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1. 发明专利

DE69709575D1 未知
公开(公告)号：DE69709575D1
公开(公告)日：2002-02-21
申请号：DE69709575
申请日：1997-05-16
申请人： HITACHI LTD
发明人： KANBE TETSUYA , ISHIKAWA AKIRA , TAMAI ICHIRO , YAHISA YOTSUO , HOSOE YUZURU , TANAHASHI KIWAMU , MATSUDA YOSHIBUMI , KATAOKA HIROYUKI , ONO TOSHINORI , FUKAYA SHINJI , URA KAZUHIRO , ENDO NAOTO , YAMAMOTO TOMOO
IPC分类号： G11B5/00 , G11B5/012 , G11B5/39 , G11B5/66 , G11B5/73 , G11B5/64
摘要： A magnetic recording system includes an in-plane magnetic recording medium (4) having a magnetic layer (23) fabricated on a single underlayer or on a plurality of underlayers (21 - 22) respectively fabricated on a substrate (20); a driver unit for driving the in-plane magnetic recording medium in a write direction; a magnetic head (1) having a read unit and a write unit; a unit (2) for moving the magnetic head relative to the in-plane magnetic recording medium; and a read/write signal processing unit for reading an output signal from the magnetic head and writing an input signal to the magnetic recording media, wherein the read unit of the magnetic head is a magnetoresistive head and the single underlayer or at least one (21) of the plurality of underlayers is made of Co-containing amorphous material or fine crystal material, or is made of alloy material, the alloy material having as the main components at least one element selected from a group consisting of Cr, Mo, V and Ta and containing at least one element selected from a group consisting of B, C, P and Bi. The magnetic recording system can be realized which can read and write high density information and have high reliability.

2. 发明公开

EP0809238A3 Magnetic recording media and magnetic recording system using the same 失效
标题翻译：一种磁记录介质，和所述支撑用磁记录系统
公开(公告)号：EP0809238A3
公开(公告)日：1998-07-08
申请号：EP97108035
申请日：1997-05-16
申请人： HITACHI LTD
发明人： KANBE TETSUYA , ISHIKAWA AKIRA , TAMAI ICHIRO , YAHISA YOTSUO , HOSOE YUZURU , TANAHASHI KIWAMU , MATSUDA YOSHIBUMI , KATAOKA HIROYUKI , ONO TOSHINORI , FUKAYA SHINJI , URA KAZUHIRO , ENDO NAOTO , YAMAMOTO TOMOO
IPC分类号： G11B5/00 , G11B5/012 , G11B5/39 , G11B5/66 , G11B5/73 , G11B5/64
CPC分类号： B82Y25/00 , B82Y10/00 , G11B5/00 , G11B5/012 , G11B5/66 , G11B5/7325 , G11B2005/0016 , G11B2005/3996
摘要： A magnetic recording system includes an in-plane magnetic recording medium (4) having a magnetic layer (23) fabricated on a single underlayer or on a plurality of underlayers (21 - 22) respectively fabricated on a substrate (20); a driver unit for driving the in-plane magnetic recording medium in a write direction; a magnetic head (1) having a read unit and a write unit; a unit (2) for moving the magnetic head relative to the in-plane magnetic recording medium; and a read/write signal processing unit for reading an output signal from the magnetic head and writing an input signal to the magnetic recording media, wherein the read unit of the magnetic head is a magnetoresistive head and the single underlayer or at least one (21) of the plurality of underlayers is made of Co-containing amorphous material or fine crystal material, or is made of alloy material, the alloy material having as the main components at least one element selected from a group consisting of Cr, Mo, V and Ta and containing at least one element selected from a group consisting of B, C, P and Bi. The magnetic recording system can be realized which can read and write high density information and have high reliability.
摘要翻译：一种磁性记录系统包括具有磁性层（23）上的单个底层或上的下层（21 - 22）多个制造面内磁记录介质（4）的基板（20）上分别制造; 用于驱动在写入方向的面内磁记录媒体的驱动器单元; 磁头（1），具有一个读出单元和一个写入单元; 用于相对于所述面内磁记录媒体的磁头移动的单元（2）; 和用于读取关于输出信号从磁头与输入信号的写入到磁性记录介质，worin磁头的读出单元的读/写信号处理单元是磁阻磁头和单个基底层或至少一个（21 ）理解各层的多个由含Co的无定形材料或微细的晶体材料组成，或由合金材料制成的，从一组由Cr，Mo，V和的选择的至少一个元件，其具有作为主要成分的合金材料 Ta和含有选自由B中选出的至少一种元素，所述的磁性记录系统就能实现可以读取和写入的高密度信息并且具有高可靠性C，P和Bi ..

3. 发明专利

JPH1011733A MAGNETIC RECORDING MEDIUM AND ITS PRODUCTION 失效
公开(公告)号：JPH1011733A
公开(公告)日：1998-01-16
申请号：JP16272096
申请日：1996-06-24
申请人： HITACHI LTD
发明人： SAKAMOTO KOJI , ENDO NAOTO , MATSUMOTO HIROSHI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/73 , G11B5/738 , G11B5/84
摘要： PROBLEM TO BE SOLVED: To improve reproducing output in high-density recording and to improve S/N of a magnetic recording medium having an intermediate film and an intermediate oxidized film by oxidation of the intermediate film successively formed on a substrate, by rendering the intermediate oxidized film into an amorphous state. SOLUTION: In the production processes of a magnetic recording medium 10, a reinforced glass substrate 11 is first cleaned, on which a Cr intermediate layer 12 of about 25nm thickness is formed by DC magnetron sputtering. Then the intermediate layer 12 is subjected to plasma oxidation to form an intermediate oxidized film 13 in a plasma oxidation room. It is enough to form the chromium oxide film as the oxidized film 13 to the thickness to control the growth of crystals of the base film 14 and is in about several nm range. Immediately after the oxidized film 13 is formed, the substrate is heated at about 250 deg.C in a heating room, and then a Cr-15Ti base film 14 of about 20nm thickness, Co-18Cr-SPt magnetic film 15 of about 20nm thickness and a carbon protective film 16 of about 15nm thickness are formed by DC magnetron sputtering method. Thereby, the obtd. medium has high coercive force and high coercivity squareness ratio and decreases the medium noise.

4. 发明专利

JPH09115127A MAGNETIC RECORDING MEDIUM AND ITS PRODUCTION 失效
公开(公告)号：JPH09115127A
公开(公告)日：1997-05-02
申请号：JP26968595
申请日：1995-10-18
申请人： HITACHI LTD
发明人： ENDO NAOTO , TAKAGAKI ATSUSUKE , URA KAZUHIRO , FUKAYA SHINJI , SAKAMOTO KOJI
IPC分类号： G11B5/66 , G11B5/85 , G11B5/851
摘要： PROBLEM TO BE SOLVED: To improve the controllability of the thickness of each layer and to facilitate the rewriting of pattern by making the coercive force of the upper magnetic layer of a multilayered magnetic film higher than that of the lower magnetic layer and making the metals contained in the magnetic layers different from each other. SOLUTION: A nonmagnetic lower layer 12 of Cr, a lower magnetic layer 13 of Co-Cr-Ta, a nonmagnetic middle layer 14 of Cr and an upper magnetic layer 15 of Co-Cr-Pt are successively formed on a nonmagnetic substrate 11, and a carbon protective layer 16 is formed by CVD on the upper magnetic layer 15. The thicknesses of the upper and lower magnetic layers of the resultant magnetic disk can be separately measured because the wavelength regions of X-rays of Ta and Pt do not overlap. Even when the magnetomotive force of a magnetic head is weakened in the lower magnetic layer, rewriting can easily be performed and noise can be reduced.

5. 发明专利

JPH0877540A MAGNETIC DISK 失效
公开(公告)号：JPH0877540A
公开(公告)日：1996-03-22
申请号：JP21090594
申请日：1994-09-05
申请人： HITACHI LTD
发明人： ENDO NAOTO , TAKAGAKI ATSUSUKE , MATSUDA YOSHIFUMI , AIDA TOMOYOSHI , INAGAKI YUZURU , YAKU SHINAN , SHODA MITSUHIRO
IPC分类号： G11B5/66 , G11B5/65 , G11B5/73 , G11B5/738
摘要： PURPOSE: To provide a magnetic disk medium generating slight disk noise and excellent in corrosion resistance. CONSTITUTION: A magnetic layer 3 of an alloy as a ferromagnetic substance is formed in a porous state on a porous nonmagnetic underlayer 2 and an Al or Al alloy coating layer 4a is grown on the magnetic layer 3. This coating layer 4a grows between magnetic grains and the surface is made rugged. Since the magnetic grain isolated structure is maintained and the coating layer fills the grain boundaries of the porous magnetic layer, the objective magnetic disk generating slight disk noise, excellent in corrosion resistance and having an adhesion preventing effect to a magnetic head because of the rugged surface of the coating layer is obtd.

6. 发明专利

JPH07287832A MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE 失效
公开(公告)号：JPH07287832A
公开(公告)日：1995-10-31
申请号：JP8129494
申请日：1994-04-20
申请人： HITACHI LTD
发明人： YAKU SHINAN , FUJITA SHIOJI , AIDA TOMOYOSHI , YONEKAWA TAKAO , MATSUDA YOSHIFUMI , INAGAKI YUZURU , SHODA MITSUHIRO , ENDO NAOTO , FURUSAWA KENJI , TAKAGAKI ATSUSUKE , ABE KATSUO
IPC分类号： G11B5/66 , C09D5/23 , C09D7/12 , G11B5/02 , G11B5/64 , G11B5/65 , G11B5/73 , G11B5/738
摘要： PURPOSE:To reduce noise, to increase coercive force and to attain high density recording by making the crystal grains of a recording medium small and uniform in size. CONSTITUTION:Nonmagnetic Cr underlayers 12, 12' each having 50nm thickness and {110} crystal face are formed on a tempered glass substrate 11 by DC magnetron sputtering under prescribed conditions and magnetic layers 13, 13' of Co0.78Cr0.16Ta0.06 each having 30nm thickness and {10.1} crystal face are formed on the underlayers 12, 12'. Protective coating layers 14, 14' of carbon each having 20nm thickness are formed on the magnetic layers 13, 13' by a prescribed method and lubricative layers 15, 15' of perfluoroalkyl polyether are further formed as the top layers. Noise is reduced, coercive force and squareness ratio are increased to increase output and high density recording is attained.

7. 发明专利

JPH06243454A MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE 失效
公开(公告)号：JPH06243454A
公开(公告)日：1994-09-02
申请号：JP3063293
申请日：1993-02-19
申请人： HITACHI LTD
发明人： SUZUKI HIROYUKI , KODAMA NAOKI , YONEKAWA TAKAO , TAKAGAKI ATSUSUKE , ENDO NAOTO , ABE KATSUO
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/738 , G11B5/851 , H01F10/16
摘要： PURPOSE:To decrease disk noises at a high recording density by forming Co-Cr- Ta alloy films having a crystalline structure of a hexagonal closed-packed structure as, for example, ferromagnetic layers after formation of nonmagnetic ground layers on a substrate and forming Co-Cr-Ta alloy intermediate regions which have the crystalline structure of likewise the closed-packed hexagonal structure and are mainly paramagnetic on the surfaces of these alloy films, then further forming Co-Cr-Ta magnetic layers which are ferromagnetic thereon. CONSTITUTION:The metallic ground surface layers 12, 32 consisting of thin films of a Cr system, etc., are provided on the substrate 11 consisting of tempered glass, etc., and the ferromagnetic layers 13, 33 of the Co-Cr-Ta alloy films having the closed-packed hexagonal structure are formed adjacent thereto. The intermediate regions 14, 34 of the Co-Cr-Ta alloys which have the crystalline structure of likewise the closed-packed hexagonal structure and are mainly paramagnetic are formed on the surfaces thereof. Further, the magnetic Co-Cr- Ta layers which are ferromagnetic are formed thereon, by which the disk noises at the high recording density are decreased.

8. 发明专利

JP2001160213A MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE 失效
公开(公告)号：JP2001160213A
公开(公告)日：2001-06-12
申请号：JP2000340389
申请日：2000-11-02
申请人： HITACHI LTD
发明人： KANBE TETSUYA , ISHIKAWA AKIRA , FUKAYA SHINJI , TAMAI ICHIRO , YAKU YOTSUO , HOSOE YUZURU , TANAHASHI KIWAMU , MATSUDA YOSHIFUMI , KATAOKA HIROYUKI , ONO TOSHINORI , ENDO NAOTO , URA KAZUHIRO
IPC分类号： G11B5/738 , G11B5/64
摘要： PROBLEM TO BE SOLVED: To provide a magnetic storage device capable of recording and repro ducing high density information and having high reliability. SOLUTION: The magnetic storage device having a magnetic recording medium, a driving part for driving the medium in a recording direction, a magnetic head consisting of a recording part and a reproducing part, a means for relatively moving the magnetic head to the medium and a recording and reproducing signal processing means for inputting signals to the magnetic head and reproducing the signals outputted from the magnetic head is characterized in that the reproducing part of the magnetic head is constituted of a magnetoresistance effect magnetic head and the magnetic recording medium has a structure having a magnetic layer formed on a substrate through a multi-layered based layer consisting of a plurality of laminated base layers and at least one layer of the multi-layered base layer consists of a Co containing amorphous or fine crystalline material. Thus, noise is reduced, and a high S/N and a low bit error rate are obtained and the magnetic storage device having a mean failure interval of 300 thousand hours or above at a high recording density of 1G bits per square inch is realized.

9. 发明专利

JP2000348337A MANUFACTURE OF MAGNETIC DISK, MAGNETIC DISK, MAGNETIC DISK DEVICE, MAGNETIC DISK ARRAY SYSTEM, AND CLEANING TAPE 失效
公开(公告)号：JP2000348337A
公开(公告)日：2000-12-15
申请号：JP16007099
申请日：1999-06-07
申请人： HITACHI LTD
发明人： ENDO NAOTO , FUNAMOTO SUSUMU , MATSUDA YOSHIFUMI , OZAKI MICHINORI , AIDA TOMOYOSHI , MARUYAMA FUMINOBU , NAGANO TAKANORI
IPC分类号： B24B21/00 , B24D3/00 , B24D11/00 , G11B5/64 , G11B5/82 , G11B5/84
摘要： PROBLEM TO BE SOLVED: To suppress even very small damages to become a reproducing signal error given to the surface of a magnetic disk, and simultaneously eliminate a projecting part to interfere with the floating of a magnetic head. SOLUTION: By setting the size of each of abrasive grains in the range of =0.05 μm and carrying out cleaning using a cleaning tape having the depth of a chip pocket set equal to >=500 nm, scratching by the abrasive grains is reduced, and a processing residual to become a contaminant is taken into the chip pocket and eliminated. Thus, very small damage to become a reproducing signal error given to the surface of a magnetic disk is reduced.

10. 发明专利

JPH08227515A MAGNETIC RECORDING MEDIUM FOR IN-PLANE RECORDING AND PRODUCTION THEREOF 失效
公开(公告)号：JPH08227515A
公开(公告)日：1996-09-03
申请号：JP3198795
申请日：1995-02-21
申请人： HITACHI LTD
发明人： AIDA TOMOYOSHI , FUKAYA SHINJI , ENDO NAOTO
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/73 , G11B5/738 , G11B5/85
摘要： PURPOSE: To attain high density recording and reduced noise for a magnetic recording medium for in-plane recording using a nonmagnetic substrate of ceramics, etc. CONSTITUTION: A magnetic recording film 13 contg. Co as an essential constituent element is formed on a nonmagnetic glass substrate 11 through a nonmagnetic underlying film 12 of Cr, etc., and a nonmagnetic coating film 14 is further formed to obtain the objective magnetic recording medium. The diffraction intensity of the (0002) face of the Co among its crystal orientation faces measured by the X-ray diffraction of the magnetic recording film is 1.5-8 times the total diffraction intensity of the other faces.

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