发明申请
- 专利标题: Layered return poles for magnetic write heads
- 专利标题(中): 磁性写头的分层返回极
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申请号: US12005558申请日: 2007-12-26
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公开(公告)号: US20090168260A1公开(公告)日: 2009-07-02
- 发明人: Donald G. Allen , Hieu Lam , Terence Tin-Lok Lam , Steve C. Puga
- 申请人: Donald G. Allen , Hieu Lam , Terence Tin-Lok Lam , Steve C. Puga
- 主分类号: G11B5/33
- IPC分类号: G11B5/33
摘要:
Methods and structures for the fabrication of both thin film longitudinal and perpendicular write heads are disclosed. A unique feature of these write heads is the inclusion of layered return poles, which comprise alternating layers of 22/78 and 80/20 NiFe alloys. The alternating layers also vary in thickness, the 22/78 NiFe layers having a nominal thickness of 1500 angstroms and the 80/20 NiFe layers having a nominal thickness of about 75 angstroms. Head efficiency and signal to noise ratios are significantly improved in heads having layered return pole construction.
公开/授权文献
- US07933096B2 Layered return poles for magnetic write heads 公开/授权日:2011-04-26
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