Method for making a magnetoresistive read transducer

Details Method for making a magnetoresistive read transducer Method for making a magnetoresistive read transducer

1989-05-22

1990-07-10

Hall, Carl E.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

29603, 1566571, 156667, 360113, 427130, 427131, G11B 542, B44C 122

Patent

active

049405110

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 selecting the ratio 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 to pattern the spacer layer.

REFERENCES:
patent: 3814863 (1974-06-01), O'Day et al.
patent: 3864751 (1975-02-01), Beaulien 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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