Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Patent
1997-06-30
2000-12-26
Davis, David
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
360320, G11B 5127
Patent
active
061668915
ABSTRACT:
A magnetoresistive read sensor fabricated on a substrate includes a ferromagnetic layer that is exchange coupled with an antiferromagnetic layer made of a defined composition of iridium manganese. A tantalum layer is used so that the exchange field and coercivity do not change with variations in annealing temperature. The antiferromagnetic layer is formed with a material composition of Ir.sub.x Mn.sub.100-x, wherein x is in the range of 15<.times.>23. In an embodiment of a spin valve structure, the tantalum layer is disposed over the substrate and the antiferromagnetic layer is in direct contact with a pinned ferromagnetic layer. In another embodiment, the IrMn layer is formed over a soft active layer. In a third embodiment using exchange pinning, spaced IrMn regions are formed over the active magnetoresistive layer to define the sensor track width.
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Lederman Marcos M.
Nepela Daniel A.
Tong Hua-Ching
Davis David
Kallman Nathan N.
Read-Rite Corporation
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