发明授权
- 专利标题： Magnetic recording medium, method manufacture therefor, and apparatus for magnetic reproducing and reproducing recordings
- 专利标题（中）： 磁记录介质及其制造方法以及用于磁再现和再现记录的设备
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申请号： US10781906申请日： 2004-02-20
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公开(公告)号： US07056606B2公开(公告)日： 2006-06-06
- 发明人: Kenji Shimizu , Akira Sakawaki , Hiroshi Sakai , Takashi Hikosaka , Soichi Oikawa
- 申请人： Kenji Shimizu , Akira Sakawaki , Hiroshi Sakai , Takashi Hikosaka , Soichi Oikawa
- 申请人地址： JP Tokyo JP Tokyo
- 专利权人： Showa Denko K.K.,Kabushiki Kaisha Toshiba
- 当前专利权人： Showa Denko K.K.,Kabushiki Kaisha Toshiba
- 当前专利权人地址： JP Tokyo JP Tokyo
- 代理机构： Sughrue Mion, PLLC
- 优先权： JPP2001-055950 20010228
- 主分类号： G11B5/65
- IPC分类号： G11B5/65
摘要：
A magnetic recording medium comprising: on a non-magnetic substrate, at least a soft magnetic undercoat film comprising a soft magnetic material; an orientation control film for controlling an orientation of a film directly above; a perpendicular magnetic film in which an axis of easy magnetization is oriented mainly perpendicularly with respect to the substrate; and a protection film, wherein the perpendicular magnetic film has a structure in which a large number of magnetic grains are separated by a grain boundary layer, and an average separating distance between the magnetic grains along a straight line which connects centers of gravity of mutually neighboring magnetic grains is 1 nm or greater.
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