Magnetoresistive sensor having antiferromagnetic layer for excha

Details Magnetoresistive sensor having antiferromagnetic layer for excha Magnetoresistive sensor having antiferromagnetic layer for excha

1992-07-28

1994-05-24

Wolff, John H.

Dynamic magnetic information storage or retrieval

Head

Hall effect

G11B 5127, G11B 533

Patent

active

053154681

ABSTRACT:
A magnetoresistive (MR) sensor comprising a sputtered layer of ferromagnetic material and a sputtered layer of antiferromagnetic nickel-manganese (Ni-Mn) to provide an exchange coupled longitudinal bias field in the MR element is described. The antiferromagnetic layer overlays the MR layer and may be patterned to provide the longitudinal bias field only in the end regions of the MR layer. Alternatively, the antiferromagnetic layer can underlay the MR layer with a Zr underlayer to enhance the exchange-coupled field. As initially deposited, the Ni-Mn layer is face-centered-cubic and exhibits little or no exchange-coupled field. After one annealing cycle at a relatively low temperature, the Ni-Mn layer is face-centered-tetragonal and exhibits increased crystallographic ordering and provides sufficient exchange coupling for the MR element to operate. Addition of chromium to the Ni-Mn alloy provides increased corrosion resistance.

REFERENCES:
patent: 4103315 (1978-07-01), Hempstead et al.
patent: 4663685 (1987-05-01), Tsang
patent: 4755897 (1988-07-01), Howard
patent: 4782413 (1988-11-01), Howard et al.
patent: 4809109 (1989-02-01), Howard et al.
patent: 5014147 (1991-05-01), Parkin et al.
patent: 5079035 (1992-01-01), Krounbi et al.
Tsang, "Magnetics of small magnetoresistive sensors (invited)", J. Appl. Phys., vol. 55, No. 6, Mar. 15, 1984, pp. 2226-2231.

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