发明授权
- 专利标题： Perpendicular magnetic recording medium
- 专利标题（中）： 垂直磁记录介质
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申请号： US685838申请日： 1984-12-24
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公开(公告)号： US4725482A公开(公告)日： 1988-02-16
- 发明人: Tomohisa Komoda , Mamoru Ishizuka , Shuhei Tsuchimoto , Mitsuhiko Yoshikawa
- 申请人： Tomohisa Komoda , Mamoru Ishizuka , Shuhei Tsuchimoto , Mitsuhiko Yoshikawa
- 申请人地址： JPX Osaka
- 专利权人： Sharp Kabushiki Kaisha
- 当前专利权人： Sharp Kabushiki Kaisha
- 当前专利权人地址： JPX Osaka
- 优先权： JPX58-249983 19831227
- 主分类号： G11B5/64
- IPC分类号： G11B5/64 ; G11B5/66 ; G11B5/72
摘要：
A Co-Cr perpendicular magnetic recording medium includes a chromium oxide film formed on a Co-Cr perpendicular magnetization film, and a SiO.sub.2 protective film formed on the chromium oxide film. The chromium oxide film is formed by conducting a heating treatment to the surface of the Co-Cr perpendicular magnetization film in an oxygen atmosphere of about 10.sup.-4 to 10.sup.-3 Torr, at a temperature of about 300.degree. C. to 400.degree. C. for about two hours. The chromium oxide film has a thickness of about 20 to 200 .ANG.. The SiO.sub.2 protective film has a thickness greater than 50 .ANG., but the total thickness of the chromium oxide film and the SiO.sub.2 protective film is selected between 70 and 300 .ANG..
公开/授权文献
- US5766431A Electrolyzer 公开/授权日：1998-06-16