发明申请
- 专利标题: PERPENDICULAR MAGNETIC RECORDING MEDIUM AND METHOD OF MANUFACTURING THE SAME
- 专利标题(中): 全能磁记录介质及其制造方法
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申请号: US12594092申请日: 2008-03-28
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公开(公告)号: US20100112379A1公开(公告)日: 2010-05-06
- 发明人: Teiichiro Umezawa , Masafumi Ishiyama , Kenji Ayama , Tokichiro Sato
- 申请人: Teiichiro Umezawa , Masafumi Ishiyama , Kenji Ayama , Tokichiro Sato
- 申请人地址: JP Shinjuku-ku, Tokyo SG Singapore
- 专利权人: HOYA CORPORATION,HOYA MAGNETICS SINGAPORE PTE. LTD.
- 当前专利权人: HOYA CORPORATION,HOYA MAGNETICS SINGAPORE PTE. LTD.
- 当前专利权人地址: JP Shinjuku-ku, Tokyo SG Singapore
- 优先权: JP2007-095746 20070330; JP2007-095748 20070330
- 国际申请: PCT/JP2008/056171 WO 20080328
- 主分类号: G11B5/706
- IPC分类号: G11B5/706 ; G11B5/84
摘要:
A vertical magnetic recording disc (100) includes a base (10), a magnetic recording layer (22), and a medium protection layer (26). The magnetic recording layer (22) is a ferromagnetic layer having a granular structure where a granular portion is formed. The medium protection layer (26) contains nitrogen (N) atoms and carbon (C) atoms with a number ratio (N/C) in a range from 0.050 to 0.150. In a Raman spectrum obtained by exciting the medium protection layer (26) by argon ion laser light of wavelength 514.5 nm, from which a fluorescence is removed, the peak ratio Dh/Gh is in a range from 0.70 to 0.95, when a D peak Dh appearing in the vicinity of 1350 cm−1 is separated from G peak Gh appearing in the vicinity of 1520 cm−1 by the Gauss function.
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