Sensor with in-stack bias structure providing exchange...

Details Sensor with in-stack bias structure providing exchange... Sensor with in-stack bias structure providing exchange...

2008-01-29

2008-01-29

Miller, Brian E. (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

C338S03200R, C324S252000

Reexamination Certificate

active

07324312

ABSTRACT:
A magnetic head having an in-stack bias structure and a free layer structure. The in-stack bias structure includes an antiferromagnetic layer; a first bias layer positioned towards the antiferromagnetic layer, a magnetic moment of the first bias layer being pinned by the antiferromagnetic layer; a first antiparallel coupling layer positioned adjacent the first bias layer; and a second bias layer positioned between the first and second antiparallel coupling layers and having a magnetic moment pinned antiparallel to the magnetic moment of the first bias layer. A second antiparallel coupling layer is positioned adjacent the second bias layer of the bias structure. The free layer structure, positioned adjacent the antiparallel coupling layer, includes a first free layer having a magnetic moment and a second free layer having a magnetic moment pinned antiparallel to the magnetic moment of the first free layer. The second bias layer is antiparallel coupled to the first free layer of the free layer structure for stabilizing the free layer structure.

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