Hard bias structure with antiparallel layers

Details Hard bias structure with antiparallel layers Hard bias structure with antiparallel layers

2006-04-04

2006-04-04

Heinz, A. J. (Department: 2653)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

Reexamination Certificate

active

07023671

ABSTRACT:
A magnetic head having a sensor with a free layer, the free layer having a magnetic moment. Hard bias structures are positioned towards opposite ends of the sensor, the hard bias structures stabilizing the magnetic moment of the free layer. Each hard bias structure includes an antiparallel (AP) pinned layer structure and an antiferromagnetic layer positioned towards each of the AP pinned layer structures. Each AP pinned layer structure has a middle pinned layer aligned along a plane of the free layer of the sensor, and outer pinned layers positioned on opposite sides of the middle pinned layer. Each antiferromagnetic layer stabilizes a magnetic moment of the pinned layer closest thereto.

REFERENCES:
patent: 6266218 (2001-07-01), Carey et al.
patent: 2002/0024781 (2002-02-01), Ooshima et al.

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