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    Perpendicular-magnetic recording media and magnetic recording apparatus
    22.
    发明授权
    Perpendicular-magnetic recording media and magnetic recording apparatus 有权

    公开(公告)号：US06641901B2

    公开(公告)日：2003-11-04

    申请号：US10340597

    申请日：2003-01-13

    申请人： Kazuetsu Yoshida ,  Masaaki Futamoto ,  Yoshiyuki Hirayama

    发明人： Kazuetsu Yoshida ,  Masaaki Futamoto ,  Yoshiyuki Hirayama

    IPC分类号： H01F1000

    CPC分类号： G11B5/66 ,  Y10T428/12861 ,  Y10T428/24942 ,  Y10T428/31678

    摘要： The present invention relates to perpendicular magnetic recording media using a ferromagnetic film provided with perpendicular magnetic anisotropy for a recording layer and a magnetic recording apparatus using the media, and the object is to provide the perpendicular magnetic recording media which are excellent in signal to noise ratio (S/N) in a large recording density region, which are stable against thermal fluctuation and which can be easily manufactured, and the magnetic recording apparatus using the media. The representative perpendicular magnetic recording media according to the invention include a glass substrate, a first recording layer which is provided on the substrate via an underlayer, which has perpendicular magnetic anisotropy and the magnitude of magnetic exchange interaction between grains of which is substantially zero and a second recording layer which is laminated on the first recording layer, which is provided with perpendicular magnetic anisotropy and the magnetic exchange interaction between grains of which is larger than that of the first recording layer.

    Manganese-aluminum and manganese-silicon magnetic films, and magnetic recording medium
    25.
    发明授权
    Manganese-aluminum and manganese-silicon magnetic films, and magnetic recording medium 失效
    锰 - 铝和锰 - 硅磁性膜和磁记录介质

    公开(公告)号：US5231294A

    公开(公告)日：1993-07-27

    申请号：US679991

    申请日：1991-03-29

    申请人： Teruaki Takeuchi ,  Masaaki Futamoto ,  Yukio Honda ,  Kazumasa Takagi ,  Yoshiyuki Hirayama

    发明人： Teruaki Takeuchi ,  Masaaki Futamoto ,  Yukio Honda ,  Kazumasa Takagi ,  Yoshiyuki Hirayama

    IPC分类号： G11B5/66 ,  H01F10/28 ,  H01F10/32

    CPC分类号： B82Y25/00 ,  G11B5/66 ,  H01F10/28 ,  H01F10/324 ,  Y10T428/12465

    摘要： A ferromagnetic thin film of manganese and aluminum having varied atomic concentrations of manganese and aluminum in the direction perpendicular to the film plane, preferably the Mn atomic concentration being preferably in a range of 45 to 65% by atom, has a spontaneous magnetization equivalent to that of the bulk of manganese-aluminum alloy and also a high magnetic anisotropy.In addition, a magnetic recording medium comprises a substrate and a magnetic film formed on the substrate, the magnetic film being a thin film in a stacked structure of thin layers of manganese and thin layers of aluminum, laid open upon one another alternatingly in the film thickness direction.Finally, a manganese-silicon magnetic multi-layer film comprises thin layers of manganese and thin layers of silicon laid upon one another alternatingly.

    摘要翻译： 锰和铝的铁磁薄膜在垂直于膜平面的方向上具有不同的锰和铝原子浓度，优选Mn原子浓度优选在45至65原子％的范围内，具有等同于其的自发磁化强度 的大量锰 - 铝合金，也具有高磁各向异性。 此外，磁记录介质包括基板和形成在基板上的磁性膜，该磁性膜是薄膜层叠结构的薄膜和薄层的铝层，在薄膜中交替地相互铺设 厚度方向。 最后，锰 - 硅磁性多层膜交替地包含彼此相互沉积的锰和薄层的薄层。