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公开(公告)号：EP0099564B1
公开(公告)日：1988-08-24
申请号：EP83107031.3
申请日：1983-07-18
申请人： HITACHI, LTD. , Hitachi Maxell Ltd.
IPC分类号： G11B5/66
CPC分类号： G11B5/66 , G11B2005/0029 , Y10S428/928 , Y10T428/12438 , Y10T428/12465 , Y10T428/12535 , Y10T428/12931 , Y10T428/12937 , Y10T428/12944 , Y10T428/12951
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公开(公告)号：EP0158338A3
公开(公告)日：1987-01-14
申请号：EP85104338
申请日：1985-04-10
申请人： HITACHI, LTD. , Hitachi Maxell Ltd.
CPC分类号： G11B5/667 , G11B5/66 , G11B5/7325 , Y10S428/90 , Y10T428/12465 , Y10T428/12674
摘要： Disclosed is a perpendicular magnetic recording medium wherein an under layer (2) made of a material containing Si and/or Ge as its principal ingredient is deposited on a substrate (1), and a perpendicular magnetic film (3) made of a Co-based alloy is deposited on the under layer. With the perpendicular magnetic recording medium, the perpendicular magnetic film has an enhanced degree of C-axis orientation, and the bond strength between the perpendicular magnetic film and the substrate is also enhanced when the substrate is non-metallic.
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公开(公告)号：EP0158338A2
公开(公告)日：1985-10-16
申请号：EP85104338.0
申请日：1985-04-10
申请人： HITACHI, LTD. , Hitachi Maxell Ltd.
CPC分类号： G11B5/667 , G11B5/66 , G11B5/7325 , Y10S428/90 , Y10T428/12465 , Y10T428/12674
摘要： Disclosed is a perpendicular magnetic recording medium wherein an under layer (2) made of a material containing Si and/or Ge as its principal ingredient is deposited on a substrate (1), and a perpendicular magnetic film (3) made of a Co-based alloy is deposited on the under layer. With the perpendicular magnetic recording medium, the perpendicular magnetic film has an enhanced degree of C-axis orientation, and the bond strength between the perpendicular magnetic film and the substrate is also enhanced when the substrate is non-metallic.
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4.发明公开
公开(公告)号：EP0099564A2
公开(公告)日：1984-02-01
申请号：EP83107031.3
申请日：1983-07-18
申请人： HITACHI, LTD. , Hitachi Maxell Ltd.
IPC分类号： G11B5/66
CPC分类号： G11B5/66 , G11B2005/0029 , Y10S428/928 , Y10T428/12438 , Y10T428/12465 , Y10T428/12535 , Y10T428/12931 , Y10T428/12937 , Y10T428/12944 , Y10T428/12951
摘要： A perpendicular magnetic recording medium free from spike noise having a high permeability magnetic material film (2), an antiferromagnetic material film (6) and a perpendicularly oriented magnetic material film (3) formed on a substrate (1) in this order. Another high permeability magnetic material film (9) may be formed between the antiferromagnetic material film and the perpendicularly oriented magnetic material film. During the formation of the antiferromagnetic material film (6), a magnetic field is applied in a direction of a track width.
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公开(公告)号：EP0099124A2
公开(公告)日：1984-01-25
申请号：EP83106883.8
申请日：1983-07-13
申请人： HITACHI, LTD.
发明人： Shiiki, Kazuo , Shiroishi, Yoshihiro , Yuito, Isamu , Shinagawa, Kiminari , Uesaka, Yasutaro , Fujiwara, Hideo , Nakamura, Hitoshi
CPC分类号： G11B5/1278 , G11B5/00 , G11B5/127 , G11B5/62
摘要： A magnetic recording and reproducing system comprising i) a magnetic head (3) including a first magnetic pole (35) whose saturation flux density (Bs 1 ) is at least 7 kG and whose edge face (Tp,) is 0.15 - 0.5 µm thick, and a second magnetic pole (32) which lies on the same side as the first magnetic pole (35) with respect to a recording medium (4) and whose edge face (Tp 2 ) is at least 10 times thicker than that of the first magnetic pole (35), and ii) the perpendicular magnetic recording medium (4) including a perpendicular magnetization layer (43) which has a coercive force (Hc 1 ) of 250 - 60 0 Oe. in a direction perpendicular to a plane thereof and which is 0.1 - 0.5 µm thick.
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公开(公告)号：EP0386762B1
公开(公告)日：1995-01-04
申请号：EP90104451.1
申请日：1990-03-08
申请人： HITACHI, LTD.
发明人： Chiba, Katsuyoshi , Katsumoto, Masayuki , Uesaka, Yasutaro , Fukke, Hajime , Ishihara, Heigo , Matsuyama, Iwao , Kodama, Naoki , Inoue, Hitoshi, Hitachi Daini Kyoshinryo , Terada, Yoshiharu, Hitachi Daiyon Kyoshinryo
CPC分类号： G11B5/845
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公开(公告)号：EP0386762A3
公开(公告)日：1991-05-29
申请号：EP90104451.1
申请日：1990-03-08
申请人： HITACHI, LTD.
发明人： Chiba, Katsuyoshi , Katsumoto, Masayuki , Uesaka, Yasutaro , Fukke, Hajime , Ishihara, Heigo , Matsuyama, Iwao , Kodama, Naoki , Inoue, Hitoshi, Hitachi Daini Kyoshinryo , Terada, Yoshiharu, Hitachi Daiyon Kyoshinryo
CPC分类号： G11B5/845
摘要： A coating type, magnetic disk is produced by applying a magnetic paint containing magnetic powders in a dispersed state to a non-magnetic substrate (3), thereby forming a magnetic recording film (100, 100′) thereon, and applying surface waves (vibrator 4) to the magnetic recording film (100, 100′) in an undried state. By applying the surface waves to the magnetic recording film (100, 100′), dispersibility and orientation of the magnetic powders are improved and a longitudinally oriented, coating type magnetic disk with distinguished electromagnetic properties, such as a high S/N ratio, etc. can be obtained.
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公开(公告)号：EP0158338B1
公开(公告)日：1988-12-14
申请号：EP85104338.0
申请日：1985-04-10
申请人： HITACHI, LTD. , Hitachi Maxell Ltd.
CPC分类号： G11B5/667 , G11B5/66 , G11B5/7325 , Y10S428/90 , Y10T428/12465 , Y10T428/12674
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公开(公告)号：EP0099564A3
公开(公告)日：1986-01-15
申请号：EP83107031
申请日：1983-07-18
申请人： HITACHI, LTD. , Hitachi Maxell Ltd.
IPC分类号： G11B05/66
CPC分类号： G11B5/66 , G11B2005/0029 , Y10S428/928 , Y10T428/12438 , Y10T428/12465 , Y10T428/12535 , Y10T428/12931 , Y10T428/12937 , Y10T428/12944 , Y10T428/12951
摘要： A perpendicular magnetic recording medium free from spike noise having a high permeability magnetic material film (2), an antiferromagnetic material film (6) and a perpendicularly oriented magnetic material film (3) formed on a substrate (1) in this order. Another high permeability magnetic material film (9) may be formed between the antiferromagnetic material film and the perpendicularly oriented magnetic material film. During the formation of the antiferromagnetic material film (6), a magnetic field is applied in a direction of a track width.
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10.发明授权Method for magnetic orientation of magnetic recording medium and system therefor and longitudinally oriented magnetic recording medium 失效方法和装置用于磁性记录介质的磁性取向和纵向取向的磁性记录介质。
公开(公告)号：EP0367291B1
公开(公告)日：1995-10-04
申请号：EP89120406.7
申请日：1989-11-03
申请人： HITACHI, LTD.
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