发明申请
- 专利标题: Perpendicular magnetic recording medium with laminated recording layers formed of exchange-coupled ferromagnetic layers
- 专利标题(中): 具有由交换耦合铁磁层形成的层压记录层的垂直磁记录介质
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申请号: US11403468申请日: 2006-04-12
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公开(公告)号: US20070243418A1公开(公告)日: 2007-10-18
- 发明人: Eric Fullerton , David Margulies , Hal Rosen , Natacha Supper
- 申请人: Eric Fullerton , David Margulies , Hal Rosen , Natacha Supper
- 主分类号: G11B5/66
- IPC分类号: G11B5/66
摘要:
A laminated perpendicular magnetic recording medium has two recording layers (RL1 and RL2) that are separated and magnetically decoupled by a nonmagnetic spacer layer (SL). The SL has a thickness and composition to assure there is no antiferromagnetic or ferromagnetic coupling between RL1 and RL2. Thus in the presence of the write field, RL1 and RL2 respond independently and become oriented with the direction of the write field. Each RL is an “exchange-spring” type magnetic recording layer formed of two ferromagnetic layers (MAG1 and MAG2) that have substantially perpendicular magnetic anisotropy and are ferromagnetically exchange-coupled by a nonmagnetic or weakly ferromagnetic coupling layer (CL). The medium takes advantage of lamination to attain higher signal-to-noise ratio (SNR) yet has improved writability as a result of each RL being an exchange-spring type RL.
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