发明名称 |
CPP Magnetoresistive Sensor and CPP Read Head |
摘要 |
<p>A current-perpendicular-to-the-plane spin-valve (CPP-SV) magnetoresistive sensor has an improved antiparallel (AP) pinned structure. The AP-pinned structure has two ferromagnetic layers separated by a nonmagnetic antiparallel coupling (APC) layer and with their magnetization directions oriented antiparallel. One of the ferromagnetic layers in the AP-pinned structure is the reference layer in contact with the CPP-SV sensor's nonmagnetic electrically conducting spacer layer. In the improved AP-pinned structure each of the ferromagnetic layers has a thickness greater than 30 Å, preferably greater than approximately 50 Å, and the APC layer is either Ru or Ir with a thickness less than 7 Å, preferably about 5 Å or less. The ultrathin APC layer, especially if formed of iridium (Ir), provides significant coupling strength to allow the thick ferromagnetic layers to retain their magnetization directions in a stable antiparallel orientation.
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申请公布号 |
EP1653242(A3) |
申请公布日期 |
2008.09.10 |
申请号 |
EP20050105151 |
申请日期 |
2005.06.13 |
申请人 |
HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS B.V. |
发明人 |
CAREY, MATTHEW J.;CHILDRESS, JEFFREY R.;MAAT, STEFAN |
分类号 |
G01R33/09;G11B5/39 |
主分类号 |
G01R33/09 |
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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