Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2007-10-30
2007-10-30
Wellington, Andrea (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
C360S313000, C360S324100
Reexamination Certificate
active
10977300
ABSTRACT:
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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Carey Matthew J.
Childress Jeffrey R.
Maat Stefan
Berthold Thomas R.
Garr Jason M.
Hitachi Global Storage Technologies - Netherlands B.V.
Wellington Andrea
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