发明授权
- 专利标题: Perpendicular magnetic recording medium and a method of manufacturing the same
- 专利标题(中): 垂直磁记录介质及其制造方法
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申请号: US10227622申请日: 2002-08-23
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公开(公告)号: US07067206B2公开(公告)日: 2006-06-27
- 发明人: Hiroyuki Uwazumi , Yasushi Sakai , Tadaaki Oikawa , Miyabi Nakamura
- 申请人: Hiroyuki Uwazumi , Yasushi Sakai , Tadaaki Oikawa , Miyabi Nakamura
- 申请人地址: JP
- 专利权人: Fuji Electric Co., Ltd.
- 当前专利权人: Fuji Electric Co., Ltd.
- 当前专利权人地址: JP
- 代理机构: Rossi, Kimms & McDowell, LLP
- 优先权: JP2001-264517 20010831
- 主分类号: G11B5/66
- IPC分类号: G11B5/66 ; G11B5/76
摘要:
A perpendicular magnetic recording medium has a granular magnetic layer and a nonmagnetic underlayer of a metal or an alloy having a hexagonal close packed (hcp) crystal structure. A seed layer of a metal or an alloy of a face-centered cubic (fcc) crystal structure is provided under the nonmagnetic underlayer. Such a perpendicular magnetic recording medium exhibits excellent magnetic characteristics even when the thickness of the underlayer or the total thickness of the underlayer and the seed layer is very thin. Excellent magnetic characteristics can be obtained even when of the substrate is not preheated. Accordingly, a nonmagnetic substrate, such as a plastic resin can be employed to reduce the manufacturing cost.
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