发明公开
- 专利标题： Magnetooptical recording medium allowing overwriting with two or more magnetic layers and recording method utilizing the same
- 专利标题（中）： 允许用两个或更多磁性层重写的磁光记录介质和利用其的记录方法
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申请号： EP98200006.9申请日： 1987-07-08
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公开(公告)号： EP0838814A3公开(公告)日： 1998-06-17
- 发明人: Osato, Yoichi , Kawade, Hisaaki , Fujii, Eiichi , Kasama, Nobuhiro , Kobayashi, Tadashi
- 申请人： CANON KABUSHIKI KAISHA
- 申请人地址： 30-2, 3-chome, Shimomaruko, Ohta-ku Tokyo JP
- 专利权人： CANON KABUSHIKI KAISHA
- 当前专利权人： CANON KABUSHIKI KAISHA
- 当前专利权人地址： 30-2, 3-chome, Shimomaruko, Ohta-ku Tokyo JP
- 代理机构： Beresford, Keith Denis Lewis
- 优先权： JP158787/86 19860708; JP191202/86 19860816; JP262034/86 19861105; JP278566/86 19861125; JP278567/86 19861125; JP20384/87 19870202; JP21675/87 19870203; JP23993/87 19870204; JP24706/87 19870206; JP24707/87 19870206; JP27082/87 19870210; JP27083/87 19870210; JP37736/87 19870223; JP52897/87 19870310; JP72559/87 19870326; JP70273/87 19870326; JP70274/87 19870326; JP70278/87 19870326; JP70279/87 19870326; JP153108/87 19870618
- 主分类号： G11B11/10
- IPC分类号： G11B11/10
摘要：
This apparatus and system comprise a medium (11) provided with a first magnetic layer (2) and at least a second magnetic layer (3) having a higher Curie point temperature (Tc) and a lower coercive force (H L ) than those of said first magnetic layer and being exchange coupled with said first magnetic layer satisfying a relation: H H > H L > σ w 2M s h wherein H H is the coercive force of the first magnetic layer; H L is the coercive force of the second magnetic layer; M s is the saturation magnetization of the second magnetic layer; h is the thickness thereof; and σ w is the magnetic wall energy between the first and second magnetic layers, means (6,14,22) for irradiating the medium (11) with a modulated light beam and means (24) for applying magnetic fields to the medium.
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