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    Magneto-optical media
    2.
    发明公开
    Magneto-optical media 失效
    磁力测量医学

    公开(公告)号：EP0762413A1

    公开(公告)日：1997-03-12

    申请号：EP96203114.2

    申请日：1990-03-28

    申请人： SEIKO EPSON CORPORATION

    发明人： Ootsuki, Shinya ,  Nebashi, Satoshi ,  Miyazawa, Hiromu ,  Kawase, Takeo

    IPC分类号： G11B11/10

    CPC分类号： G11B11/10586 ,  G11B11/10591 ,  G11B11/10593 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

    摘要： The present invention relates to a magneto-optical media. Especially, the present invention relates to the device for assuring a high S/N ratio by controlling optical phase difference owned by the media by optimising the film structure of a multi-layered thin film.
    The structure of the multi-layered thin film is such that at least the first protective film of the thickness between 400 Å and 700 Å, a recording film of the thickness between 150 Å and 300 Å, the second protective film of the thickness between 150 Å and 250 Å, and a reflecting film of the thickness between 400 Å and 800 Å, are successively laminated.
    The first protective layer and the second protective layer are both suitably made of AlSiN, SiN, or SiO 2 having refractivity between 1.95 and 2.05.
    It is suitable that the recording layer has the composition

            Nd x Dy y (Fe z Co) 100-x-y ,

    or

            Nd x (DyTb) y (Fe z CO 1-z ) 100-x-y ,

    where the following relation holds : 25 at % ≦ x + y ≦ 30 at %, 0 at % ≦ x ≦ 8 at %, and 0.07 ≦ z ≦ 0.43 at %.

    摘要翻译： 本发明涉及一种磁光介质。 特别地，本发明涉及通过优化多层薄膜的膜结构来控制由介质所拥有的光学相位差来确保高S / N比的装置。 多层薄膜的结构使得至少第一保护膜的厚度在400至700之间，厚度在150和300之间的记录膜，厚度在150之间的第二保护膜 ANGSTROM和250 ANGSTROM，以及400 ANGSTROM和800 ANGSTROM之间的厚度的反射膜。 第一保护层和第二保护层都适宜地由折射率在1.95和2.05之间的AlSiN，SiN或SiO 2制成。 记录层具有NdxDyy（FezCo）100-xy或Ndx（DyTb）y（FezCO1-z）100-xy的组成是合适的，其中以下关系成立：