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    Magnetic recording medium and process for producing the same
    1.
    发明公开
    Magnetic recording medium and process for producing the same 有权
    Magnetisches Aufzeichnungsmittel und Verfahren zu seiner Herstellung

    公开(公告)号：EP1274072A1

    公开(公告)日：2003-01-08

    申请号：EP02254652.7

    申请日：2002-07-02

    申请人： Toda Kogyo Corporation

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

    IPC分类号： G11B5/64 ,  G11B5/84

    CPC分类号： G11B5/653 ,  G11B5/851

    摘要： A magnetic recording medium, comprises:

    (i) a substrate;
    (ii) an underlayer provided on the substrate; and
    (iii) a spinel-type iron oxide film which comprises maghemite as a main component and which is provided on the underlayer,
       said spinel-type iron oxide film having a thickness (t) of 5 to 50 nm, being constituted of grains having an average grain size (D) of 5 to 30 nm, a standard deviation of grain sizes 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, and exhibiting 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： 一种磁记录介质，包括：（i）基底; （ii）设置在基板上的底层; 和（iii）尖晶石型氧化铁膜，其包含磁赤铁矿作为主要成分，并且设置在下层上，所述尖晶石型氧化铁膜的厚度（t）为5〜50nm，由具有 平均晶粒尺寸（D）为5〜30nm，晶粒尺寸的标准偏差不大于4nm，平均晶粒尺寸（D）与厚度（t）的比（D / t）小于 1.0，并且在纵向记录介质中表现出不小于159kA / m（2,000Oe）的矫顽力矩和S *不小于0.5:1的矫顽力S *或不小于0.75:1的矩形比， 垂直记录介质。