发明授权
- 专利标题: Laminated magnetic thin films with weak antiferromagnetic coupling for perpendicular magnetic recording
- 专利标题(中): 用于垂直磁记录的具有弱反铁磁耦合的层压磁性薄膜
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申请号: US11134746申请日: 2005-05-19
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公开(公告)号: US07529065B2公开(公告)日: 2009-05-05
- 发明人: Eric Edward Fullerton , Olav Hellwig , Byron Hassberg Lengsfield, III , David T. Margulies
- 申请人: Eric Edward Fullerton , Olav Hellwig , Byron Hassberg Lengsfield, III , David T. Margulies
- 申请人地址: NL Amsterdam
- 专利权人: Hitachi Global Storage Technologies Netherlands B.V.
- 当前专利权人: Hitachi Global Storage Technologies Netherlands B.V.
- 当前专利权人地址: NL Amsterdam
- 代理商 G. Martin Knight
- 主分类号: G11B5/66
- IPC分类号: G11B5/66
摘要:
The invention uses an upper and lower magnetic layer of a laminated magnetic layer structure that includes an AF spacer layer that results in weak antiferromagnetic coupling of the magnetic layers that is insufficient to cause either of the layers to switch so that the magnetic orientations of the two ferromagnetic layers remain parallel. An advantage of the invention is that the AF-coupling tends to anti-correlate the noise in the two layers. The weak AF coupling according to the invention is believed to act at the transition boundaries in the media to cause some of the noise domains to be oriented antiparallel and the noise to be less correlated than would be the case without the AF coupling and thereby to achieve improved SNR.
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