发明名称 |
Perpendicular magnetic recording head laminated with AFM-FM phase change material |
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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申请公布号 |
US8446692(B2) |
申请公布日期 |
2013.05.21 |
申请号 |
US201113199188 |
申请日期 |
2011.08.22 |
申请人 |
ZHOU YUCHEN;TAKANO KENICHI;LIU KOWANG;ZHANG KUNLIANG;GUAN LIEJIE;DOVEK MORIS;SMYTH JOE;HEADWAY TECHNOLOGIES, INC. |
发明人 |
ZHOU YUCHEN;TAKANO KENICHI;LIU KOWANG;ZHANG KUNLIANG;GUAN LIEJIE;DOVEK MORIS;SMYTH JOE |
分类号 |
G11B5/127;G11B5/147 |
主分类号 |
G11B5/127 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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