发明授权
US5604046A Magneto-optical recording medium and a method using the same 失效
磁光记录介质及其使用方法

  • 专利标题: Magneto-optical recording medium and a method using the same
  • 专利标题(中): 磁光记录介质及其使用方法
  • 申请号: US195061
    申请日: 1994-02-14
  • 公开(公告)号: US5604046A
    公开(公告)日: 1997-02-18
  • 发明人: Yoichi Osato
  • 申请人: Yoichi Osato
  • 申请人地址: JPX Tokyo
  • 专利权人: Canon Kabushiki Kaisha
  • 当前专利权人: Canon Kabushiki Kaisha
  • 当前专利权人地址: JPX Tokyo
  • 优先权: JPX2-41323 19900223; JPX2-59901 19900313
  • 主分类号: G11B11/105
  • IPC分类号: G11B11/105 G11B5/66
Magneto-optical recording medium and a method using the same
摘要:
This specification discloses a magneto-optical recording medium in which on the opposite side of a second magnetic layer having a relatively low curie temperature and a relatively great coercive force, there are laminated a first magnetic layer and a third magnetic layer each having a relatively high curie temperature and a relatively small coercive force as compared with the second magnetic layer, the second magnetic layer has its curie temperature varying in the direction of film thickness thereof and has a curie temperature T.sub.L1 near the interface thereof with the first magnetic layer and has a curie temperature T.sub.L3 near the interface thereof with the third magnetic layer, and T.sub.L1 .noteq.T.sub.L3, and the first magnetic layer, the second magnetic layer and the third magnetic layer are coupled together at room temperature by the exchange interaction therebetween and a state in which the direction of magnetization of the first magnetic layer and the direction of magnetization of the third magnetic layer are anti-parallel to each other is a stable state. The specification also discloses a magneto-optical recording method using such magneto-optical recording medium.
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