WO2007129687A1 - 磁気記録媒体、その製造方法および磁気記録再生装置 - Google Patents
磁気記録媒体、その製造方法および磁気記録再生装置 Download PDFInfo
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- WO2007129687A1 WO2007129687A1 PCT/JP2007/059462 JP2007059462W WO2007129687A1 WO 2007129687 A1 WO2007129687 A1 WO 2007129687A1 JP 2007059462 W JP2007059462 W JP 2007059462W WO 2007129687 A1 WO2007129687 A1 WO 2007129687A1
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Classifications
-
- 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
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/64—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent
- G11B5/66—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent the record carriers consisting of several layers
- G11B5/676—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent the record carriers consisting of several layers having magnetic layers separated by a nonmagnetic layer, e.g. antiferromagnetic layer, Cu layer or coupling layer
- G11B5/678—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent the record carriers consisting of several layers having magnetic layers separated by a nonmagnetic layer, e.g. antiferromagnetic layer, Cu layer or coupling layer having three or more magnetic layers
-
- 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
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
- G11B5/7368—Non-polymeric layer under the lowermost magnetic recording layer
- G11B5/7369—Two or more non-magnetic underlayers, e.g. seed layers or barrier layers
- G11B5/737—Physical structure of underlayer, e.g. texture
Definitions
- Magnetic recording medium manufacturing method thereof, and magnetic recording / reproducing apparatus
- the present invention relates to a magnetic recording medium, a method for manufacturing the same, and a magnetic recording / reproducing apparatus using the magnetic recording medium.
- the perpendicular magnetic recording technique is attracting attention as a promising technique for realizing further surface recording density.
- the conventional longitudinal magnetic recording system magnetizes the medium in the in-plane direction, whereas the perpendicular magnetic recording system is characterized by magnetizing in the direction perpendicular to the medium surface. For this reason, it is considered that the influence of the self-demagnetization action that hinders the achievement of high linear recording density in the longitudinal magnetic recording method can be avoided, and it is considered suitable for higher density recording.
- a certain magnetic layer thickness can be maintained, it is considered that the influence of thermal magnetic relaxation, which is a problem in longitudinal magnetic recording, is relatively small.
- a perpendicular magnetic recording medium is formed on a nonmagnetic substrate in the order of an underlayer, an intermediate layer, a magnetic recording layer, and a protective layer.
- a lubricating layer is applied to the surface after forming a protective layer.
- a magnetic film called a soft magnetic underlayer is provided under the underlayer.
- the intermediate layer is formed for the purpose of further improving the characteristics of the magnetic recording layer.
- the underlayer is considered to adjust the crystal orientation of the intermediate layer and the magnetic recording layer and at the same time to control the shape of the magnetic crystal.
- the crystal structure of the magnetic recording layer is important. That is, in a perpendicular magnetic recording medium, the crystal structure of the magnetic recording layer often has a hep structure, but the (002) crystal plane is parallel to the substrate surface, in other words, the crystal c-axis. [002] It is important that the axes are arranged as vertically as possible in the vertical direction.
- the perpendicular magnetic recording medium has the advantage that a relatively thick magnetic recording layer can be used, the total film thickness of the laminated thin film of the entire medium tends to be thicker than the current longitudinal magnetic recording medium, For this reason, there is a drawback that it easily includes factors that disturb the crystal structure in the process of stacking the media.
- the Ru intermediate layer sufficiently separates the Co alloy crystals of the magnetic recording layer, it is usually 1 (For example, see Patent Document 2.) 0
- increasing the film thickness increases the crystal grain size of the Co alloy, which increases recording noise and increases recording noise. Will get worse.
- Patent Document 1 Japanese Patent Laid-Open No. 2001-6158
- Patent Document 2 Japanese Patent Laid-Open No. 2005-190517
- the present invention has been made in view of the above circumstances, and a magnetic recording medium capable of recording and reproducing high-density information by satisfying both the refinement of the grain size of the perpendicular magnetic recording layer and the perpendicular orientation.
- An object of the present invention is to provide a manufacturing method thereof and a magnetic recording / reproducing apparatus.
- a perpendicular magnetic recording medium having at least a backing layer, a base film, an intermediate layer, and a perpendicular magnetic recording film on a nonmagnetic substrate
- at least one of the intermediate layers has at least one of elements having a fee structure. It consists of an alloy material with one element as the main component and an element selected from the group of elements having the bcc structure, and combines the (111) -oriented crystal structure and the layered irregular lattice (stacking fault) by mixing the fee structure and the bcc structure.
- a magnetic recording medium characterized by having.
- a perpendicular magnetic recording medium having at least a backing layer, an underlayer, an intermediate layer, and a perpendicular magnetic recording film on a nonmagnetic substrate
- at least one of the intermediate layers has at least one of an element group having a fee structure It consists of an alloy material with one element as the main component and an element selected from an element group having a hep structure, and combines a (111) -oriented crystal structure with a layered irregular lattice (stacking fault) due to a mixture of the fee structure and the hep structure.
- a magnetic recording medium characterized by having.
- At least one of the intermediate layers has a group power consisting of Pt, Ir, Pd, Au, Ni, Al, Ag, Cu, Rh, Pb and Co.
- An alloy having a structure (1) The magnetic recording medium according to (1), wherein the magnetic recording medium is made of an alloy material of an element having a bcc structure selected from a group force consisting of Fe, Cr, V, W, Mo, and Ta.
- At least one of the intermediate layers is composed mainly of at least one selected from the group force consisting of Pt, Ir, Pd, Au, Ni, Al, Ag, Cu, Rh, Pb and Co
- the magnetic recording medium according to (2) comprising: an alloy having a structure; and an alloy material of an element having a hep structure selected from the group consisting of Y, Mg, Zn, Hf, Re, Os, and Ru .
- the sum of the proportions of the elements having at least one layer force fee structure in the intermediate layer is 20 atomic% or more and 95 atomic% or less.
- Magnetic recording media
- the intermediate layer is composed of an alloy material with at least one element group having at least one layer force fee structure as a main component and an element selected from the element group having bcc structure. , Al, Ga, In, T1), or group 14 element (C, Si, Ge, Sn, Pb) forces are selected. At least one element is added and the sum of the non-transition metal elements is 0.
- the magnetic recording medium according to any one of (1) and (3) to (5), characterized in that the content is ⁇ 30 atomic%.
- the intermediate layer is made of an alloy material with at least one element group having at least one layer force fee structure as a main component and an element selected from the element group having hep structure. , Al, Ga, In, T1), or group 14 element (C, Si, Ge, Sn, Pb) forces are selected. At least one element is added and the sum of the non-transition metal elements is 0.
- the magnetic recording medium according to any one of (2) to (5), characterized in that the content is ⁇ 30 atomic%.
- the intermediate layer has a particle size of 3 nm or more and 10 nm or less.
- the magnetic recording medium according to any one of 1).
- At least one element group of the intermediate layer having a fee structure of at least one layer as a main component, an element group force having a bcc structure as an alloy material force with a selected element, and a hexagonal close-packed
- the magnetic recording medium according to any one of (1) to (13), wherein Ru, Re, a Ru alloy, or a Re alloy having a structure (hep) is (002) crystal plane oriented. .
- At least one element group having at least one layer force fee structure of the intermediate layer as a main component, element group force having hep structure, alloy material force with the selected element, and hexagonal close-packed The magnetic recording medium according to any one of (1) to sol (13), which has a structure (hep) and is (002) crystal plane oriented.
- At least one of the intermediate layers is also an alloy material force of an element having Cr and a fee structure, and the composition of Cr is 10 atomic% or more and 90 atomic% or less (1) or (16 The magnetic recording medium according to any one of 1).
- At least one of the intermediate layers is made of a Pt—Cr alloy material, and the Cr composition is not less than 15 atomic% and not more than 75 atomic%.
- At least one of the intermediate layers is made of an IrCr alloy material, and the Cr composition is 20 atomic% or more and 80 atomic% or less. Magnetic listed recoding media.
- the ratio of at least one layer force Pt of the intermediate layer is 20 atomic% to 90 atomic%, and the transition metal element group: Ti, V, Cr, Fe, Zr, Nb, Mo, Ru, Hf, Ta
- the ratio of at least one layer force Pd of the intermediate layer is 20 atomic% to 90 atomic%, and the transition metal element group: Ti, V, Cr, Fe, Zr, Nb, Mo, Ru, Hf, Ta
- the ratio of at least one layer force Ir of the intermediate layer is 20 atomic% to 90 atomic%, and transition metal element groups: Ti, V, Cr, Fe, Zr, Nb, Mo, Ru, Hf, Ta,
- the magnetic recording medium according to any one of (1) to (16), wherein the magnetic recording medium is an alloy material to which at least one element selected from W, Re, and Os is added.
- the ratio of at least one layer force Au of the intermediate layer is 25 atomic% to 85 atomic%, and the transition metal element group: Ti, V, Cr, Fe, Zr, Nb, Mo, Ru, Hf, Ta
- the ratio of at least one layer force Ni in the intermediate layer is 30 atomic% to 95 atomic%, and the transition metal element group: Ti, V, Cr, Fe, Zr, Nb, Mo, Ru, Hf, Ta
- a nonmagnetic substrate having at least a backing layer, an underlayer, an intermediate layer, and a perpendicular magnetic recording layer
- at least one of the intermediate layers has a layered irregular lattice (stacking fault) by adding an element having a bcc structure or a hep structure to an element having a fee structure.
- 111 A method of manufacturing a magnetic recording medium, characterized by having an oriented crystal structure.
- a magnetic recording / reproducing apparatus comprising a magnetic recording medium and a magnetic head for recording / reproducing information on the magnetic recording medium, wherein the magnetic recording medium is any one of (1) to (26).
- a magnetic recording / reproducing apparatus which is a magnetic recording medium described above.
- the crystal structure of the perpendicular magnetic layer in particular, the crystal of the hep structure, the c-axis is oriented with a very small angular dispersion with respect to the substrate surface, and the crystal grains constituting the perpendicular magnetic layer It is possible to provide a perpendicular magnetic recording medium having an extremely fine average particle diameter and excellent in high recording density characteristics.
- FIG. 1 is a diagram showing a cross-sectional structure of a perpendicular magnetic recording medium of the present invention.
- FIG. 2 is a view showing the (111) plane orientation of the fcc structure.
- FIG. 3 is a diagram showing a structure of a perpendicular magnetic recording / reproducing apparatus of the present invention.
- FIG. 4 is a diagram showing an X-ray diffraction intensity curve of the intermediate layer of the present invention.
- the perpendicular magnetic recording medium 10 of the present invention comprises at least a soft magnetic backing layer 2 on a nonmagnetic substrate 1 and an underlayer constituting an orientation control layer for controlling the orientation of the film immediately above. 3 and an intermediate layer 4, a perpendicular magnetic recording medium having a magnetic easy axis (crystal c axis) oriented perpendicularly to the substrate 5 and a protective layer 6, wherein the orientation control layer has a plurality of layers.
- the substrate side force also includes an underlayer 3 and an intermediate layer 4. It can also be applied to new perpendicular recording media such as ECC media, discrete track media, and pattern media, where further improvement in recording density is expected in the future.
- the nonmagnetic substrate used in the magnetic recording medium of the present invention includes an A1 alloy substrate such as an Al-Mg alloy such as Al-Mg alloy, ordinary soda glass, aluminosilicate glass, and amorphous glass.
- Any nonmagnetic substrate can be used as long as it is a non-magnetic substrate, such as a substrate made of silicon, titanium, ceramics, sapphire, quartz, or various types of resin.
- glass substrates such as A1 alloy substrates, crystallized glass, and amorphous glass are often used.
- a mirror polished substrate or a low Ra substrate such as Ra 1A is preferred. If it is mild, it may have a texture.
- the substrate is usually first washed and dried.
- the substrate is washed and dried before formation. Is desirable.
- the cleaning includes cleaning by etching (reverse sputtering) that is performed only by water cleaning.
- the substrate size is not particularly limited.
- the soft magnetic underlayer is provided in many perpendicular magnetic recording media.
- the recording magnetic field from the head is guided and the perpendicular component of the recording magnetic field is efficiently applied to the magnetic recording layer.
- any material having moderate soft magnetic properties such as FeCo alloy, CoZrNb alloy, CoTaZr alloy can be used.
- the soft magnetic layer has an amorphous structure. By adopting an amorphous structure, it becomes possible to prevent the surface roughness: Ra from increasing and reduce the flying height of the head. This is because higher recording density can be achieved.
- the total thickness of the backing layer is approximately 20 nm to 120 nm. The thickness is appropriately determined according to the balance between the force recording / reproducing characteristics and the OW characteristics.
- an orientation control layer for controlling the orientation of the film immediately above is provided on the soft magnetic backing layer.
- the orientation control layer is composed of a plurality of layers, and is called an underlayer and an intermediate layer from the substrate side.
- the underlayer preferably has a hep structure, a fee structure, a hexagonal covalent bond material, or an amorphous structure, and the average crystal grain size of the underlayer is in the range of 6 nm to 20 nm. It is preferable to do this.
- the intermediate layer of the present invention is used for efficiently perpendicularly orienting the magnetic recording layer.
- the intermediate layer material is composed of an element having a fee structure and an element having a bcc structure, or an alloy of an element having a hep structure, and has a (111) -oriented crystal structure, a fee structure, a bcc structure, or a hep structure It is preferable to combine layered irregular lattices (stacking faults) due to mixing.
- the fee structure, bcc structure, and hep structure as the intermediate layer material defined in the present invention are, of course, in an environment where the magnetic recording medium of the present invention is actually used in view of the gist of the present invention.
- the crystal structure that is, the crystal structure at room temperature.
- the (111) plane orientation of the fee structure means that three layers (A, B, C) with atoms arranged on one surface in a close-packed manner overlap each other as shown in Fig. 2 ( A ⁇ B ⁇ C ⁇ A ⁇ B ⁇ C ⁇ A ⁇ ' ⁇ ).
- a ⁇ B ⁇ C ⁇ A ⁇ B ⁇ C ⁇ A ⁇ ' ⁇ When a bcc or hep structure element is mixed here, a periodicity shift of A ⁇ B ⁇ C occurs, causing stacking faults (eg A ⁇ B ⁇ C ⁇ A ⁇ C ⁇ A ⁇ B). ⁇ C ⁇ , ... This stacking fault can be observed with a transmission electron microscope (TEM), etc.
- TEM transmission electron microscope
- a diffraction peak is observed on the low angle side at an angle that does not appear from the disappearance rule of the fee structure (violation of the disappearance rule of the fee) TEM image power No periodicity is observed in the stacking fault, and the intensity of the diffraction peak Since it is thought that stacking faults occur many times, this is called a layered irregular lattice.
- the (002) plane orientation of the hep structure which is the close-packed structure as the fee structure, is a stack of two layers of A and B ( ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ .
- the C layer is completely absent due to stacking faults. It is considered that the layered irregular lattice generated by mixing with elements of the bcc structure or hep structure is located between the (111) orientation of the fee structure and the (002) orientation of the hep structure.
- the control of the orientation of the intermediate layer is extremely important in the production of a perpendicular magnetic recording medium.
- the crystal grain size of the magnetic recording layer continuously formed on the intermediate layer also takes over the shape and immediately magnetic recording.
- the crystal grains in the layer are often finer. The smaller the crystal grain size of the magnetic recording layer, the higher the signal-to-noise intensity ratio (SNR).
- Axis symmetry also exists in the 111>, ⁇ 1 11>, and 11-11> directions.
- those other than 111> in the direction normal to the substrate surface have a stacking fault caused by mixing bcc or hep structure elements. Is lost.
- the intermediate layer having both (defects) only 111> axial symmetry is obtained.
- the magnetic recording layer laminated on the intermediate layer also grows with axial symmetry only in the direction normal to the substrate, so that the crystal c-axis [002] axis is efficiently vertically aligned.
- a perpendicular magnetic recording medium as a method for evaluating whether or not the crystal c-axis [002] axis of the magnetic recording layer is arranged in the direction perpendicular to the substrate with as little disturbance as possible, A price range can be used.
- the film formed on the substrate is applied to an X-ray diffractometer to analyze the crystal plane parallel to the substrate surface. By scanning the X-ray incident angle, a diffraction peak corresponding to the crystal plane is observed.
- the hep structure is oriented so that the c-axis [002] direction is perpendicular to the substrate surface, so a peak corresponding to the (002) plane is observed. .
- the optical system is swung with respect to the substrate surface while maintaining the Bragg angle diffracting the (002) plane. If the diffraction intensity of the (002) plane is plotted against the angle at which the optical system is tilted, a diffraction intensity curve centered on a swing angle of 0 ° can be drawn. This is called a rocking curve.
- (002) face is The force that produces a rocking curve with a sharp shape when aligned very parallel to the substrate surface
- a broad curve is obtained when the orientation of the (002) plane is widely dispersed. Therefore, the full width at half maximum of the rocking curve ⁇ (delta) ⁇ 50 is often used as an index of the quality of the crystal orientation of the perpendicular magnetic recording medium.
- the alloying force of an element having a fee structure and an element having a bcc structure or hep structure becomes a (111) -oriented crystal structure and a mixture of the fee structure and the bcc structure or hep structure.
- the material of the intermediate layer of the present invention is preferably a material in which the wettability of the magnetic recording layer to the Co-based alloy intermediate layer is not so great.
- the diffusion coefficient: S C which is a parameter indicating the wettability of Co (Liquid) on the intermediate layer (Solid). But-1/1 1 1 2) or + 20 [/ 1 1 1 2) as long as the material takes a value below, easily Co alloy magnetic recording layer to form a fine grain ⁇ .
- Co X is the surface free energy iZm 2 ) of X (Solid) and ⁇ is the surface free energy of Co (Liquid)
- Co-based alloy of gas recording layer can be grown epitaxially.
- the magnetic recording layer is literally a layer on which signals are actually recorded.
- Materials include CoCr, CoCrPt ⁇ CoCrPtB, CoCrPtB—X, CoCrPtB—X—Y, CoCrPt—0, CoCrP t-SiO, CoCrPt—CrO, CoCrPt—TiO CoCrPt—ZrO CoCrPt—Nb O
- Co-based alloy thin films such as CoCrPt-TaO CoCrPt-TiO are often used.
- the oxide surrounds the magnetic Co crystal grains and forms a dollar-yura structure, which weakens the magnetic interaction between Co crystal grains and reduces noise. To do.
- the crystal structure and magnetic properties of this layer determine the recording / reproducing characteristics.
- the magnetic recording layer has a dull-yura structure
- the oxide of the oxide magnetic layer is in the concave part of the intermediate layer surface. By gathering, it becomes a Dara-Yura structure.
- increasing the gas pressure may deteriorate the crystal orientation of the intermediate layer and increase the surface roughness. Therefore, the intermediate layer is divided into two layers and a low gas pressure film-forming layer and a high gas pressure component are formed. By dividing it into film layers, both orientation and surface irregularities can be maintained.
- the DC magnetron sputtering method or the RF sputtering method is used to form the above layers.
- RF bias, DC bias, pulse DC, pulse DC bias, 02 gas, H20 gas introduction, N2 gas can also be used.
- the sputtering gas pressure at that time is a force that is appropriately determined so as to optimize the characteristics for each layer.
- the sputtering gas pressure is controlled within a range of about 0.1 to 30 (Pa). It is adjusted while looking at the performance of the medium.
- the protective layer is for protecting the medium from damage caused by contact between the head and the medium.
- a carbon film, a SiO film, or the like is used. In many cases, a carbon film is used.
- the film thickness is about 1 nm to 10 nm, preferably about 2 to 6 nm, and more preferably 2 to 4 nm.
- the magnetic crystal is isolated by the oxide while maintaining the crystal orientation, and the magnetic field with less noise is isolated. It becomes possible to make a recording medium.
- FIG. 3 shows an example of a perpendicular magnetic recording / reproducing apparatus using the perpendicular magnetic recording medium.
- a magnetic recording / reproducing apparatus shown in FIG. 3 includes a magnetic recording medium 10 having the structure shown in FIG. 1, a medium driving unit 11 that rotationally drives the magnetic recording medium 10, and a magnetic head 12 that records and reproduces information on the magnetic recording medium 10. And a head drive unit 13 for moving the magnetic head 12 relative to the magnetic recording medium 10 and a recording / reproducing signal processing system 14.
- the recording / playback signal processing system 14 processes data input from the outside and sends the recording signal to the magnetic head 12, and processes the playback signal from the magnetic head 12 and sends the data to the outside. Has become possible.
- the magnetic head 12 used in the magnetic recording / reproducing apparatus of the present invention includes not only an MR (Magneto Resistance) element using an anisotropic magnetoresistance effect (AMR) as a reproducing element, but also a huge Magnetic heads suitable for higher recording densities, such as GMR elements using the magnetoresistive effect (GMR) and TuMR elements using the tunnel effect, can be used.
- MR Magnetic Magnetic Resistance
- AMR anisotropic magnetoresistance effect
- GMR magnetoresistive effect
- TuMR elements using the tunnel effect can be used.
- a soft magnetic backing layer CoNbZr is 50 (nm) by sputtering, NiTa having an amorphous structure as an underlayer is 5 (nm), and an Ar gas pressure is 0.6 (Pa). Each film was formed in an atmosphere.
- Pt—Cr, Ir—Cr, Pd which is an alloy material of Cr with an element having a fee structure
- Examples 1-1 to 4 The Cr mixing method was performed by rotating the substrate during film formation. The distance from the center of rotation of the substrate holder to the center of the substrate was 396 (mm), and the number of rotations of the substrate holder during film formation was 160 (rpm). During film formation, the Cr concentration in the film was controlled by arbitrarily adjusting the discharge output of the two targets. For the Cr alloy composition, the relationship between the film deposition rate of each target and the discharge output was investigated, and the discharge output, discharge time, and other forces during film formation were also calculated. The thickness of the intermediate layer was adjusted to 20 (nm).
- a 20 nm film was formed (Comparative Example 1 1-2).
- the gas pressure during film formation was Ar, 10 (Pa).
- Example 1 SNR, Hc, and delta ⁇ 50 parameters were improved with respect to the comparative example in Cr> 30 (%) of 1-4.
- the value of delta ⁇ 50 is slightly worse than Cr: 5 (%), but due to the increase in Cr content, stacking faults occur and lamellar irregular lattices cause the intermediate layer to have 111> axial symmetry only. It seems to have come to have. This is thought to have dramatically improved both the magnetostatic and electromagnetic properties.
- Table 2 The results are shown in Table 2.
- Example 2 a soft magnetic layer and an underlayer are formed on a glass substrate.
- An intermediate layer formed of 20 nm (Pt—Cr, Ir—Cr) was prepared (Examples 2-1 and 2).
- Pt, Cr and Ir were formed in the same manner as in Examples 2-1 and 2 (Comparative Examples 2-1 to 3).
- a magnetic recording layer and a C film were formed on the intermediate layer (Examples 2-1 and 2 and Comparative Examples 2-1 to 3).
- a peak appears in the range of 0 :: 34 to 65 (%), and in the range of Cr: 42 to 64 (%) from the right figure of Fig. 4, around 20 40 (°).
- This peak is a peak due to the layered irregular lattice.
- a soft magnetic layer is formed on a glass substrate.
- Ni having a fee structure was formed in an Ar atmosphere at 5 (nm) and a gas pressure of 0.6 (Pa).
- Pt—Ag, Pd—Ag, Ir—Ag, Au—Ag which is an alloy material of Ag, Cu that has the same FCC structure as Pt, Pd, Ir, Au, Ni, which has a fee structure
- Ni—Ag, Pt—Cu, Pd—Cu, Ir—Cu, Au—Cu, and Ni—Cu are each 10 (nm) at a gas pressure of 0.6 (Pa) ZlO (Pa), respectively, in Example 3 and Similarly, the film was formed by revolution film formation (Comparative Examples 3-1 to 10).
- Example 3 a soft magnetic layer and an underlayer are formed on a glass substrate.
- Pt and Pd having a fee structure were added with Group 6 elements such as Cr, Mo and W for a total of 40 (%).
- the film thickness was 10 (nm) at a gas pressure of 0.6 (Pa) / l 0 (Pa) as in Example 3 (Examples 4-1 to 12).
- Ru was prepared by adding a Group 6 element Cr, Mo, W in the same manner as in Example 4 (Comparative Examples 41 to 6). A magnetic layer and a protective film were formed on these as in Example 3 to obtain a magnetic recording medium.
- the average particle size was determined from the planar TEM image with the SNR, coercive force, and delta ⁇ 50 set.
- Table 9 lists the results of high signal-to-noise ratio: SNR, coercive force: Hc, delta ⁇ 50, and average particle size for each of Pt alloy, Pd alloy, and Ru alloy.
- a soft magnetic layer and an underlayer are formed on a glass substrate, Pt has a fee structure as an intermediate layer, Ni has the same FCC structure as Pd, and W is a Group 6 element. 30 (%). The amount of Ni added is 0, 20, 40 (%).
- the film thickness was 10 (nm) at a gas pressure of 0.6 (Pa) / 10 (Pa) as in Examples 3 and 4 (Examples 5-1 to 6).
- a film was formed by adding Ni to Ru, 0, 20, 40 (%) (Comparative Examples 51 to 3). On these, a magnetic layer and a protective film were formed in the same manner as in Examples 3 and 4 to obtain a magnetic recording medium.
- Example 6-1 As a comparative example, the FCC structure is formed on a film formed by depositing Ru or Re 10 (nm) at 0.6 (Pa) in the order opposite to that in Example 4.
- An alloy in which W (40)% Pd alloy was added at 10 (Pa) was prepared (Comparative Example 6-1-2). In the same manner as in Examples 3 to 5, a magnetic layer and a protective film were formed to obtain a magnetic recording medium.
- a soft magnetic layer and an underlayer were formed on a glass substrate, and Pd having a fee structure as an intermediate layer was 30 (%) in W, and further, group 13 element C or group 14 Group element Ga was added. The amount added is 0, 5, 10 (%).
- the film thickness was 10 (nm) with a gas pressure of 0.6 (? &) 710 &) (Examples 7-1 to 6).
- 0, 5, 10 (%) of Group 13 element C or Group 14 element Ga was added to Pd.
- the film thickness is the same as in the examples (Comparative Examples 7-1 to 6).
- a magnetic layer and a protective film were formed in the same manner as in Examples 3 to 6 to obtain a magnetic recording medium.
- a film having a thickness of 5 (nm) was prepared at a gas pressure of 10 (Pa) (Comparative Example 8-1 to 3).
- a magnetic layer and a protective film were formed in the same manner as in Examples 3 to 7 to obtain a magnetic recording medium.
- the present invention can be applied to a magnetic recording medium, a manufacturing method thereof, and a magnetic recording / reproducing apparatus using the magnetic recording medium.
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- Magnetic Record Carriers (AREA)
Abstract
Description
Claims
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US12/300,073 US20090147401A1 (en) | 2006-05-08 | 2007-05-05 | Magnetic recording medium, method of manufacturing the same, and magnetic recording/reproducing apparatus |
CN2007800164546A CN101438345B (zh) | 2006-05-08 | 2007-05-07 | 磁记录介质、其制造方法以及磁记录再生装置 |
JP2008514489A JP5061307B2 (ja) | 2006-05-08 | 2007-05-07 | 磁気記録媒体および磁気記録再生装置 |
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Cited By (8)
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WO2008096595A1 (en) * | 2007-02-06 | 2008-08-14 | Showa Denko K.K. | Perpendicular magnetic recording medium, method of manufacturing the medium and magnetic recording and reproducing apparatus |
WO2009096041A1 (en) * | 2008-01-31 | 2009-08-06 | Fujitsu Limited | Perpendicular magnetic recording media |
JP2009235511A (ja) * | 2008-03-27 | 2009-10-15 | Tanaka Kikinzoku Kogyo Kk | Pd−W系スパッタリングターゲット及びその製造方法 |
JP2010044813A (ja) * | 2008-08-11 | 2010-02-25 | Showa Denko Kk | 磁気記録媒体、その製造方法および磁気記録再生装置 |
JP2010044842A (ja) * | 2008-08-18 | 2010-02-25 | Showa Denko Kk | 磁気記録媒体、その製造方法および磁気記録再生装置 |
JP2010090412A (ja) * | 2008-10-03 | 2010-04-22 | Tanaka Holdings Kk | Pd−Cr−W系スパッタリングターゲット及びその製造方法 |
JP2012069230A (ja) * | 2010-08-26 | 2012-04-05 | Showa Denko Kk | 垂直磁気記録媒体及び磁気記録再生装置 |
JP2012211357A (ja) * | 2011-03-30 | 2012-11-01 | Tanaka Kikinzoku Kogyo Kk | Pd合金系スパッタリングターゲット及びその製造方法 |
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JP5616893B2 (ja) * | 2009-08-20 | 2014-10-29 | 昭和電工株式会社 | 熱アシスト磁気記録媒体及び磁気記憶装置 |
US20120099220A1 (en) * | 2010-10-21 | 2012-04-26 | Hitachi Global Storage Technologies Netherlands B. V. | Perpendicular magnetic recording medium (pmrm) and systems thereof |
JP5797398B2 (ja) * | 2010-12-16 | 2015-10-21 | 山陽特殊製鋼株式会社 | 磁気記録用Ni系合金及びスパッタリングターゲット材ならびに磁気記録媒体 |
US20130235490A1 (en) * | 2012-03-09 | 2013-09-12 | Hitachi Global Storage Technologies Netherlands B.V. | Perpendicular magnetic recording media with seed layer structure containing ruthenium (Ru) |
JP5961439B2 (ja) * | 2012-05-01 | 2016-08-02 | 昭和電工株式会社 | 熱アシスト磁気記録媒体及び磁気記録再生装置 |
JP5961490B2 (ja) * | 2012-08-29 | 2016-08-02 | 昭和電工株式会社 | 磁気記録媒体及び磁気記録再生装置 |
WO2014043701A1 (en) * | 2012-09-17 | 2014-03-20 | Xinghang Zhang | Method for producing high stacking fault energy (sfe) metal films, foils, and coatings with high-density nanoscale twin boundaries |
JP6081134B2 (ja) * | 2012-10-17 | 2017-02-15 | 株式会社日立製作所 | 垂直磁気記録媒体及び磁気記憶装置 |
JP2015111482A (ja) | 2013-12-06 | 2015-06-18 | 株式会社東芝 | 垂直磁気記録媒体、及び磁気記録再生装置 |
US9822441B2 (en) * | 2015-03-31 | 2017-11-21 | WD Media, LLC | Iridium underlayer for heat assisted magnetic recording media |
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- 2007-05-07 WO PCT/JP2007/059462 patent/WO2007129687A1/ja active Application Filing
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TW200818144A (en) | 2008-04-16 |
US20090147401A1 (en) | 2009-06-11 |
CN101438345A (zh) | 2009-05-20 |
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