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1. 发明专利

JP2002092838A MAGNETIC RECORDING MEDIUM 审中-公开
公开(公告)号：JP2002092838A
公开(公告)日：2002-03-29
申请号：JP2001242295
申请日：2001-08-09
申请人： HITACHI LTD
发明人： YOSHIDA KAZUYOSHI , SHIROISHI YOSHIHIRO , SAITO MAKOTO , TSUMITA NORIKAZU , YAMASHITA TAKEO , SUZUKI HIROYUKI , KITAZAKI YASUSHI , OURA MASAKI
IPC分类号： G11B5/64
摘要： PROBLEM TO BE SOLVED: To clearly state magnetic characteristics to be provided with by a magnetic thin film in order to lower noise of a magnetic recording medium of ferromagnetic thin film type and to provide the magnetic recording medium having high S/N characteristic. SOLUTION: In the magnetic recording medium of the ferro-magnetic thin film type in which the magnetic thin film made of a metal or an alloy of ferromagnetism is formed on a substrate as a magnetic recording layer by a sputtering method, the magnetic thin film has a magnetization inversion mechanism being akin to a simultaneous rotation model and noise of the magnetic recording medium is lowered. Further the magnetic thin film is used as the magnetic recording medium having the magnetic recording layer which is made of a single metal selected from among Co, Ni and Fe or an alloy consisting essentially of at least one kind of element selected from among Co, Ni and Fe and further contains at least one kind of element selected from among Cu, V, Zr and Ru by 0.1 to 15% expressed by atm %.

2. 发明专利

JPH11191216A MAGNETIC DISK AND SUBSTRATE THEREFOR 失效
公开(公告)号：JPH11191216A
公开(公告)日：1999-07-13
申请号：JP29640598
申请日：1998-10-19
申请人： HITACHI LTD
发明人： TANAKA HIDEAKI , GOMI KENICHI , SAWAHATA SHOICHI , KONDOU MAKI , OURA MASAKI , MIYAKE YOSHIHIKO , KATO YOSHIKI , OKUWAKI TOYOJI , OKAMOTO NORIAKI , NAKAGAWA YOSHIO
IPC分类号： G11B5/72 , G11B5/73 , G11B5/82
摘要： PROBLEM TO BE SOLVED: To maintain floating stability of a magnetic head over a long period by arranging a lot of projecting parts having about a constant height on a disk surface to be helical centering the center of the disk, and making the deviated amount in the radial direction between those projecting parts, which are helically arranged and successively adjacent to each other, to the radial width of the projecting part or less. SOLUTION: Linear or pit-formed projecting parts 7, consisting of parts of circular arcs of concentric circles or helical circles centering the center of rotation of a magnetic disk 14, are arranged regularly. A part of non- projected part is arranged so as to be smoothly successive from the internal circumference to the external circumference of the magnetic disk 14 within a moving area of a magnetic head. Thus, when the magnetic disk 14 is rotated by putting a slider on the magnetic disk 14, the projecting parts 7 are faced to the whole surface of the slider while they are successively slipping off to the side of the external circumference, so dusts adhered to the slider can be removed therefrom and can further be removed off the side of the external circumference through the non-projecting parts 7 by a centrifugal force.

3. 发明专利

JPH11154321A INTRA-SURFACE MAGNETIC RECORDING MEDIUM AND ITS PRODUCTION AND MAGNETIC STORAGE DEVICE 失效
公开(公告)号：JPH11154321A
公开(公告)日：1999-06-08
申请号：JP26268398
申请日：1998-09-17
申请人： HITACHI LTD
发明人： SUZUKI HIROYUKI , SHIROISHI YOSHIHIRO , HISHIYAMA SADAO , OONO TSUGUYUKI , YAKU SHINAN , MATSUDA YOSHIFUMI , TSUMITA NORIKAZU , OURA MASAKI , SHIROKURA TAKAAKI , SHIGE NORIYUKI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/73 , G11B5/738 , G11B5/85 , G11B5/851
摘要： PROBLEM TO BE SOLVED: To provide an intra-surface magnetic recording medium of at least 1200 Oe in intra-surface coercive force Hc and

4. 发明专利

JPH0991652A MAGNETIC STORAGE MEDIUM AND MAGNETIC STORAGE DEVICE 失效
公开(公告)号：JPH0991652A
公开(公告)日：1997-04-04
申请号：JP24130895
申请日：1995-09-20
申请人： HITACHI LTD
发明人： TAKEO NORIYUKI , WATANABE MASAHIRO , TANAKA HIDEO , OURA MASAKI
IPC分类号： G11B5/66 , G11B5/72 , G11B5/73
摘要： PROBLEM TO BE SOLVED: To improve reliability in a severe environment at high temp. and humidity by laminating a magnetic film and a protective film on a substrate having a prescribed surface roughness and forming a lubricative film whose thickness is less than half the surface roughness of the protective film. SOLUTION: An underlying film 2 of Ni-P plating, an underlying film 3, a magnetic film 4, a protective film 5 and a lubricative film 6 are laminated on an Al substrate 1 supporting a magnetic medium to obtain a magnetic disk. In a magnetic disk device, the magnetic disk is fixed in a rotatable state and combined with a magnetic head slider 7 and a signal is recorded, read and written. Glass 8 or ceramic may be used as the material of the substrate 1. In order to attain high density and high capacity, the spacing between the magnetic disk and a magnetic head in the magnetic disk device is reduced, that is, the height of levitation of the head is reduced. It is therefore necessary to adopt a magnetic disk having such high flatness that the head is not crashed by contact with the disk and the average surface roughness Ra of the disk is regulated to

5. 发明专利

JPH06103525A MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH06103525A
公开(公告)日：1994-04-15
申请号：JP16064792
申请日：1992-06-19
申请人： HITACHI LTD
发明人： OURA MASAKI , SAITO MAKOTO
IPC分类号： G11B5/31
摘要： PURPOSE:To provide the magnetic recorder having excellent writing characteristic and reproducing characteristic. CONSTITUTION:A first magnetic layer 11 is formed by sputtering at 1.5mum thickness on a sapphire single crystal substrate 10 having extremely high wear resistance and is patterned to a prescribed shape. Further, an alumina film 12 constituting a magnetic gap length is formed at 0.5mum and a conductor coil 13 of a plane spiral type is deposited by evaporation and is patterned. A suitable insulator 14 is formed on the conductor coil 13 so as to cover the ruggedness of the conductor coil and a second magnetic layer 15 is formed by sputtering at 2mum thickness to cover the conductor coil and the insulator and is patterned to a prescribed shape. The thin-film magnetic head obtd. in such a manner and the magnetic recording medium are combined, thereby, the magnetic recorder is constituted. As a result, the magnetic recorder having the excellent writing characteristics and reproducing characteristics is obtd.

6. 发明专利

JPH0644548A MAGNETIC RECORDING MEDIUM AND MAGNETIC MEMORY DEVICE 失效
公开(公告)号：JPH0644548A
公开(公告)日：1994-02-18
申请号：JP2110892
申请日：1992-02-06
申请人： HITACHI LTD
发明人： YAMAMOTO TOMOO , SHIROISHI YOSHIHIRO , ISHIKAWA AKIRA , KAMISAKA YASUTARO , HISHIYAMA SADAO , OONO TSUGUYUKI , YAKU SHINAN , OURA MASAKI
IPC分类号： G11B5/127 , G11B5/39 , G11B5/64 , G11B5/65 , G11B5/66 , G11B5/73
摘要： PURPOSE:To decrease medium noises and to improve S/N as the device by forming plural layers which vary respectively in film thicknesses and equaling the products of the respective residual magnetizations and film thicknesses. CONSTITUTION:Nonmagnetic substrates 12, 12' consisting of Cr, Mo, W or the alloys thereof are formed on a nonmagnetic substrate 11 formed with Ni-P plating at 10mum thickness on tempered glass, etc., and magnetic layers 13, 13' consisting of a magnetic alloy, such as CoCrPt, are formed thereon. Further, nonmagnetic intermediate layers 14, 14' consisting of the Cr, Mo, W or the alloys thereof are formed thereon. Magnetic layers 15, 15' consisting of a magnetic alloy, such as CoCrPt or CoCrTa, and protective layers 16, 16' consisting of C, WC, etc., are formed thereon and lubricating layers 17, 17' consisting of perfluoroalkyl polyether, etc., are formed thereon. The magnetic layers are formed at such film thicknesses delta which the product of the residual magnetization films thickness (Br.delta) of the magnetic layer 13, 13' and the product (Br.delta) of the residual magnetization films thickness of the magnetic layers 15, 15' are nearly equaled to each other. The crystal growth of the magnetic layers is thereby suppressed and the medium noises are decreased. The S/N as the device is improved.

7. 发明专利

JPH04123314A DISK TYPE RECORDING MEDIUM AND MEMORY DEVICE 失效
公开(公告)号：JPH04123314A
公开(公告)日：1992-04-23
申请号：JP24418090
申请日：1990-09-14
申请人： HITACHI LTD
发明人： KOJIMA SHUICHI , SUZUKI HIROYUKI , KATO AKIRA , IECHIKA KEIGO , TAKADA MIKIO , OURA MASAKI
IPC分类号： G11B5/64 , G11B5/73 , G11B5/82 , G11B17/038 , G11B19/20 , G11B23/00 , G11B23/03 , G11B25/04
摘要： PURPOSE:To enhance mechanical reliability and to reduce the thickness of substrates by averting the formation of through-holes in the disk type recording medium. CONSTITUTION:The magnetic disk 10 is constituted by forming underlying layers 12, magnetic layers 13, and protective layers 14 on both surfaces of a flat nonmagnetic substrate 11 consisting of chemically reinforced glass. The through-holes for fixing to the magnetic memory device are not provided in this magnetic disk 10. Cr is used for the underlying layers 12, Co-Ni-Cr for the magnetic layers 13 and a C material for the protective layers 14. The cracking of the recording medium during high-speed rotation is substantially prevented and the mechanical reliability is improved. The thickness of the substrates themselves is easily reduced.

8. 发明专利

JPH0485725A MAGNETIC DISK DEVICE AND MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH0485725A
公开(公告)日：1992-03-18
申请号：JP19795290
申请日：1990-07-27
申请人： HITACHI LTD
发明人： GOMI KENICHI , TANAKA HIDEAKI , SUGIMOTO HIROYUKI , SAWAHATA SHOICHI , OURA MASAKI , MIYAKE YOSHIHIKO , KATO YOSHIKI
IPC分类号： G11B5/82 , G11B5/64 , G11B5/73 , G11B5/738
摘要： PURPOSE:To prevent the modulation of an electrical output and to stably maintain floating even if the floating quantity of a magnetic head is decreased by orienting a magnetic layer in a circumferential direction. CONSTITUTION:Only the hill part directly faces the head and the area ratio of the magnetic recording medium in contact with a head can be decreased and, therefore, the friction force and attraction force to the head are lowered. In addition, the fluctuation in the floating quantity of the head is decreased if the formed hills are regularly disposed. The stability of the floating of the head is assured over the entire surface of the magnetic recording medium and the fluctuation in the output by the fluctuation in the floating quantity is prevented. Further, the microgrooves formed along the circumferential direction in the hill and groove parts contribute to the shape magnetic anisotropy of the magnetic layer. The coercive force in the circumferential direction with respect to a radial direction and the squareness ratio are large and the fluctuation in the output by the modulation is lessened.

9. 发明专利

JPH03108121A MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDOR 失效
公开(公告)号：JPH03108121A
公开(公告)日：1991-05-08
申请号：JP24509589
申请日：1989-09-22
申请人： HITACHI LTD
发明人： YAHISA SHINAN , SHIROISHI YOSHIHIRO , HISHIYAMA SADAO , OONO TOMOYUKI , SUZUKI HIROYUKI , MATSUDA YOSHIFUMI , TSUMITA NORIKAZU , OURA MASAKI , SHIGE NORIYUKI , YAMAMOTO TOMOO
IPC分类号： G11B5/72 , G11B5/64 , G11B5/66 , G11B5/725 , G11B5/73 , G11B5/738
摘要： PURPOSE:To improve sliding resistance, corrosion resistance and reliability and to realize high-density recording by forming a protective cover layer comprising at least three kinds of specified elements. CONSTITUTION:The protective cover layer on the magnetic layer consists of at least three elements: at least one element selected from a first group of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, and W, at least one element selected from a second group of Y, Mg, Ca, Sc, Fe, Co, Ni, Al, Si, Ru, Rh, Pd, Os, Ir, Pt, Mn, Cu, and Ag, and at least one element selected from a third group of C, N, O, and B. By providing a lubricating layer having at least one adsorptive end group on the protective cover layer, sliding resistance and corrosion resistance of the medium can be improved. The total amt. of elements of the third group is 1 - 99atm.%, and more preferably 20 - 90atm.% of the total amt. of elements of the first group. The total amt. of elements of the second group is 0.1 - 20wt.%, more preferably 0.2 - 10wt.% of the total amt. of other elements.

10. 发明专利

JPS63160011A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS63160011A
公开(公告)日：1988-07-02
申请号：JP30641986
申请日：1986-12-24
申请人： HITACHI LTD
发明人： SHIROISHI YOSHIHIRO , HISHIYAMA SADAO , SUZUKI HIROYUKI , OONO TADAYUKI , MATSUDA YOSHIFUMI , TAKAGI KAZUMASA , TSUMITA NORIKAZU , KITAZAKI YOUJI , OURA MASAKI , NAGAIKE SADAKUNI
IPC分类号： G11B5/66 , G11B5/62 , G11B5/64 , G11B5/706 , G11B5/72 , G11B5/73 , G11B5/738
摘要： PURPOSE:To provide excellent impact resistance, oscillation resistance, corrosion resistance, etc., to a titled medium by providing a nonmagnetic intermediate layer consisting of 1 kind of element selected from a group consisting of Zr, Hf, Ta, Ti, and Nb or alloy contg. said element as an essential component between a nonmagnetic layer and magnetic layer. CONSTITUTION:At least one nonmagnetic intermediate layer consisting of at least one kind of the element selected from the group consisting of Zr, Hf, Ta, Ti, and Nb and the alloy contg. said element as the essential element is provided between the magnetic layer and nonmagnetic layer of the magnetic recording disk having the nonmagnetic coating layer. The impact resistance and oscillation resistance are thereby improve. The corrosion resistance is enhanced in the case of a thin magnetic metallic film medium. Reliability to sliding is enhanced in the case of a thin metal oxide or nitride film medium.

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