layer 313 to the perpendicular magnetic anisotropy B (detection layer) 308 may be observed as a TMR or GMR effect.
- TMR effect it is preferable to use MgO as the nonmagnetic spin transfer layer 313, and using the GMR effect as Cu as the nonmagnetic spin transfer layer 313.
- FIGS. 15A to 15E show a case of 3 ⁇ 3 as an example, but there is no problem in principle even if an arbitrary number of lattices are formed.
- the patterns of the FGL 302, the metal nonmagnetic spin conduction layer 303, the perpendicular magnetic anisotropy A308, the negative perpendicular magnetic anisotropy 311, the nonmagnetic spin transfer layer 313, the magnetization recording layer 316, and the perpendicular magnetic anisotropy B320 are as follows. As shown in FIG. 15E, a 10 nm square and a 25 nm pitch lattice are assembled, and the recording density is 1 Tbit per square inch.
- the recording / reproducing element described above was formed in a 0.25 mm ⁇ 0.25 mm area (10000 ⁇ 10000 elements) and performance evaluation was performed. As a result, a 10 Mbyte magnetic memory having an average writing time of 3 ns was obtained.
- 15B to 15D show electrode patterns of the high-frequency drive electrode 322, the metal nonmagnetic spin scatterer 312, and the detection electrode 321, respectively.
- the high-frequency drive electrode 322 and the metal nonmagnetic spin scatterer 312 corresponding to the recording bit are selected, and a current is passed in a required direction.
- the detection electrode 321 corresponding to the recording bit and the metal nonmagnetic spin scatterer 312 are selected, and the magnetization direction is determined by measuring the resistance value that changes depending on the direction of the current.
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Abstract
Description
2 FGL
3 金属非磁性スピン伝導層
4 垂直磁気異方性体B(スピン注入層)
5 主磁極
6 対向磁極
7 記録媒体
8 リップ
11 負の垂直磁気異方性体
12 金属非磁性スピン散乱体
13 対向磁極側リップ
14 サイドシールド
15 金属非磁性スピン伝導層
16 記録層
17 上部記録層
18 下部記録層
19 基板
21 パターン間の間隙
56 第1の上部記録層
57 第2の上部記録層
58 下部記録層
65 第1の上部記録層
66 第2の上部記録層
67 第3の上部記録層
200 記録ヘッド
201 高周波磁界発生器
202 高周波磁界検出器
203 高周波磁界検出器
205 コイル
206 補助磁極
207 GMR素子
208 シールド膜
209 絶縁膜
25 プラス電極
26 マイナス電極
27 プラス電極
28 マイナス電極
31 反強磁性層
32 固定磁性相
33 CoFeB
35 絶縁層(MgO)
36 CoFeB
37 自由層
101 記録媒体
102 スライダ
103 ロータリアクチユエータ
104 回転軸受け
105 アーム
106 サスペンション
108 筐体
109 記録再生部
302 FGL
303 金属非磁性スピン伝導層
312 金属非磁性スピン散乱体
308 垂直磁気異方性体A(スピン注入層)
311 負の垂直磁気異方性体
313 非磁性スピン伝達層
316 磁化記録層
320 垂直磁気異方性体B(検出層)
321 検出電極
322 高周波駆動電極
Claims (8)
- 高周波磁界を照射して記録媒体を磁気共鳴状態とし、磁化反転磁界を低減して情報を記録する情報記録装置において、
当該高周波磁界は、反転させようとする媒体磁化の歳差運動の回転方向と同一である円偏光回転磁界であることを特徴とする情報記録装置。 - ユーザデータが格納される磁気記録媒体と、当該磁気記録媒体に記録動作を行う記録ヘッド部を備えた磁気ヘッドとを有し、高周波磁界と前記ユーザデータに対応する記録磁界とを前記磁気記録媒体に印加することで該磁気記録媒体に磁気共鳴状態を形成して記録を行う情報記録装置において、
前記記録ヘッドは、
前記記録磁界を発生する記録磁極と、
該記録磁極のトレーリング側ないしリーディング側に、該記録磁極から離間して設けられた対向磁極と、
当該記録磁極と前記対向磁極の間に設けられた、前記高周波磁界を発生する多層膜とを有し、
当該多層膜は、前記磁気記録媒体に対する対向面側のトラック方向端部に形成された後退部を備えることを特徴とする情報記録装置。 - 請求項2に記載の情報記録装置において、
前記後退部は、前記トラック方向端部に設けられたテーパ部により構成されることを特徴とする情報記録装置。 - 請求項2に記載の情報記録装置において、
前記後退部は、前記トラック方向端部に設けられた段差部により構成されることを特徴とする情報記録装置。 - ユーザデータが格納される磁気記録媒体と、当該磁気記録媒体に記録動作を行う記録ヘッド部を備えた磁気ヘッドとを有し、高周波磁界と前記ユーザデータに対応する記録磁界とを前記磁気記録媒体に印加することで該磁気記録媒体に磁気共鳴状態を形成して記録を行う情報記録装置において、
前記記録ヘッドは、
前記記録磁界を発生する記録磁極と、
該記録磁極のトレーリング側ないしリーディング側に、該記録磁極から離間して設けられた対向磁極と、
当該記録磁極と前記対向磁極の間に設けられた、前記高周波磁界を発生する多層膜とを有し、
当該多層膜の浮上面形状が、上辺が前記記録磁極側である台形形状であることを特徴とする情報記録装置。 - 請求項1~5のいずれか1項に記載の情報記録装置において、
前記磁気記録媒体が、ディスクリートトラック媒体であることを特徴とする情報記録装置。 - 請求項1~5のいずれか1項に記載の情報記録装置において、
前記磁気記録媒体が、ビットパタン媒体であることを特徴とする情報記録装置。 - ユーザデータが格納される磁気記録媒体と、当該磁気記録媒体に記録動作を行う記録ヘッド部を備えた磁気ヘッドとを有し、高周波磁界と前記ユーザデータに対応する記録磁界とを前記磁気記録媒体に印加することで該磁気記録媒体に磁気共鳴状態を形成して記録を行う情報記録装置において、
前記記録ヘッドは、
前記記録磁界を発生する記録磁極と、
該記録磁極のトレーリング側ないしリーディング側に、該記録磁極から離間して設けられた対向磁極と、
当該記録磁極と前記対向磁極の間に設けられた、前記高周波磁界を発生する多層膜とを有し、
前記多層膜は、FGLとスピン伝導層とスピン注入層を有し、電流は前記スピン注入層から前記FGLの方向に向かって流れるようにされていることを特徴とする情報記録装置。
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JP2010536817A JP5558365B2 (ja) | 2008-11-10 | 2009-11-10 | 情報記録装置 |
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JP2012104191A (ja) * | 2010-11-10 | 2012-05-31 | Hitachi Ltd | 磁気ヘッド及びそれを用いた磁気記録再生装置 |
JP2012119629A (ja) * | 2010-12-03 | 2012-06-21 | Toshiba Corp | スピントルク発振子、その製造方法、磁気記録ヘッド、磁気ヘッドアセンブリ、磁気記録装置 |
JP2012204682A (ja) * | 2011-03-25 | 2012-10-22 | Toshiba Corp | 磁気発振素子及びスピン波装置 |
JP2013047998A (ja) * | 2011-08-29 | 2013-03-07 | Hitachi Ltd | 高周波磁界アシスト垂直磁気記録ヘッド |
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Also Published As
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JP5760064B2 (ja) | 2015-08-05 |
JP2014006959A (ja) | 2014-01-16 |
US20110216436A1 (en) | 2011-09-08 |
JPWO2010053187A1 (ja) | 2012-04-05 |
JP5558365B2 (ja) | 2014-07-23 |
US8724260B2 (en) | 2014-05-13 |
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