发明授权
- 专利标题： Garnet polycrystalline film for magneto-optical recording medium
- 专利标题（中）： 用于磁光记录介质的石榴石多晶膜
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申请号： US791653申请日： 1991-11-13
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公开(公告)号： US5501913A公开(公告)日： 1996-03-26
- 发明人: Kenji Shimokawa , Norikazu Kawamura
- 申请人： Kenji Shimokawa , Norikazu Kawamura
- 申请人地址： JPX both of JPX both of
- 专利权人： Nippon Steel Corporation,Nippon Hoso Kyokai
- 当前专利权人： Nippon Steel Corporation,Nippon Hoso Kyokai
- 当前专利权人地址： JPX both of JPX both of
- 主分类号： G11B11/105
- IPC分类号： G11B11/105 ; H01F10/32 ; G11B5/66 ; C04B35/00
摘要：
A garnet polycrystalline film for a magneto-optical recording medium including at least two layers of polycrystalline garnet represented by Bi.sub.x R.sub.3-x M.sub.Y Fe.sub.5-Y O.sub.12, where 0.ltoreq.X.ltoreq.3, 0 Y.ltoreq.5, R represents one or more rare earth elements containing yttrium, and M represents Ga, Al or In, wherein crystal lattice constants of these adjacent two layers are different from each other by .+-.0.3% or more, and an average crystal grain diameter of one of the layers is smaller than that of the other layer and 1 .mu.m or less, and a magneto-optical recording disk using this garnet polycrystalline film.
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