发明授权
- 专利标题： Perpendicular magnetic recording disk and manufacturing method thereof
- 专利标题（中）： 垂直磁记录盘及其制造方法
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申请号： US11909598申请日： 2006-03-20
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公开(公告)号： US08003237B2公开(公告)日： 2011-08-23
- 发明人: Yoshiaki Sonobe , Teiichiro Umezawa , Kong Kim , Masaki Uemura
- 申请人： Yoshiaki Sonobe , Teiichiro Umezawa , Kong Kim , Masaki Uemura
- 申请人地址： US CA San Jose
- 专利权人： WD Media, Inc.
- 当前专利权人： WD Media, Inc.
- 当前专利权人地址： US CA San Jose
- 优先权： JP2005-086220 20050324
- 国际申请： PCT/JP2006/305538 WO 20060320
- 国际公布： WO2006/101072 WO 20060928
- 主分类号： G11B5/66
- IPC分类号： G11B5/66
摘要：
A magnetic disk 10 for use in perpendicular magnetic recording, which includes an underlayer 18, a size-reduction promoting layer 20 (nonmagnetic granular layer) of a granular structure, and a magnetic recording layer 22 having a ferromagnetic layer 32 of a granular structure. The size-reduction promoting layer 20 has an inorganic oxide matrix and nonmagnetic metal crystal grains and is disposed between the underlayer 18 and the ferromagnetic layer 32, thereby reducing the size of magnetic crystal grains in the ferromagnetic layer 32.