发明名称 |
Novel hard bias design for extra high density recording |
摘要 |
A hard bias structure for biasing a free layer in a MR element within a read head is comprised of a composite hard bias layer having a Co78.6Cr5.2Pt16.2/Co65Cr15Pt20 configuration. The upper Co65Cr15Pt20 layer has a larger Hc value and a thickness about 2 to 10 times greater than that of the Co78.6Cr5.2Pt16.2 layer. The hard bias structure may also include a BCC underlayer such as FeCoMo which enhances the magnetic moment of the hard bias structure. Optionally, the thickness of the Co78.6Cr5.2Pt16.2 layer is zero and the Co65Cr15Pt20 layer is formed on the BCC underlayer. The present invention also encompasses a laminated hard bias structure. The Mrt value for the hard bias structure may be optimized by adjusting the thicknesses of the BCC underlayer and CoCrPt layers. As a result, a larger process window is realized and lower asymmetry output during a read operation is achieved.
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申请公布号 |
US2010172053(A1) |
申请公布日期 |
2010.07.08 |
申请号 |
US20100660908 |
申请日期 |
2010.03.05 |
申请人 |
HEADWAY TECHNOLOGIES, INC. |
发明人 |
ZHANG KUNLIANG;LI YUN-FEI;TORNG CHYU-JIUH;CHIEN CHEN-JUNG |
分类号 |
G11B5/187;B05D1/36;G11B5/127;G11B5/33;G11B5/39 |
主分类号 |
G11B5/187 |
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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