Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2006-09-12
2006-09-12
Klimowicz, William J (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
C360S324200
Reexamination Certificate
active
07106561
ABSTRACT:
A magnetically-coupled structure has two ferromagnetic layers with their in-plane magnetization directions coupled orthogonally across an electrically-conducting spacer layer that induces the direct orthogonal magnetic coupling. The structure has application for in-stack biasing in a current-perpendicular-to-the-plane (CPP) magnetoresistive sensor. One of the ferromagnetic layers of the structure is an antiparallel-pinned biasing layer and the other ferromagnetic layer is the sensor free layer. The antiparallel-pinned biasing layer has first and second ferromagnetic films separated by an antiferromagnetically-coupling film. An antiferromagnetic layer exchange-couples the first ferromagnetic film of the biasing layer to fix the net moment of the biasing layer parallel to the moment of the sensor pinned layer. This allows a single annealing step to be used to set the magnetization direction of the biasing and pinned layers.
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Carey Matthew J.
Childress Jeffrey R.
Ho Kuok San
Maat Stefan
Berthold Thomas R.
Hitachi Global Storage Technologies - Netherlands B.V.
Klimowicz William J
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