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    Magnetic recording medium, method of manufacture therefor, and magnetic read/write apparatus
    1.
    发明授权
    Magnetic recording medium, method of manufacture therefor, and magnetic read/write apparatus 失效
    磁记录介质，其制造方法和磁读/写装置

    公开(公告)号：US06723458B2

    公开(公告)日：2004-04-20

    申请号：US10218570

    申请日：2002-08-15

    申请人： Kenji Shimizu ,  Akira Sakawaki ,  Hui Yang ,  Hiro Mochizuki ,  Hiroshi Sakai ,  Takashi Hikosaka ,  Futoshi Nakamura

    发明人： Kenji Shimizu ,  Akira Sakawaki ,  Hui Yang ,  Hiro Mochizuki ,  Hiroshi Sakai ,  Takashi Hikosaka ,  Futoshi Nakamura

    IPC分类号： G11B566

    CPC分类号： G11B5/667 ,  G11B5/656 ,  G11B5/7325 ,  Y10S428/90

    摘要： A magnetic recording medium that is capable of recording and reading back information at a higher density by improving the read/write characteristics and thermal stability, a method of manufacture therefor, and a magnetic read/write apparatus are provided. This magnetic recording medium, comprises an orientation control film that controls the orientation of a film provided directly thereabove, a perpendicular magnetic film, of which the axis of easy magnetization is generally oriented perpendicular to a non-magnetic substrate, and a protective film, that are provided on the non-magnetic substrate, wherein the perpendicular magnetic film is made of a material which contains Co, Cr, Pt and Cu, the Cr content being 16 at % to 24 at % and the Cu content being 0.1 at % to 4 at %, and a coercive force (Hc) of the perpendicular magnetic film being at least 3000 (Oe), negative nucleation field (−Hn) being 0 (Oe) to 2500 (Oe), and a ratio of residual magnetization (Mr) to saturation magnetization (Ms) being at least 0.85.

    摘要翻译： 提供能够通过改善读/写特性和热稳定性而以更高密度记录和读回信息的磁记录介质，其制造方法和磁读/写装置。 这种磁记录介质包括控制直接在其上设置的膜的取向的取向控制膜，容易磁化轴垂直于非磁性基板的垂直磁性膜和保护膜，其中 设置在非磁性基板上，其中垂直磁性膜由含有Co，Cr，Pt和Cu的材料制成，Cr含量为16at％至24at％，Cu含量为0.1at％至4 （Oe），负成核场（-Hn）为0（Oe）〜2500（Oe），剩余磁化强度（Mr））为0以上，垂直磁性膜的矫顽力（Hc）为3000 饱和磁化强度（Ms）至少为0.85。

    Magnetic recording medium, method of manufacturing the same, and magnetic recording and reproduction apparatus
    4.
    发明授权
    Magnetic recording medium, method of manufacturing the same, and magnetic recording and reproduction apparatus 失效
    磁记录媒体及其制造方法以及磁记录再生装置

    公开(公告)号：US07141315B2

    公开(公告)日：2006-11-28

    申请号：US10630751

    申请日：2003-07-31

    申请人： Kenji Shimizu ,  Akira Sakawaki ,  Hiroshi Sakai ,  Takashi Hikosaka ,  Futoshi Nakamura

    发明人： Kenji Shimizu ,  Akira Sakawaki ,  Hiroshi Sakai ,  Takashi Hikosaka ,  Futoshi Nakamura

    IPC分类号： G11B5/66 ,  G11B5/70

    CPC分类号： G11B5/667 ,  G11B5/7325

    摘要： A magnetic recording medium includes a nonmagnetic substrate on which is provided at least a soft magnetic under-film, an orientation control film that controls an orientation of a film directly above, a perpendicular magnetic recording film having an axis of easy magnetization oriented to be mainly perpendicular to the substrate and a protective film, wherein the orientation control film is alloy containing at least Cr and C. The magnetic recording medium is manufactured by a method including carrying out, in order, at least a step of forming a soft magnetic under-film on a nonmagnetic substrate, a step of forming an orientation control film that controls an orientation of a film directly above, a step of forming a perpendicular magnetic recording film having an axis of easy magnetization oriented to be mainly perpendicular to the substrate, and a step of forming a protective film. A magnetic recording and reproduction apparatus includes the magnetic recording medium and a magnetic head that records and reproduces information on the magnetic recording medium, wherein the magnetic head is a magnetic monopole head.

    摘要翻译： 磁记录介质包括至少设置有软磁性底膜的非磁性基板，控制正上方的膜的取向的取向控制膜，具有容易磁化的轴的垂直磁记录膜主要取向为 垂直于基板和保护膜，其中定向控制膜是至少含有Cr和C的合金。磁记录介质通过一种方法制造，该方法包括依次进行至少一个步骤， 在非磁性基板上形成膜，形成直接控制膜的取向的取向控制膜的步骤，形成具有主要垂直于基板的易磁化轴取向的垂直磁记录膜的步骤，以及 形成保护膜的步骤。 磁记录和再现装置包括磁记录介质和在磁记录介质上记录和再现信息的磁头，其中磁头是磁单极头。