发明授权
US5723198A Multi-layered magnetic recording medium and magnetic recording system
employing the same
失效
多层磁记录介质和采用该磁记录介质的磁记录系统
- 专利标题: Multi-layered magnetic recording medium and magnetic recording system employing the same
- 专利标题(中): 多层磁记录介质和采用该磁记录介质的磁记录系统
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申请号: US258923申请日: 1994-06-13
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公开(公告)号: US5723198A公开(公告)日: 1998-03-03
- 发明人: Yuzuru Hosoe , Yoshihiro Shiroishi , Akira Ishikawa , Futoshi Tomiyama , Kazuetsu Yoshida , Tomoo Yamamoto , Yotsuo Yahisa , Akira Osaki , Katsuo Abe , Shinji Narishige , Naoki Kodama , Kiwamu Tanahashi , Emi Mangyo
- 申请人: Yuzuru Hosoe , Yoshihiro Shiroishi , Akira Ishikawa , Futoshi Tomiyama , Kazuetsu Yoshida , Tomoo Yamamoto , Yotsuo Yahisa , Akira Osaki , Katsuo Abe , Shinji Narishige , Naoki Kodama , Kiwamu Tanahashi , Emi Mangyo
- 申请人地址: JPX Tokyo
- 专利权人: Hitachi, Ltd.
- 当前专利权人: Hitachi, Ltd.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX5-140351 19930611; JPX5-225439 19930910
- 主分类号: G11B5/66
- IPC分类号: G11B5/66
摘要:
In a magnetic recording system including magnetic recording media, a rotation driving unit for driving these magnetic recording media, read/write magnetic heads, driving apparatus for driving these read/write magnetic heads, and a read/write signal processing apparatus, a reading portion of the respective magnetic heads is arranged by a magnetoresistive head. The magnetic recording media are constructed of multi-layered magnetic media having a plurality of magnetic layers fabricated directly, or via underlayers on a non-magnetic disk substrate, and of non-magnetic intermediate layers arranged among these non-magnetic layers. Furthermore, one coercivity which is measured by applying a magnetic field along a circumferential direction of the magnetic recording media, is selected to be larger than the other coercivity which is measured by applying a magnetic field along a radial direction of the magnetic recording media, so that a higher signal-to-noise ratio is achieved, as compared with that of the conventional magnetic recording system. Since the thickness of the non-magnetic intermediate layers is smaller than or equal to 5 nm, and also the total layer is smaller than or equal to 5 nm, and also the total layer number of the plural magnetic layers is selected to be odd, better characteristics can be achieved. Accordingly, since the MTBF (Mean Time Before Failure) is longer than or equal to 0.15 million hours with high recording density, and the disk substrate and the magnetic head sliders can be mounted at high packaging density, a compact and high-capacity magnetic recording system can be obtained.
公开/授权文献
- US4952070A Digital data coding technique 公开/授权日:1990-08-28
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