发明授权
US06346322B1 Magneto-optical recording medium and reproducing device 失效
磁光记录介质和再现装置

  • 专利标题: Magneto-optical recording medium and reproducing device
  • 专利标题(中): 磁光记录介质和再现装置
  • 申请号: US09455635
    申请日: 1999-12-07
  • 公开(公告)号: US06346322B1
    公开(公告)日: 2002-02-12
  • 发明人: Noboru IwataJunji Hirokane
  • 申请人: Noboru IwataJunji Hirokane
  • 优先权: JP10-348103 19981208
  • 主分类号: G11B566
  • IPC分类号: G11B566
Magneto-optical recording medium and reproducing device
摘要:
A magneto-optical recording medium includes at least a first magnetic layer, a second magnetic layer, a third magnetic layer, a non-magnetic intermediate layer and a fourth magnetic layer which are layered in this order, the first magnetic layer being formed of a perpendicularly magnetized film having a relatively small wall coercivity and a relatively large wall mobility compared with the third magnetic layer in the vicinity of a predetermined temperature, the second magnetic layer being formed of a magnetic film whose Curie temperature is lower than the Curie temperatures of the first magnetic layer and third magnetic layer, the fourth magnetic layer being a perpendicularly magnetized film with a uniform magnetization direction and forming a region having a uniform magnetization direction in the first magnetic layer by magnetostatic coupling with the first magnetic layer when the second magnetic layer is heated to a predetermined temperature or a higher temperature.
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