Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2006-10-03
2006-10-03
Heinz, A. J. (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
Reexamination Certificate
active
07116530
ABSTRACT:
A dual/differential spin valve sensor of a magnetic head includes a first spin valve having an antiparallel (AP) “pinned” layer structure and a second spin valve having an AP “self-pinned” layer structure. The AP pinned layer structure has a magnetization direction which is fixed by an adjacent antiferromagnetic (AFM) layer, whereas the AP self-pinned layer structure has a magnetization direction which is fixed by magnetostriction as well as air bearing surface (ABS) stress. The magnetization direction of the AP pinned layer structure is fixed in a direction antiparallel to the magnetization direction of the AP self-pinned layer structure. The dual/differential spin valve sensor may be configured to have either a top AP pinned layer structure and a bottom AP self-pinned layer structure, or a top AP self-pinned layer structure and a bottom AP pinned layer structure. Advantageously, the dual/differential spin valve sensor is relatively thin and overcomes the difficulties of the AFM polarity setting process when two AP pinned layer structures are utilized.
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Heinz A. J.
Hitachi Global Storage Technologies - Netherlands B.V.
Oskorep, Esq. John J.
Zises Matthew
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