Multilayer hard bias films for longitudinal biasing in magnetore

Details Multilayer hard bias films for longitudinal biasing in magnetore Multilayer hard bias films for longitudinal biasing in magnetore

1994-09-26

1995-07-18

Jordan, Charles T.

Communications, electrical: acoustic wave systems and devices

Signal transducers

360113, H01L 4300, G11B 539

Patent

active

054348269

ABSTRACT:
A magnetoresistive transducer includes a magnetoresistive layer having end portions spaced by a central active portion. The longitudinal bias for the magnetoresistive layer is cooperatively furnished by a pair of hard magnetic bias regions. Each of the two hard magnetic bias regions includes a plurality of magnetized layers and each bias region is disposed in contact with one of the end portions of the magnetoresistive transducer. The magnetic flux required for the magnetoresistive layer to maintain a single domain state is adequately provided by the hard magnetic bias regions. In one embodiment, a substantially uniform thickness for the entire transducer is achieved, allowing the longitudinal bias to be continuously supplied to the magnetoresistive layer. In another embodiment, thinner hard magnetic bias regions provide improved step coverage for the second read gap thereby increasing yield. Also the thinner hard magnetic bias regions provide a significant increase of planarization of the write poles.

REFERENCES:
patent: 5079035 (1992-01-01), Krounbi et al.
patent: 5268806 (1993-12-01), Goubau et al.
patent: 5285339 (1994-02-01), Chen et al.
patent: 5325253 (1994-06-01), Chen et al.
patent: 5341118 (1994-08-01), Parkin et al.

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