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51. 发明授权

US06221519B1 Magnetic recording medium and process for producing the same 失效
标题翻译：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。

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