发明授权
- 专利标题： Magnetic recording medium, magnetic recording medium manufacturing method, and magnetic disk
- 专利标题（中）： 磁记录介质，磁记录介质制造方法和磁盘
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申请号： US12526866申请日： 2008-02-13
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公开(公告)号： US08076013B2公开(公告)日： 2011-12-13
- 发明人: Yoshiaki Sonobe , Takahiro Onoue , Koichi Wago
- 申请人： Yoshiaki Sonobe , Takahiro Onoue , Koichi Wago
- 申请人地址： SG Singapore
- 专利权人： WD Media (Singapore) Pte. Ltd.
- 当前专利权人： WD Media (Singapore) Pte. Ltd.
- 当前专利权人地址： SG Singapore
- 优先权： JP2007-031750 20070213; JP2007-031751 20070213
- 国际申请： PCT/JP2008/052372 WO 20080213
- 国际公布： WO2008/099859 WO 20080821
- 主分类号： G11B5/667
- IPC分类号： G11B5/667
摘要：
A magnetic recording medium (10) has a substrate (12) and a perpendicular magnetic recording layer (30) formed over the substrate (12). The perpendicular magnetic recording layer (30) has a granular layer (20) in which a magnetic signal is recorded and a continuous film layer (24) magnetically coupled to the granular layer (20). The continuous film layer (24) has hard magnetic portions (204) formed in positions corresponding to the recording regions where magnetic signals are recorded in the granular layer (20) and magnetic shield portions (202) formed between the hard magnetic portions (204), each having a magnetization curve whose slope is larger than those of the hard magnetic portions in the region where the applied magnetic filed is zero when the magnetization curve is measured, and each having a residual magnetic polarization smaller than those in the hard magnetic portions.