发明授权
- 专利标题: Magnetic recording medium, method for producing same and magnetic recording apparatus
- 专利标题(中): 磁记录介质,其制造方法和磁记录装置
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申请号: US796830申请日: 1991-11-25
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公开(公告)号: US5280401A公开(公告)日: 1994-01-18
- 发明人: Youichi Inomata , Yoshiki Kato , Masaki Ohura
- 申请人: Youichi Inomata , Yoshiki Kato , Masaki Ohura
- 申请人地址: JPX Tokyo
- 专利权人: Hitachi, Ltd.
- 当前专利权人: Hitachi, Ltd.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX2-321900 19901126
- 主分类号: G11B5/64
- IPC分类号: G11B5/64 ; G11B5/65 ; G11B5/66 ; G11B5/73 ; G11B5/738 ; G11B5/84 ; G11B5/85 ; G11B5/851
摘要:
The magnetic recording medium includes a nonmagnetic substrate having different values of surface tension corresponding to surface free energy in a predetermined magnetic recording direction and in the direction substantially perpendicular thereto, a magnetic film epitaxially grown on the nonmagnetic substrate, and a protective film on the magnetic film. The surface of the nonmagnetic substrate is provided with irregular surfaces having gradients of 45 degrees .+-.10 degrees relative to the substrate surface. The magnetic film has a main component of an easy axis of magnetization in the magnetic recording direction. The hydrogen peroxide aqueous solution and nitric acid used for the surface treatment of the substrate affect differently the critical surface tension. The partial nonmetal layer can be partially worked to provide textures extending in the magnetic recording direction. The nonmagnetic substrate and the magnetic film are respectively made of substantially nickel-phosphorus and cobalt, and the partial nonmetal layer is made of carbon.
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