WO2003100773A1 - Support d'enregistrement d'informations et dispositif de stockage d'informations - Google Patents
Support d'enregistrement d'informations et dispositif de stockage d'informations Download PDFInfo
- Publication number
- WO2003100773A1 WO2003100773A1 PCT/JP2002/005075 JP0205075W WO03100773A1 WO 2003100773 A1 WO2003100773 A1 WO 2003100773A1 JP 0205075 W JP0205075 W JP 0205075W WO 03100773 A1 WO03100773 A1 WO 03100773A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- control layer
- recording medium
- information recording
- layer
- unevenness
- Prior art date
Links
- 230000005291 magnetic effect Effects 0.000 claims abstract description 48
- 239000010408 film Substances 0.000 claims abstract description 28
- 239000000758 substrate Substances 0.000 claims abstract description 13
- 239000010409 thin film Substances 0.000 claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 10
- 229910052763 palladium Inorganic materials 0.000 claims description 9
- 239000011261 inert gas Substances 0.000 claims description 5
- 238000004544 sputter deposition Methods 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 4
- 229910052697 platinum Inorganic materials 0.000 claims description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 1
- 229910052710 silicon Inorganic materials 0.000 claims 1
- 239000010703 silicon Substances 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 62
- 230000000052 comparative effect Effects 0.000 description 5
- 230000005415 magnetization Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005381 magnetic domain Effects 0.000 description 4
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 229910017112 Fe—C Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000006249 magnetic particle Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000005546 reactive sputtering Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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
-
- 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
- G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
- G11B5/8404—Processes or apparatus specially adapted for manufacturing record carriers manufacturing base layers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
- Y10T428/264—Up to 3 mils
- Y10T428/265—1 mil or less
Definitions
- the present invention generally relates to information recording media, and more particularly to a perpendicular magnetic recording medium having a perpendicular magnetization film.
- the conventional recording method called the in-plane (longitudinal) recording method has a problem of thermal instability. Therefore, it is difficult to remarkably reduce the size of the magnetic particles. For this reason, a perpendicular magnetic recording system having an advantage in thermal magnetic relaxation and the like is being studied.
- a soft magnetic underlayer underlayer
- a perpendicular magnetic film is laminated on this soft magnetic underlayer with a nonmagnetic layer interposed. Medium is used.
- a method of using a CoZPd or Co / Pt multilayer film as a perpendicular magnetization film has been studied.
- These multilayer films are made by alternately laminating an ultra-thin magnetic film of 0.05 ⁇ m to 2 nm and an ultra-thin non-magnetic film of 0.1 nm to 5 nm. It shows extremely strong perpendicular magnetic anisotropy as compared with recording media using alloys, and is a promising perpendicular magnetic film candidate.
- the above-mentioned multilayer film has a problem that the medium noise is large because it is a continuous film.
- the cause of the medium noise is mainly transition noise or reverse domain noise due to magnetization reversal.
- the transition noise is derived from the grain boundary noise due to the magnetic crystal grains and the non-uniformity of the magnetization reversal near the boundary of the recording magnetic domain.
- the reverse magnetic domain noise is caused by the non-uniformity of the magnetic grains, the leakage magnetic field from the demagnetizing field of the recording film to the magnetization around the recording magnetic domain, and the like.
- a commonly used measure is to form a film structure in which adjacent magnetic grains are magnetically isolated from each other. By achieving magnetic isolation, noise from the medium (medium noise) is reduced, S / N is improved, and linear recording density can be improved.
- Magnetic properties change significantly due to isolation between adjacent magnetic grains. That is, coercivity The force increases and the slope ⁇ ( 47 ⁇ dM / d ⁇ ) near the coercive force of the M-H loop decreases (under ideal conditions.
- Co / Pd or Co / Pt multilayer magnetic films As a means for magnetically isolating adjacent magnetic grains, a method of forming a film by sputtering under a high gas pressure, a method of using a granular underlayer, and the like are known. Even if the method is used, it is not easy to form a short magnetic domain, and it is difficult to control magnetic properties by only one recording layer.
- an object of the present invention is to provide a perpendicular magnetic recording medium capable of increasing the coercive force of a magnetic recording layer, reducing medium noise and improving S / N.
- a substrate an unevenness control layer having unevenness with a particle size of 5 to 20 nm and an average roughness (R a) of 0.2 to 2.0 nm on a surface provided on the substrate,
- An orientation control layer provided on the irregularity control layer and containing at least 30 at% of a metal having a fee structure by itself; and a ferromagnetic thin film provided in contact with the orientation control layer.
- An information recording medium characterized by comprising: a magnetic recording layer having perpendicular magnetic anisotropy composed of a multilayer film in which thin films are alternately stacked.
- the metal having the fcc structure by itself which is the main component of the orientation control layer, is selected from the group consisting of Pd, Pt, Au, and Ag.
- the unevenness control layer is made of either silicon oxide or nitride.
- the silicon oxide constituting the unevenness control layer is formed by sputtering in a process gas atmosphere containing oxygen and an inert gas.
- Silicon nitride is formed by sputtering in a process gas atmosphere containing nitrogen and an inert gas.
- the magnetic recording layer is composed of a multilayer film selected from the group consisting of CoZPd, Co / Pt, and CoB / PdB, and the ferromagnetic thin film is 0.05 nm to 2 nm. with a thickness of 0.1 nm and a nonmagnetic thin film of 0.1 ⁇ ! It has a thickness of ⁇ 5 nm.
- FIG. 1 is a diagram showing a medium configuration of a first embodiment of the present invention
- Figure 2 shows the dependence of the force loop on the thickness of the Pd orientation control layer
- Figure 3 shows the dependence of Hc on the thickness of the Pd orientation control layer
- FIG. 4 is a diagram showing a medium configuration of a second embodiment of the present invention.
- FIG. 5 is a diagram showing the thickness dependence of the Pd orientation control layer of SZNm. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 shows a medium configuration of the first embodiment of the present invention.
- Perpendicular magnetic recording medium 2 was formed by a DC magnet.
- P d orientation control layer 8 was applied on the protective layer 12.
- the SiO 2 x concavo-convex control layer 6 was formed to a thickness of 10 nm by a reactive sputtering method using two types of gases, Ar and O 2 , as process gases.
- a process gas an inert gas such as Kr, Xe can be used instead of Ar. ..
- the unevenness control layer 6 has a concave / convex surface having a particle size of 0.5 ⁇ ⁇ 2 O n ⁇ and an average roughness (R a) of 0.22., O n. .
- As the Pd orientation control layer 8 three types of samples having a thickness of 2 nm, 5 nm, and 10 nm were formed by a D, _C.
- the Co / Pd multilayer recording layer 1.0 was formed by a DC magnetron sputtering method by alternately discharging Co and Pd in a rotating chamber of a substrate rotating type. A total of 16 layers of 0.2 nm thick Co and 1 nm thick Pd are alternately laminated, and a 19.2 nm thick Co / Pd multilayer recording layer 10 I got Also create S i 0 x directly on unevenness control layer 6 C o / P d multilayer recording layer 1 0 was formed sample was a comparative sample.
- the magnetic recording layer 10 is composed of a CoZPd multilayer film.
- the magnetic recording layer 10 is composed of a Co / Pt or CoB / PdB multilayer film. You may do so.
- the thickness of the ferromagnetic thin layer composed of ⁇ ⁇ 0 or CoB of the multilayer recording layer 10 is preferably in the range of 0.05 nm to 2 nm, and Pd, Pt, or Pd.
- the nonmagnetic thin layer of dB preferably has a thickness in the range of 0.1 nm to 5 nm.
- the orientation control layer 8 metals such as Pd, Pt, Au, and Ag having a fee structure by themselves, or alloys containing 30 at% or more of these metals can be used. Ti, Cr, Ru, etc. can be adopted as alloying elements.
- the unevenness control layer 6 is formed from SiO x, but may be formed from SiO x . In this case, a two-system gas of Ar and N 2 is used as a process gas, and a film is formed by reactive sputtering.
- Figure 2 shows the force loop of a sample in which the thickness of the Pd orientation control layer 8 was changed to 2 nm, 5 nm, and 10 nm '.
- a Kerr loop of a sample in which the Pd orientation control layer 8 is omitted and the Cp / Pd multilayer film recording layer 10 is directly formed on the SiO x unevenness control layer 6 is also shown.
- Fig. 3 shows the dependence of the coercive force (, Hc), obtained from the Kerr loop, on the thickness of the P: d
- Hc corresponds to the external magnetic field at a force of one rotation angle in FIG. As is clear from FIG.
- the coercive force (H e) increases as the thickness of the Pd orientation control layer 8 increases.
- a coercive force (H e) twice or more can be obtained as compared with the comparative sample in which the Pd orientation control layer 8 is omitted.
- Forming S i 0 x unevenness Forming a shroud 6 on the glass substrate 4 is effective for lowering the noise of the medium.
- Inserting the unevenness control layer 6 disperses the lattice of the crystal and disperses the alignment, deteriorating the orientation of the Co / Pd or Co / Pt multilayer film.
- there is a risk c C OZP d, or perpendicular magnetic anisotropy of the C o / Pt multilayer film is maximized when (1 1 1) orientation, the anisotropy dispersion occurs when are mixed grain other orientations However, this may cause medium noise.
- the orientation control layer 8 is inserted immediately below the multilayer recording layer 10.
- the orientation control layer 8 By inserting the orientation control layer 8 immediately below the multilayer recording layer 10, the (111) orientation of the Co / Pd or Co / Pt multilayer film is improved, and other orientation properties are improved. Strength decreases. This improves the perpendicular magnetic anisotropy and increases the coercive force (H e).
- FIG. 4 shows a medium configuration diagram of the second embodiment of the present invention.
- the same components as those of the perpendicular magnetic recording medium 2 of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted to avoid duplication.
- the perpendicular magnetic recording medium 2 ′ of the present embodiment has a 400 nm-thick Fe-C backing layer 16 formed on a glass substrate 4.
- the Fe—C backing layer 16 was formed by a cospar of Fe and carbon with a substrate rotating chamber.
- the C protective layer 1 2 ′ has a thickness of 2 nm.
- Figure 5 shows the S / Nm (media S / N) at a linear recording density of 200 kFCL when the thickness of the Pd orientation control layer 8 was changed to 0, 2 nm, 5 nm, and ⁇ ⁇ . Is shown.
- the S / Nm is 3 dB for the Pd orientation control layer 8 of 1 O nm compared to the comparative sample in which the Pd orientation control layer 8 is omitted. It is soiled.
- the S ′ N.m can be improved by inserting an orientation control layer immediately below the multilayer recording layer.
Landscapes
- Magnetic Record Carriers (AREA)
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02728146A EP1508895A4 (en) | 2002-05-24 | 2002-05-24 | INFORMATION RECORDING MEDIUM AND INFORMATION STORAGE DEVICE |
CNA028287681A CN1625769A (zh) | 2002-05-24 | 2002-05-24 | 信息记录媒体和信息存储装置 |
PCT/JP2002/005075 WO2003100773A1 (fr) | 2002-05-24 | 2002-05-24 | Support d'enregistrement d'informations et dispositif de stockage d'informations |
KR10-2004-7015433A KR20040105232A (ko) | 2002-05-24 | 2002-05-24 | 정보 기록 매체 및 정보 기억 장치 |
JP2004508340A JPWO2003100773A1 (ja) | 2002-05-24 | 2002-05-24 | 情報記録媒体及び情報記憶装置 |
US10/959,729 US20050042481A1 (en) | 2002-05-24 | 2004-10-06 | Information recording medium with improved perpendicular magnetic anisotropy |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2002/005075 WO2003100773A1 (fr) | 2002-05-24 | 2002-05-24 | Support d'enregistrement d'informations et dispositif de stockage d'informations |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/959,729 Continuation US20050042481A1 (en) | 2002-05-24 | 2004-10-06 | Information recording medium with improved perpendicular magnetic anisotropy |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003100773A1 true WO2003100773A1 (fr) | 2003-12-04 |
Family
ID=29561078
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/005075 WO2003100773A1 (fr) | 2002-05-24 | 2002-05-24 | Support d'enregistrement d'informations et dispositif de stockage d'informations |
Country Status (6)
Country | Link |
---|---|
US (1) | US20050042481A1 (ja) |
EP (1) | EP1508895A4 (ja) |
JP (1) | JPWO2003100773A1 (ja) |
KR (1) | KR20040105232A (ja) |
CN (1) | CN1625769A (ja) |
WO (1) | WO2003100773A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005222675A (ja) * | 2004-01-09 | 2005-08-18 | Tohoku Univ | 垂直磁気記録媒体 |
US8323808B2 (en) | 2004-01-09 | 2012-12-04 | Fuji Electric Co., Ltd. | Perpendicular magnetic recording medium |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080020238A1 (en) * | 2004-03-31 | 2008-01-24 | Hirotaka Tanaka | Magentic Disk and Glass Substrate for Magnetic Disk |
KR100829575B1 (ko) * | 2006-11-03 | 2008-05-14 | 삼성전자주식회사 | 패턴화된 자기 기록 매체 |
JP5775720B2 (ja) * | 2011-03-30 | 2015-09-09 | 昭和電工株式会社 | 磁気記録媒体の製造方法及び磁気記録再生装置 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05303734A (ja) * | 1992-03-30 | 1993-11-16 | Victor Co Of Japan Ltd | 垂直磁気記録媒体 |
JPH09282643A (ja) * | 1996-04-05 | 1997-10-31 | Sony Corp | 磁気記録媒体及びその製造方法 |
JPH101327A (ja) * | 1996-06-11 | 1998-01-06 | Hoya Corp | 記録媒体用ガラス基板、該基板を用いた磁気記録媒体及びその製造方法 |
JPH1081542A (ja) * | 1996-09-04 | 1998-03-31 | Hoya Corp | 情報記録媒体用基板に用いる材料、これを用いる基板及びこの基板を用いる磁気ディスク |
JPH10198941A (ja) * | 1996-12-29 | 1998-07-31 | Hoya Corp | 磁気記録媒体及びその製造方法 |
JP2001155329A (ja) * | 1999-11-30 | 2001-06-08 | Sony Corp | 磁気記録媒体 |
JP2002025032A (ja) * | 2000-06-30 | 2002-01-25 | Sony Corp | 磁気記録媒体 |
JP2002083417A (ja) * | 2000-09-07 | 2002-03-22 | Hitachi Maxell Ltd | 磁気記録媒体及びそれを用いた磁気記録装置 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US6214429B1 (en) * | 1996-09-04 | 2001-04-10 | Hoya Corporation | Disc substrates for information recording discs and magnetic discs |
JP3746791B2 (ja) * | 1997-04-30 | 2006-02-15 | 帝人株式会社 | 低帯電性複合ポリエステルフィルム |
US6562489B2 (en) * | 1999-11-12 | 2003-05-13 | Fujitsu Limited | Magnetic recording medium and magnetic storage apparatus |
WO2002054390A1 (fr) * | 2000-12-28 | 2002-07-11 | Hitachi Maxell, Ltd. | Support d'enregistrement magnetique et son procede de fabrication, dispositif de stockage magnetique |
US7166375B2 (en) * | 2000-12-28 | 2007-01-23 | Showa Denko K.K. | Magnetic recording medium utilizing a multi-layered soft magnetic underlayer, method of producing the same and magnetic recording and reproducing device |
US6677061B2 (en) * | 2001-05-23 | 2004-01-13 | Showa Denko Kabushiki Kaisha | Magnetic recording medium, production process thereof, and magnetic recording and reproducing apparatus |
-
2002
- 2002-05-24 KR KR10-2004-7015433A patent/KR20040105232A/ko not_active Application Discontinuation
- 2002-05-24 CN CNA028287681A patent/CN1625769A/zh active Pending
- 2002-05-24 WO PCT/JP2002/005075 patent/WO2003100773A1/ja not_active Application Discontinuation
- 2002-05-24 JP JP2004508340A patent/JPWO2003100773A1/ja not_active Withdrawn
- 2002-05-24 EP EP02728146A patent/EP1508895A4/en not_active Withdrawn
-
2004
- 2004-10-06 US US10/959,729 patent/US20050042481A1/en not_active Abandoned
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05303734A (ja) * | 1992-03-30 | 1993-11-16 | Victor Co Of Japan Ltd | 垂直磁気記録媒体 |
JPH09282643A (ja) * | 1996-04-05 | 1997-10-31 | Sony Corp | 磁気記録媒体及びその製造方法 |
JPH101327A (ja) * | 1996-06-11 | 1998-01-06 | Hoya Corp | 記録媒体用ガラス基板、該基板を用いた磁気記録媒体及びその製造方法 |
JPH1081542A (ja) * | 1996-09-04 | 1998-03-31 | Hoya Corp | 情報記録媒体用基板に用いる材料、これを用いる基板及びこの基板を用いる磁気ディスク |
JPH10198941A (ja) * | 1996-12-29 | 1998-07-31 | Hoya Corp | 磁気記録媒体及びその製造方法 |
JP2001155329A (ja) * | 1999-11-30 | 2001-06-08 | Sony Corp | 磁気記録媒体 |
JP2002025032A (ja) * | 2000-06-30 | 2002-01-25 | Sony Corp | 磁気記録媒体 |
JP2002083417A (ja) * | 2000-09-07 | 2002-03-22 | Hitachi Maxell Ltd | 磁気記録媒体及びそれを用いた磁気記録装置 |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005222675A (ja) * | 2004-01-09 | 2005-08-18 | Tohoku Univ | 垂直磁気記録媒体 |
JP4678716B2 (ja) * | 2004-01-09 | 2011-04-27 | 国立大学法人東北大学 | 垂直磁気記録媒体 |
US8323808B2 (en) | 2004-01-09 | 2012-12-04 | Fuji Electric Co., Ltd. | Perpendicular magnetic recording medium |
US8691402B2 (en) | 2004-01-09 | 2014-04-08 | Fuji Electric Co., Ltd. | Perpendicular magnetic recording medium |
Also Published As
Publication number | Publication date |
---|---|
KR20040105232A (ko) | 2004-12-14 |
JPWO2003100773A1 (ja) | 2005-09-29 |
EP1508895A1 (en) | 2005-02-23 |
US20050042481A1 (en) | 2005-02-24 |
CN1625769A (zh) | 2005-06-08 |
EP1508895A4 (en) | 2005-06-22 |
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