Magnetoresistive read transducer

Details Magnetoresistive read transducer Magnetoresistive read transducer

1988-03-28

1989-11-07

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Head

Hall effect

G11B 539

Patent

active

048796190

ABSTRACT:
A magnetoresistive (MR) read transducer comprising a thin film MR layer formed of ferromagnetic material and a nonmagnetic thin film spacer layer in contact with the MR layer. The spacer layer comprises a material selected from the group consisting of nichrome and nichrome with chromium oxide. A thin film of soft magnetic material is deposited in contact with the spacer layer so that a transverse bias is produced in at least a part of the MR layer. A feature of the invention is that the resistivity of the spacer layer can be chosen by selected the ration of nichrome to chromium oxide in the spacer layer. In a specific embodiment the spacer layer extends over only the central region of the MR layer. In case the MR layer is a nickel based alloy, a wet chemical etching process using an etchant comprising an aqueous solution of ceric ammonium nitrate and acetic acid can be used pattern the spacer layer.

REFERENCES:
patent: 3814863 (1974-06-01), O'Day et al.
patent: 3864751 (1975-02-01), Beaulieu et al.
patent: 3967368 (1976-07-01), Brock et al.
patent: 4663685 (1987-05-01), Tsang
patent: 4713708 (1987-12-01), Krounbi et al.
patent: 4755897 (1988-07-01), Howard
patent: 4800457 (1989-01-01), Kryder et al.

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