发明授权
US5014252A Over write capable magnetooptical recording method using two beams, and magnetooptical recording apparatus therefor 失效
使用两个光束的写可写磁光记录方法及其光磁记录装置

  • 专利标题: Over write capable magnetooptical recording method using two beams, and magnetooptical recording apparatus therefor
  • 专利标题(中): 使用两个光束的写可写磁光记录方法及其光磁记录装置
  • 申请号: US570978
    申请日: 1990-08-22
  • 公开(公告)号: US5014252A
    公开(公告)日: 1991-05-07
  • 发明人: Hideki AkasakaMasatoshi Sato
  • 申请人: Hideki AkasakaMasatoshi Sato
  • 申请人地址: JPX Tokyo
  • 专利权人: Nikon Corporation
  • 当前专利权人: Nikon Corporation
  • 当前专利权人地址: JPX Tokyo
  • 优先权: JPX61-239852 19861008
  • 主分类号: G11B11/105
  • IPC分类号: G11B11/105
Over write capable magnetooptical recording method using two beams, and
magnetooptical recording apparatus therefor
摘要:
A magnetooptical recording method for recording data using a bit having upward-magnetization and a bit having downward-magnetization on a recording layer of a magnetooptical-recording medium comprises the steps of using, as the medium, a multilayered magnetic recording medium consisting of a first layer having a perpendicular magnetic anisotropy acting as a recording layer, and a second layer having a perpendicular magnetic anisotropy acting as a reference layer; moving the medium; applying an initial field so that, before recording, the direction of magnetization of the recording layer is left unchanged and that of the reference layer is aligned either upward or downward; radiating two adjacent laser beams, i.e., a leading beam and a trailing beam onto the medium; the leading beam being an erasing beam of low level which is not modulated in principle; the trailing beam is a writing beam which is pulse modulated between high level and basis level in accordance with binary data to be recorded; and the basis level being able to have an intensity equal to or lower than the low level and to be zero level; when the trailing laser beam is radiated, applying a bias field to the irradiated portion; and when the intensity of the pulse-modulated laser beam is at high level, forming one of the bit having upward-magnetization, and when the leading low-level laser beam is radiated, forming the other bit.
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