发明授权
US07556870B2 Antiferromagnetically coupled media for magnetic recording with weak coupling layer
失效
用于具有弱耦合层的磁记录的反铁磁耦合介质
- 专利标题: Antiferromagnetically coupled media for magnetic recording with weak coupling layer
- 专利标题(中): 用于具有弱耦合层的磁记录的反铁磁耦合介质
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申请号: US11204979申请日: 2005-08-15
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公开(公告)号: US07556870B2公开(公告)日: 2009-07-07
- 发明人: Hoa Van Do , Eric Edward Fullerton , David Thomas Margulies , Natacha Frederique Supper
- 申请人: Hoa Van Do , Eric Edward Fullerton , David Thomas Margulies , Natacha Frederique Supper
- 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. Marlin Knight
- 主分类号: G11B5/66
- IPC分类号: G11B5/66
摘要:
An embodiment of the invention is a layered magnetic thin film structure that uses antiferromagnetically coupled (AFC) magnetic layers where the top layer structure consists of an upper magnetic layer that is weakly ferromagnetically coupled via a nonmagnetic or weakly magnetic exchange coupling layer (interlayer) to a ferromagnetic exchange enhancing layer that is in turn, AF coupled to the lower ferromagnetic layer of the AFC structure. Preferred materials for the weak coupling layer include alloys of cobalt such as CoRu, CoBRu and CoCr in which the Co content is below the point at which the material would be ferromagnetic. A second embodiment of the invention is a laminated, AF-coupled media structure. In this structure the lower AFC layer that makes up the lower laminate layer includes: the middle magnetic layer, the weak ferromagnetic coupling layer, and the exchange enhancing layer.