WO2010106911A1 - 磁気記録媒体及び記憶装置 - Google Patents
磁気記録媒体及び記憶装置 Download PDFInfo
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- WO2010106911A1 WO2010106911A1 PCT/JP2010/053358 JP2010053358W WO2010106911A1 WO 2010106911 A1 WO2010106911 A1 WO 2010106911A1 JP 2010053358 W JP2010053358 W JP 2010053358W WO 2010106911 A1 WO2010106911 A1 WO 2010106911A1
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- 239000000696 magnetic material Substances 0.000 claims abstract description 12
- 239000006249 magnetic particle Substances 0.000 claims abstract description 12
- 238000007885 magnetic separation Methods 0.000 claims abstract description 11
- 239000002923 metal particle Substances 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 25
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 16
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 9
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 229910000929 Ru alloy Inorganic materials 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 175
- 239000013078 crystal Substances 0.000 description 26
- 239000000758 substrate Substances 0.000 description 11
- 239000006185 dispersion Substances 0.000 description 8
- 239000011241 protective layer Substances 0.000 description 8
- 230000001050 lubricating effect Effects 0.000 description 5
- 238000004544 sputter deposition Methods 0.000 description 5
- 238000002955 isolation Methods 0.000 description 4
- 230000005415 magnetization Effects 0.000 description 4
- 239000002356 single layer Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910000531 Co alloy Inorganic materials 0.000 description 2
- 229910003321 CoFe Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 229910019586 CoZrTa Inorganic materials 0.000 description 1
- 229910005435 FeTaN Inorganic materials 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010702 perfluoropolyether Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
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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
- G11B5/64—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
- G11B5/672—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 different compositions in a plurality of magnetic layers, e.g. layer compositions having differing elemental components or differing proportions of elements
Definitions
- the present invention relates to a magnetic recording medium and a storage device, and more particularly to a magnetic recording medium having a multi-layered recording layer and a storage device including such a magnetic recording medium.
- HDD Hard Disk Drive
- HDDs are used not only in computers but also in video recording devices, portable music players, and the like. As described above, since the HDD is used in various devices, there is a demand for further increase in capacity and size of the HDD.
- a general perpendicular magnetic disk has a soft magnetic backing layer of about 30 nm to 100 nm, a seed layer, an intermediate layer, a granular recording layer formed of a Co-based alloy and an oxide, and an oxide on a nonmagnetic substrate such as glass. It has a structure in which a Co-based alloy layer, a carbon protective layer, a lubricant, and the like that are not included are laminated.
- data is recorded on the perpendicular magnetic disk using a magnetic head. The magnetic flux generated from the magnetic head passes perpendicularly through the recording layer toward the backing layer and magnetizes the recording layer in the vertical direction.
- a nonmagnetic material that is an oxide is formed at the grain interface of the magnetic crystal grains, and the magnetic crystal grains are magnetically separated or isolated to reduce medium noise.
- the granular recording layer is also called a recording layer having a granular structure.
- the magnetic crystal grains forming the recording layer are made finer, uniform, and dispersed in crystal orientation. Reduction is necessary.
- the intermediate layer is formed of a Ru layer having a physical segregation structure
- the recording layer is formed of a granular recording layer containing an oxide
- the intermediate layer or the recording layer is further multilayered or a nonmagnetic granular layer is provided.
- the magnetic crystal grains are made finer and uniform, and the crystal orientation dispersion is reduced.
- the conventional magnetic recording medium has a problem that it is difficult to further improve the recording density because it is difficult to further reduce the crystal orientation dispersion by further miniaturizing and homogenizing the magnetic crystal grains in the recording layer. .
- an object of the present invention is to provide a magnetic recording medium and a storage device that can further improve the recording density.
- a non-magnetic granular layer and a recording layer provided on the non-magnetic granular layer are provided, and the recording layer is a first granular magnetic layer provided on the non-magnetic granular layer.
- a non-magnetic material having a second granular magnetic layer provided on the first granular magnetic layer and magnetically separating the metal particles of the non-magnetic granular layer, the magnetic particles of the first granular magnetic layer A magnetic recording medium different from the nonmagnetic material that magnetically separates the recording medium is provided.
- At least one magnetic recording medium and a magnetic head for writing information to and / or reading information from the magnetic recording medium
- the magnetic recording medium comprising a non-magnetic granular material.
- a recording layer provided on the nonmagnetic granular layer, wherein the recording layer is provided on the first granular magnetic layer provided on the nonmagnetic granular layer, and on the first granular magnetic layer.
- the non-magnetic material having the second granular magnetic layer and magnetically separating the metal particles of the non-magnetic granular layer is different from the non-magnetic material magnetically separating the magnetic particles of the first granular magnetic layer.
- a storage device is provided.
- the recording density can be further improved.
- the disclosed magnetic recording medium and storage device include a nonmagnetic granular layer and a recording layer provided on the nonmagnetic granular layer, and the recording layer includes a first granular magnetic layer provided on the nonmagnetic granular layer, and A second granular magnetic layer is provided on the first granular magnetic layer.
- the nonmagnetic material that magnetically separates the metal particles of the nonmagnetic granular layer is different from the nonmagnetic material that magnetically separates the magnetic particles of the first granular magnetic layer.
- the nonmagnetic material that magnetically separates the magnetic particles of the first granular magnetic layer is different from the nonmagnetic material that magnetically separates the magnetic particles of the second granular magnetic layer.
- the magnetic crystal grains forming the second granular magnetic layer can be further miniaturized and made uniform. Further, the crystal orientation dispersion can be further reduced. For this reason, it is possible to further improve the recording density.
- FIG. 1 is a sectional view showing the structure of a magnetic recording medium in the first embodiment of the present invention.
- the present invention is applied to a perpendicular magnetic recording medium.
- a perpendicular magnetic recording medium 10 includes a soft magnetic backing layer 12, an intermediate layer 13, a nonmagnetic granular layer 14, a first granular magnetic layer 15, a second granular magnetic layer 16, and a cap on a substrate 11.
- the layer 17, the protective layer 18, and the lubricating layer 19 are stacked.
- the granular magnetic layers 15 and 16 form the recording layer 101.
- the substrate 11 is made of a nonmagnetic material such as glass or aluminum alloy.
- the substrate 11 is required to have a flat surface and a relatively high mechanical strength.
- the soft magnetic backing layer 12 is formed of a soft magnetic material such as CoZrNb, CoZrTa, FeCoB, FeTaC, FeTaN, FeAlSi, FeCoAlO, CoNiFeB, CoFe 2 O 4 , ZnFe 2 O 4, or CoFe.
- a soft magnetic material such as CoZrNb, CoZrTa, FeCoB, FeTaC, FeTaN, FeAlSi, FeCoAlO, CoNiFeB, CoFe 2 O 4 , ZnFe 2 O 4, or CoFe.
- the intermediate layer 13 is provided for controlling the crystal orientation and crystal grain size of the nonmagnetic granular layer 14 and the granular recording layers 15 and 16 formed on the intermediate layer 13.
- the intermediate layer 13 is, for example, a laminated film (Ta / NiW / Ru film) in which Ta, NiW and Ru are laminated in this order from the bottom, or a laminated film (Ta / Ru film) in which Ta and Ru are laminated in this order from the bottom.
- it is formed of a laminated film (Ta / NiWCr / Ru film) in which Ta, NiWCr, and Ru are laminated in this order from the bottom.
- a Ru alloy may be used instead of Ru.
- the nonmagnetic granular layer 14 is provided to promote magnetic separation or isolation of the magnetic crystal grains of the recording layer 101.
- the nonmagnetic granular layer 14 is a granular structure, that is, a metal crystal particle having an easy axis of magnetization oriented perpendicular to the substrate surface is made of a nonmagnetic material such as SiO 2 , TiO 2 , Ta 2 O 3 , Cr 2 O 3 or the like. It has a magnetically separated structure.
- the nonmagnetic oxide used for the nonmagnetic material is SiO 2 , but is not limited to this.
- Both the first granular magnetic layer 15 and the second granular recording layer 16 have a granular structure. At least one of the granular magnetic layers 15 and 16 has a hard magnetic characteristic of 2 ⁇ 10 6 erg / cc or more, and is magnetized in the vertical direction by a magnetic field generated by a magnetic head (not shown) to obtain data. Hold.
- the granular magnetic layers 15 and 16 are made of CoCrPt—SiO 2 , CoPt—SiO 2 or the like.
- Each of the granular magnetic layers 15 and 16 has a granular structure, that is, a structure in which magnetic crystal grains are magnetically separated by a nonmagnetic material such as SiO 2 , TiO 2 , or Cr 2 O 3 .
- the nonmagnetic oxide used for the nonmagnetic material is SiO 2 , but the present invention is not limited to this, and a composite oxide such as SiO 2 , TiO 2 , Cr 2 O 3 may be used. .
- the cap layer 17 is made of a magnetic material that does not contain an oxide and has a non-granular structure.
- the protective layer 18 is formed of a material having a relatively high hardness, such as CN (carbon nitride), DLC (Diamond Like Carbon), or SiN (silicon nitride).
- the lubricating layer 19 is formed of, for example, a fluorine-based lubricant.
- a disk-shaped substrate 11 made of glass or aluminum alloy having a diameter of 2.5 inches is prepared.
- the substrate 11 is placed in a chamber of a DC magnetron sputtering apparatus, and the inside of the chamber is evacuated.
- a soft magnetic material such as CoZrNb is formed by sputtering to form a soft magnetic backing layer 12 on the substrate 11 to a thickness of 30 to 100 nm.
- the soft magnetic backing layer 12 may be formed by a plating method.
- the soft magnetic backing layer 12 for example, Ta is sputtered to a thickness of 1 nm, NiWCr is 3 nm to 8 nm, and Ru is 10 nm to 20 nm, and the intermediate layer 13 is formed by a laminated film (Ta / NiWCr / Ru film).
- the intermediate layer 13 is a laminated film (Ta / Ru film) of Ta having a thickness of about 1 nm and Ru having a thickness of 10 nm to 20 nm, or Ta having a thickness of about 3 nm and a thickness of about 3 nm to about 3 nm.
- a laminated film (Ta / NiW / Ru film) of 8 nm NiW and 10 nm to 20 nm thick Ru may be used.
- a layer having a CoCr—SiO 2 granular structure is formed on the intermediate layer 13 by sputtering, so that the nonmagnetic granular layer 14 is formed to a thickness of 1 nm to 5 nm, for example.
- a layer having a granular structure of, for example, CoCrPt—SiO 2 is formed on the nonmagnetic granular layer 14 by a two-layer sputtering method, thereby forming the granular magnetic layers 15 and 16 to have a total film thickness of, for example, 10 nm to 15 nm. To do.
- a cap layer 17 is formed on the second granular magnetic layer 16 by forming a magnetic material having a non-granular structure. Further, the protective layer 18 is formed on the cap layer 17 to a thickness of 3 nm to 5 nm, for example.
- the protective layer 18 is formed of CN, it can be formed by sputtering using carbon in an atmosphere containing Ar gas and N gas. Further, when the protective layer 18 is formed by DLC, it can be formed by using the CVD method, and when it is formed by SiN, it can be formed by using the sputtering method.
- the lubricating layer 19 is formed on the protective layer 18.
- the lubricating layer 19 is formed, for example, by applying perfluoropolyether, fluorinated alcohol or fluorinated carboxylic acid to a film thickness of 0.5 nm to 5 nm, for example.
- the inventors prepared samples S1 to S7 of the perpendicular magnetic recording medium 10 in which the cap layer 17 was not formed in this example by the above manufacturing method, and measured the magnetostatic characteristics of the samples S1 to S7.
- FIG. 2 is a diagram showing materials used for the nonmagnetic granular layer 14, the first granular magnetic layer 15, and the second granular magnetic layer 16 when the samples S1 to S7 are formed.
- CoCrPt—TiO 2 shown in FIG. 2 is Co 74 Cr 13 Pt 13 ⁇ 8TiO 2 with a thickness of 10 nm
- CoCrPt—SiO 2 is Co 66 Cr 13 Pt 21 ⁇ 8SiO 2 with a thickness of 2.5 nm
- CoCr—Cr 2 O 3 is Co 60 Cr 40 -6Cr 2 O 3 having a film thickness of 8 nm.
- the nonmagnetic granular layer 14 and the first granular magnetic layer 15 are not provided in the sample S7, and the recording layer 101 has a single-layer structure including only the second granular magnetic layer 16 of CoCrPt—TiO 2 .
- FIG. 3 is a diagram showing the magnetostatic characteristics measured for the samples S1 to S7.
- Hc (Oe) is the coercivity of each of the samples S1 to S7
- ⁇ Hs (Oe) is a parameter indicating crystal orientation dispersion in the recording layer 101
- ⁇ ′ is magnetic separation or isolation of the magnetic crystal grains in the recording layer 101. This is a parameter indicating conversion.
- the value of the coercive force Hc is desirably large, and the values of the parameters ⁇ Hs and ⁇ ′ are desirably small.
- the adjacent nonmagnetic granular layer 14 and the first and second granular magnetic layers 15 and 16 are all different in oxide species (or the oxides of the maximum contents of the respective layers 14 to 16 are all different).
- the coercive force Hc is increased and the parameters ⁇ Hs and ⁇ ′ are decreased.
- desirable characteristics can be obtained from the viewpoint of the magnetic characteristics of the magnetic recording medium 10.
- samples S3 and S4 it was confirmed that particularly desirable characteristics were obtained from the viewpoint of the magnetic characteristics of the perpendicular magnetic recording medium 10.
- sample S7 having a granular recording layer having a single layer structure it was confirmed that the coercive force Hc was small and the parameters ⁇ Hs and ⁇ ′ were large.
- the magnetic separation state (or isolation state) between the oxide phase and the metal phase of the granular material is set. Need to be good.
- the magnetic separation state of Co—SiO 2 or Co—Cr 2 O 3 is good, and the oxide of the nonmagnetic granular layer 14 is SiO 2 or Cr 2 O 3 is desirable.
- the oxide species of the nonmagnetic granular layer 14 and the first granular magnetic layer 15, more preferably the oxide species of the nonmagnetic granular layer 14, the first granular magnetic layer 15 and the second granular magnetic layer 16 are mutually connected.
- the magnetic crystal grains forming the second granular magnetic layer 16 can be further miniaturized and made uniform, and the crystal orientation dispersion can be further reduced.
- FIG. 4 is a sectional view showing the structure of the magnetic recording medium in the second embodiment of the present invention.
- the present invention is applied to a perpendicular magnetic recording medium having an ECC (Exchange-Coupled Composite) structure.
- ECC Exchange-Coupled Composite
- the recording layer 102 of the perpendicular magnetic recording medium 20 is a laminated structure formed by a first granular magnetic layer 15, a second granular magnetic layer 16, a coupling control layer 27, and a third granular magnetic layer 28.
- the nonmagnetic granular magnetic layer 14, the first granular magnetic layer 15, and the second granular magnetic layer 16 are made of different oxide species, thereby forming the second granular magnetic layer 16.
- the crystal grains can be further refined and homogenized, and the crystal orientation dispersion can be further reduced.
- the coupling control layer 27 the magnetization reversal field can be lowered, so that good recording can be performed even if a granular material having a large magnetic anisotropy is used for the recording layer 102.
- the nonmagnetic granular layer 14 is formed of Co 60 Cr 40 -6Cr 2 O 3 having a thickness of 3.5 nm
- the first granular magnetic layer 15 is Co 66 Cr 13 Pt having a thickness of 2.5 nm.
- 21 is formed by -8SiO 2
- the second granular magnetic layer 16 thickness is formed by Co 73 Cr 9 Pt 18 -8TiO 2 of 8.0 nm
- the film thickness coupling control layer 27 is 0.30 nm Ru 65 Co is formed by 35
- third granular magnetic layer 28 has a thickness of formed by Co 70 Cr 19 Pt 11 -8TiO 2 of 5.0 nm
- the capping layer 17 thickness is 7.0nm Co 70 Cr 19 Pt 8 B 3 is formed.
- FIG. 5 is a cross-sectional view showing the structure of the magnetic recording medium in the third embodiment of the present invention.
- the present invention is applied to a perpendicular magnetic recording medium having an ESM (Element Specific Specific) structure.
- ESM Expossion Specific Specific
- the recording layer 103 of the perpendicular magnetic recording medium 30 includes the first granular magnetic layer 15, the second granular magnetic layer 16, the third granular magnetic layer 37, the fourth granular magnetic layer 38, and the fifth granular magnetic layer. It has a laminated structure formed by the magnetic layer 39. Also in the case of this example, the magnetic crystal forming the second granular magnetic layer 16 is obtained by making the oxide species of the non-magnetic granular layer 14, the first granular magnetic layer 15, and the second granular magnetic layer 16 different from each other. This makes it possible to make the particles finer and uniform, and to further reduce the crystal orientation dispersion.
- FIG. 6 is a plan view showing a part of the storage device according to the embodiment of the present invention with the upper cover removed.
- the storage device 500 includes a disk-shaped perpendicular magnetic recording medium 600, a spindle motor (not shown) that rotates the perpendicular magnetic recording medium 600 fixed to the hub 502, and a magnetic head 503 that writes and / or reads information. And a suspension 504 for holding the magnetic head 503, an actuator 507 for driving and controlling the suspension 504 in the radial direction of the perpendicular magnetic recording medium 600, and the like.
- the perpendicular magnetic recording medium 600 has the structure of any of the perpendicular magnetic recording media 10, 20, and 30 described in the first, second, and third embodiments.
- the magnetic head 503 is levitated from the surface of the perpendicular magnetic recording medium 600 by a certain flying height by the air flow generated by the rotation of the perpendicular magnetic recording medium 600.
- the actuator 507 moves the magnetic head 503 in the radial direction P of the perpendicular magnetic recording medium 200, and information is written to and / or read from the perpendicular magnetic recording medium 600.
- the perpendicular magnetic recording medium 600 provided in the storage device 500 has one of the structures of the perpendicular magnetic recording media 10, 20, and 30, high-density recording of data can be realized.
- the number of perpendicular magnetic recording media 600 provided in the storage device 500 may be one or plural.
- the perpendicular magnetic recording medium in each of the above embodiments is not limited to a so-called magnetic disk, and the present invention can be applied to various magnetic recording media including a magnetic recording card.
Abstract
Description
11 基板
12 軟磁性裏打ち層
13 中間層
14 非磁性グラニュラ層
15 第一グラニュラ磁性層
16 第二グラニュラ磁性層
17 キャップ層
18 保護層
19 潤滑層
101,102,103 記録層
500 記憶装置
503 磁気ヘッド
Claims (12)
- 非磁性グラニュラ層と、
前記非磁性グラニュラ層上に設けられた記録層を備え、
前記記録層は、前記非磁性グラニュラ層上に設けられた第一グラニュラ磁性層と、前記第一グラニュラ磁性層上に設けられた第二グラニュラ磁性層を有し、
前記非磁性グラニュラ層の金属粒子を磁気的に分離する非磁性材料が、前記第一グラニュラ磁性層の磁性粒子を磁気的に分離する非磁性材料とは異なる、磁気記録媒体。 - 前記第一グラニュラ磁性層の磁性粒子を磁気的に分離する非磁性材料が、前記第二グラニュラ磁性層の磁性粒子を磁気的に分離する非磁性材料とは異なる、請求項1記載の磁気記録媒体。
- 前記非磁性グラニュラ層、前記第一グラニュラ磁性層及び前記第二グラニュラ磁性層の各層が前記磁気的に分離に用いる非磁性材料は、SiO2、TiO2及びCr2O3からなるグループから選択された酸化物である、請求項1記載の磁気記録媒体。
- 前記第一グラニュラ磁性層及び前記第二グラニュラ磁性層のうち少なくとも一方は、2×106erg/cc以上の硬磁性な磁気特性を有する、請求項1記載の磁気記録媒体。
- 軟磁性材料で形成された軟磁性裏打ち層と、
Ru又はRu合金で形成され、前記軟磁性裏打ち層上に設けられた中間層を更に備え、
前記非磁性グラニュラ層は前記中間層上に設けられている、請求項1乃至4のいずれか1項記載の磁気記録媒体。 - 前記第二グラニュラ磁性層の上方に設けられた一又は複数の第三グラニュラ磁性層を更に備えた、請求項5記載の磁気記録媒体。
- 前記第二グラニュラ磁性層と前記第三グラニュラ磁性層の間に設けられた結合制御層を更に備えた、請求項6記載の磁気記録媒体。
- 少なくとも1つの磁気記録媒体と、
前記磁気記録媒体に情報を書き込み及び/又は前記磁気記録媒体から情報を読み出す磁気ヘッドを備え、
前記磁気記録媒体は、
非磁性グラニュラ層と、
前記非磁性グラニュラ層上に設けられた記録層を備え、
前記記録層は、前記非磁性グラニュラ層上に設けられた第一グラニュラ磁性層と、前記第一グラニュラ磁性層上に設けられた第二グラニュラ磁性層を有し、
前記非磁性グラニュラ層の金属粒子を磁気的に分離する非磁性材料が、前記第一グラニュラ磁性層の磁性粒子を磁気的に分離する非磁性材料とは異なる、記憶装置。 - 前記磁気記録媒体の前記第一グラニュラ磁性層の磁性粒子を磁気的に分離する非磁性材料が、前記第二グラニュラ磁性層の磁性粒子を磁気的に分離する非磁性材料とは異なる、請求項8記載の記憶装置。
- 前記磁気記録媒体の前記非磁性グラニュラ層、前記第一グラニュラ磁性層及び前記第二グラニュラ磁性層の各層が前記磁気的に分離に用いる非磁性材料は、SiO2、TiO2及びCr2O3からなるグループから選択された酸化物である、請求項8記載の記憶装置。
- 前記磁気記録媒体の前記第一グラニュラ磁性層及び前記第二グラニュラ磁性層のうち少なくとも一方は、2×106erg/cc以上の硬磁性な磁気特性を有する、請求項8記載の記憶装置。
- 前記磁気記録媒体は、軟磁性材料で形成された軟磁性裏打ち層と、Ru又はRu合金で形成され前記軟磁性裏打ち層上に設けられた中間層を更に備え、
前記非磁性グラニュラ層は前記中間層上に設けられている、請求項8乃至11のいずれか1項記載の記憶装置。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US13/257,227 US8722212B2 (en) | 2009-03-19 | 2010-03-02 | Magnetic recording medium with a non-magnetic granular layer under a plurality of granular magnetic layers and storage apparatus |
CN201080012061.XA CN102356430B (zh) | 2009-03-19 | 2010-03-02 | 磁记录介质及存储装置 |
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JP2009-069062 | 2009-03-19 | ||
JP2009069062A JP5377015B2 (ja) | 2009-03-19 | 2009-03-19 | 磁気記録媒体 |
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JP5740897B2 (ja) | 2010-10-04 | 2015-07-01 | ミツミ電機株式会社 | 発電装置及びスイッチ |
US9093101B2 (en) * | 2011-02-28 | 2015-07-28 | Seagate Technology Llc | Stack including a magnetic zero layer |
SG11201403399VA (en) | 2011-12-22 | 2014-07-30 | Seagate Technology Llc | Recording medium with thin stabilization layer having high magnetic saturation and anisotropic field characteristics |
JP2015099626A (ja) * | 2013-11-19 | 2015-05-28 | 株式会社東芝 | 磁気記録媒体とその製造方法、磁気記録再生装置 |
JP6767251B2 (ja) * | 2016-12-08 | 2020-10-14 | 昭和電工株式会社 | 磁気記録媒体の製造方法 |
JP6767256B2 (ja) * | 2016-12-21 | 2020-10-14 | 昭和電工株式会社 | 磁気記録媒体の製造方法 |
JP7160705B2 (ja) * | 2019-01-28 | 2022-10-25 | 株式会社東芝 | 電磁波減衰体及び電子装置 |
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US8722212B2 (en) | 2014-05-13 |
US20120019959A1 (en) | 2012-01-26 |
JP2010225212A (ja) | 2010-10-07 |
CN102356430A (zh) | 2012-02-15 |
CN102356430B (zh) | 2014-12-03 |
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