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    Perpendicular magnetic recording medium
    4.
    发明授权
    Perpendicular magnetic recording medium 有权
    垂直磁记录介质

    公开(公告)号：US07993765B2

    公开(公告)日：2011-08-09

    申请号：US10898348

    申请日：2004-07-26

    申请人： Kong Kim ,  Kinobu Osakabe ,  Junichi Horikawa

    发明人： Kong Kim ,  Kinobu Osakabe ,  Junichi Horikawa

    IPC分类号： G11B5/667 ,  G11B5/66

    CPC分类号： G11B5/667 ,  G11B5/7325

    摘要： In a perpendicular magnetic recording medium which includes a substrate (1) of a nonmagnetic material, first and second nonmagnetic underlayers (4 and 5) formed on the substrate, and a perpendicular magnetic recording layer (6) formed on the first and the second nonmagnetic underlayers, the first nonmagnetic underlayer is made of an amorphous nonmagnetic metal material containing a metal element which forms a face-centered cubic (fcc) crystal structure by a simple substance. The second nonmagnetic underlayer is formed on the first nonmagnetic underlayer in contact with the first nonmagnetic underlayer and made of a nonmagnetic material containing a hexagonal close packed structure. The perpendicular magnetic recording layer is formed on the second nonmagnetic underlayer in contact with the second nonmagnetic layer.

    摘要翻译： 在包括非磁性材料的衬底（1）的垂直磁记录介质中，形成在衬底上的第一和第二非磁性底层（4和5）和形成在第一和第二非磁性材料上的垂直磁记录层（6） 底层，第一非磁性底层由含有通过简单物质形成面心立方（fcc）晶体结构的金属元素的非晶非磁性金属材料制成。 第二非磁性底层形成在与第一非磁性底层接触的第一非磁性底层上，并由含有六方密堆积结构的非磁性材料制成。 垂直磁记录层形成在与第二非磁性层接触的第二非磁性底层上。

    PERPENDICULAR MAGNETIC RECORDING DISK AND MANUFACTURING METHOD THEREOF
    5.
    发明申请
    PERPENDICULAR MAGNETIC RECORDING DISK AND MANUFACTURING METHOD THEREOF 有权
    全能磁记录盘及其制造方法

    公开(公告)号：US20090081483A1

    公开(公告)日：2009-03-26

    申请号：US11909598

    申请日：2006-03-20

    申请人： Yoshiaki Sonobe ,  Teiichiro Umezawa ,  Kong Kim ,  Masaki Uemura

    发明人： Yoshiaki Sonobe ,  Teiichiro Umezawa ,  Kong Kim ,  Masaki Uemura

    IPC分类号： G11B5/738 ,  B05D1/36

    CPC分类号： G11B5/7325 ,  G11B5/66

    摘要： A magnetic disk 10 for use in perpendicular magnetic recording, which includes an underlayer 18, a size-reduction promoting layer 20 (nonmagnetic granular layer) of a granular structure, and a magnetic recording layer 22 having a ferromagnetic layer 32 of a granular structure. The size-reduction promoting layer 20 has an inorganic oxide matrix and nonmagnetic metal crystal grains and is disposed between the underlayer 18 and the ferromagnetic layer 32, thereby reducing the size of magnetic crystal grains in the ferromagnetic layer 32.

    摘要翻译： 用于垂直磁记录的磁盘10，其包括底层18，粒状结构的尺寸减小促进层20（非磁性粒状层）和具有粒状结构的铁磁层32的磁记录层22。 尺寸减小促进层20具有无机氧化物基体和非磁性金属晶粒，并且设置在底层18和铁磁层32之间，从而减小铁磁层32中的磁晶粒的尺寸。

    Method of manufacturing a perpendicular magnetic recording medium
    8.
    发明授权
    Method of manufacturing a perpendicular magnetic recording medium 有权
    制造垂直磁记录介质的方法

    公开(公告)号：US08298689B2

    公开(公告)日：2012-10-30

    申请号：US12602430

    申请日：2008-05-30

    申请人： Yoshiaki Sonobe ,  Kong Kim

    发明人： Yoshiaki Sonobe ,  Kong Kim

    IPC分类号： G11B5/66

    CPC分类号： G11B5/667 ,  G11B5/7325 ,  G11B5/851

    摘要： [PROBLEMS] To provide a process for producing a magnetic recording medium, which can simultaneously realize increased high recording density, high impact resistance, and prevention of corrosion, by providing an underlayer which, even when formed at a low gas pressure, can exhibit a high level of coercive force.[MEANS FOR SOLVING PROBLEMS] A process for producing a perpendicular magnetic recording medium, comprising the step of forming a nonmagnetic underlayer (18) having a granular structure, in which crystal particles are grown in a column form, on a substrate, and forming a magnetic recording layer (20) having a granular structure in which magnetic particles are grown in a column form. The process is characterized in that the underlayer (18) is any one of CoCr or CoCrX (wherein X is a nonmagnetic material), CoCr-oxide, and CoCrX-oxide, and the film forming gas pressure of the underlayer (18) is not more than 4 Pa.

    摘要翻译： [问题]提供一种制造磁记录介质的方法，其可以同时实现增加的高记录密度，高抗冲击性和防止腐蚀，通过提供底层，即使在低气压下形成时， 高水平的矫顽力。 解决问题的方法一种垂直磁记录介质的制造方法，其特征在于，在基板上形成具有以柱状生长结晶粒子的具有粒状结构的非磁性底层（18）的工序， 磁性记录层（20）具有磁性颗粒以柱状生长的粒状结构。 该工艺的特征在于，底层（18）是CoCr或CoCrX（其中X是非磁性材料），CoCr-氧化物和CoCrX-氧化物中的任一种，并且底层（18）的成膜气体压力不是 超过4 Pa。

    PERPENDICULAR MAGNETIC RECORDING MEDIUM AND PERPENDICULAR MAGNETIC RECORDING MEDIUM MANUFACTURING METHOD
    9.
    发明申请
    PERPENDICULAR MAGNETIC RECORDING MEDIUM AND PERPENDICULAR MAGNETIC RECORDING MEDIUM MANUFACTURING METHOD 有权
    全磁磁记录介质和全磁记录介质制造方法

    公开(公告)号：US20100190035A1

    公开(公告)日：2010-07-29

    申请号：US12602446

    申请日：2008-05-30

    申请人： Yoshiaki Sonobe ,  Kong Kim

    发明人： Yoshiaki Sonobe ,  Kong Kim

    IPC分类号： G11B5/66 ,  G11B5/84

    CPC分类号： G11B5/656 ,  G11B5/66 ,  G11B5/667 ,  G11B5/7325

    摘要： [Problems] To provide a reinforcing layer between a main recording layer and a continuous layer so as to improve the S/N ratio of a magnetic recording medium and reduce the write fringing effect by the new configuration.[Means for Solving Problems] A perpendicular magnetic recording medium (100) includes a substrate (110), and a main recording layer (122), a reinforcing layer (124), and a continuous layer (126) which are overlaid in this order on the substrate. The reinforcing layer (124) has a granular structure. The saturation magnetization Ms of the reinforcing layer (124) is higher than the saturation magnetization of the main recording layer (122).

    摘要翻译： 为了提高磁记录介质的S / N比，提供主记录层和连续层之间的增强层，通过新结构降低写入边缘效果。 解决问题的手段垂直磁记录介质（100）包括基板（110），主记录层（122），加强层（124）和连续层（126） 在基板上。 加强层（124）具有粒状结构。 加强层（124）的饱和磁化强度Ms高于主记录层（122）的饱和磁化强度。