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    Magnetic recording medium and process for producing the same
    3.
    发明授权
    Magnetic recording medium and process for producing the same 失效
    磁记录介质及其制造方法

    公开(公告)号：US06221519B1

    公开(公告)日：2001-04-24

    申请号：US09272622

    申请日：1999-03-19

    申请人： Takanori Doi ,  Kousaku Tamari ,  Yasuo Kakihara ,  Kenichi Nakata ,  Mitsuru Matsuura ,  Setsuo Yamamoto

    发明人： Takanori Doi ,  Kousaku Tamari ,  Yasuo Kakihara ,  Kenichi Nakata ,  Mitsuru Matsuura ,  Setsuo Yamamoto

    IPC分类号： G11B566

    CPC分类号： G11B5/7325 ,  G11B5/656 ,  G11B5/84 ,  G11B5/8404 ,  Y10S428/90

    摘要： A magnetic recording medium comprising: a plastic substrate; a nickel oxide underlayer formed on said substrate; and a cobalt-containing maghemite thin film formed on said nickel oxide underlayer, containing cobalt at a molar ratio of cobalt to iron of 0.01:1 to 0.1:1, and having either a spacing of a plane (311) of not more than 2.510 Å, a spacing of a plane (222) of not more than 2.415 Å or a spacing of a plane (220) of not more than 2.950 Å, a ratio value of an X-ray diffraction pattern peak intensity of either of the planes (311), (222) and (220) of said cobalt-containing maghemite thin film to an X-ray diffraction pattern peak intensity of the plane (400) thereof being more than 0.5. Such magnetic recording medium suitably applicable to existent magnetic recording systems using a ring-type magnetic head and capable of using a plastic substrate for providing a magnetic recording medium for high-density recording.

    摘要翻译： 一种磁记录介质，包括：塑料基板;形成在所述基板上的氧化镍底层; 和在所述氧化镍底层上形成的含钴的磁赤铁矿薄膜，其含有钴与铁的摩尔比为0.01:1至0.1:1的钴，并且具有不大于2.510的平面（311）的间隔 ，平面（222）的间距不大于2.415或平面（220）的间距不大于2.950，任一平面（311）的X射线衍射图峰值强度的比值 ），所述含钴磁赤铁矿薄膜的（222）和（220）相对于所述平面（400）的X射线衍射图峰值强度大于0.5。 这种磁记录介质适用于使用环形磁头的现有磁记录系统，并能够使用塑料基板提供用于高密度记录的磁记录介质。

    Process for producing magnetic recording medium
    5.
    发明授权
    Process for producing magnetic recording medium 失效
    磁记录介质的制造方法

    公开(公告)号：US06268024B1

    公开(公告)日：2001-07-31

    申请号：US09276520

    申请日：1999-03-25

    申请人： Takanori Doi ,  Kousaku Tamari ,  Yasuo Kakihara ,  Kenichi Nakata ,  Mitsuru Matsuura ,  Setsuo Yamamoto

    发明人： Takanori Doi ,  Kousaku Tamari ,  Yasuo Kakihara ,  Kenichi Nakata ,  Mitsuru Matsuura ,  Setsuo Yamamoto

    IPC分类号： H05H100

    CPC分类号： G11B5/7325 ,  G11B5/656 ,  G11B5/84 ,  G11B5/8404

    摘要： A magnetic recording medium is prepared by forming on a plastic substrate, a nickel oxide underlayer having a plane (200) which is predominantly oriented in parallel with the surface of the plastic substrate, then forming on the nickel oxide underlayer at a substrate temperature of less 240° C., a cobalt-containing magnetite thin film having a plane (400) which is predominantly oriented in parallel with the surface of the plastic substrate, and finally oxidizing the cobalt-containing magnetite thin film in a plasma-activated oxygen atmosphere containing a rare gas at a substrate temperature of less than 240° C. while incorporating the rare gas into oxygen. This results in a cobalt-containing maghemite thin film as a perpendicular magnetic film having a spacing of a plane (400) of not more than 2.082 Å. The magnetic recording medium so produced is useful for high-density recording using a plastic substrate.

    摘要翻译： 通过在塑料基板上形成氧化镍底层制备磁记录介质，所述氧化镍底层具有主要与塑料基板的表面平行取向的平面（200），然后在较低的基板温度下在氧化镍底层上形成 240℃的含钴磁铁矿薄膜，其具有主要与塑料基板的表面平行取向的平面（400），最后在等离子体激活的氧气氛中氧化含钴磁铁矿薄膜，其中含有 在低于240℃的衬底温度下的稀有气体，同时将稀有气体并入氧气中。 这导致含有钴的磁赤铁矿薄膜作为垂直磁性膜，其平面（400）的间隔不大于2.082。 所制造的磁记录介质对于使用塑料基板的高密度记录是有用的。

    Magnetic recording medium and process for producing the same
    7.
    发明授权
    Magnetic recording medium and process for producing the same 失效
    磁记录介质及其制造方法

    公开(公告)号：US06821618B2

    公开(公告)日：2004-11-23

    申请号：US10185728

    申请日：2002-07-01

    申请人： Jun Koujima ,  Teruaki Santoki ,  Kenichi Nakata ,  Takanori Doi ,  Masaaki Maekawa ,  Kousaku Tamari

    发明人： Jun Koujima ,  Teruaki Santoki ,  Kenichi Nakata ,  Takanori Doi ,  Masaaki Maekawa ,  Kousaku Tamari

    IPC分类号： C23C1408

    CPC分类号： G11B5/653 ,  G11B5/851 ,  Y10T428/265

    摘要： A magnetic recording medium exhibiting a high coercive force and excellent squareness having a substrate, an underlayer formed on the substrate, and a spinel-type iron oxide thin film with maghemite as a main component formed on the underlayer. The spinel-type iron oxide thin film has a thickness (t) of 5 to 50 nm, is constituted by grains having an average grain size (D) of 5 to 30 nm, standard deviation of sizes of grain of not more than 4 nm and a ratio (D/t) of the average grain size (D) to the thickness (t) of less than 1.0, exhibits a coercive force of not less than 159 kA/m (2,000 Oe) and a coercive squareness ratio S* of not less than 0.5:1 in a longitudinal recording medium or a squareness ratio not less than 0.75:1 in a perpendicular recording medium.

    摘要翻译： 具有高矫顽力和具有基底的优良矩形性的磁记录介质，在基底上形成的底层和在底层上形成有以磁赤铁矿为主要成分的尖晶石型氧化铁薄膜。 尖晶石型氧化铁薄膜的厚度（t）为5〜50nm，由平均粒径（D）为5〜30nm的晶粒构成，粒径不超过4nm的标准偏差 平均粒径（D）与厚度（t）的比（D / t）小于1.0时，矫顽力为159kA / m 2（2000Oe），矫顽截面比S * 在纵向记录介质中不小于0.5:1，或垂直记录介质中不小于0.75:1的矩形比。

    Magnetic recording medium
    8.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US6159594A

    公开(公告)日：2000-12-12

    申请号：US161988

    申请日：1998-09-29

    申请人： Kousaku Tamari ,  Takanori Doi ,  Yasuo Kakihara ,  Kenichi Nakata

    发明人： Kousaku Tamari ,  Takanori Doi ,  Yasuo Kakihara ,  Kenichi Nakata

    IPC分类号： G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/73 ,  G11B5/738 ,  H01F10/16

    CPC分类号： G11B5/7325 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

    摘要： A magnetic recording medium of the present invention comprises:a substrate;a nickel oxide underlayer formed on said substrate; anda cobalt-containing maghemite thin film formed on said nickel oxide underlayer, having either a spacing of a (311) plane of not more than 2.510 .ANG., a spacing of a (222) plane of not more than 2.415 .ANG. or a spacing of a (220) plane of not more than 2.950 .ANG., and having the ratio of either of X-ray diffraction spectrum peak intensities of the (311), (222) or (220) planes of said cobalt-containing maghemite thin film to an X-ray diffraction spectrum peak intensity of the (400) plane of more than 0.5:1.Such a magnetic recording medium has a higher coercive force, a higher saturation magnetization, less amount of noise generated, a large output in a high recording frequency region and less distortion of a reproduced waveform, and is suitable for use in current magnetic recording systems in which a ring-type magnetic write head is used.

    摘要翻译： 本发明的磁记录介质包括：基板; 形成在所述基板上的氧化镍底层; 以及形成在所述氧化镍底层上的含有钴的磁赤铁矿薄膜，其间隔为（311）面不大于2.510安培，（222）面间距不大于2.415安培或间距 （220）面不超过2.950，并且所述含钴磁赤铁矿薄膜的（311），（222）或（220）面的X射线衍射光谱峰值强度与 （400）面的X射线衍射谱峰强度大于0.5：1。 这种磁记录介质具有较高的矫顽力，较高的饱和磁化强度，较少的噪声产生量，高记录频率区域的输出较大，再生波形失真较少，适用于目前的磁记录系统 使用环形磁性写入头。