发明授权
- 专利标题： Perpendicular magnetic recording head laminated with AFM-FM phase change material
- 专利标题（中）： 垂直磁记录头与AFM-FM相变材料层压
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申请号： US13199188申请日： 2011-08-22
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公开(公告)号： US08446692B2公开(公告)日： 2013-05-21
- 发明人: Yuchen Zhou , Kenichi Takano , Kowang Liu , Kunliang Zhang , Liejie Guan , Moris Dovek , Joe Smyth
- 申请人： Yuchen Zhou , Kenichi Takano , Kowang Liu , Kunliang Zhang , Liejie Guan , Moris Dovek , Joe Smyth
- 申请人地址： US CA Milpitas
- 专利权人： Headway Technologies, Inc.
- 当前专利权人： Headway Technologies, Inc.
- 当前专利权人地址： US CA Milpitas
- 代理机构： Saile Ackerman LLC
- 代理商 Stephen B. Ackerman
- 主分类号： G11B5/127
- IPC分类号： G11B5/127 ; G11B5/147
摘要：
A PMR writer is disclosed that minimizes pole erasure during non-writing and maximize write field during writing through an AFM-FM phase change material that is in an anti-ferromagnetic (AFM) state during non-writing and switches to a ferromagnetic (FM) state by heating during writing. The main pole layer including the write pole may be comprised of a laminated structure having a plurality of “n” ferromagnetic layers and “n−1” AFM-FM phase change material layers arranged in an alternating manner. The AFM-FM phase change material is preferably a FeRh, FeRhPt, FeRhPd, or FeRhIr and may also be used as a flux gate to prevent yoke flux from leaking into the write pole tip. Heating for the AFM to FM transition is provided by write coils and/or a coil located near the AFM-FM phase change material to enable faster transition times.
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