Magnetoresistive read transducer and method for making the impro

Details Magnetoresistive read transducer and method for making the impro Magnetoresistive read transducer and method for making the impro

1988-03-25

1989-02-28

Hall, Carl E.

Dynamic magnetic information storage or retrieval

Head

Hall effect

29603, 427131, 428611, 428900, G11B 530, G11B 542

Patent

active

048091090

ABSTRACT:
An improved magnetoresistive (MR) read transducer in which a layered structure comprising an antiferromagnetic layer in direct contact with an MR layer is subjected to a thermal annealing process by heating the structure to a temperature within a chosen range for a chosen time so that a new ternary antiferromagnetic alloy is formed by diffusion. The ternary antiferromagnetic alloy has a high value of exchange bias which is less temperature sensitive. In a specific embodiment in which the MR layer is NiFe and the antiferromagnetic layer is FeMn, the ternary alloy formed by heating the structure to a temperature within the range of 260.degree. C. to 350.degree. C. for 50 to 20 hours has a room temperature exchange bias field with NiFe of about 50 Oersted and an ordering temperature which exceeds 300.degree. C.

REFERENCES:
patent: 4103315 (1978-07-01), Hempstead et al.
patent: 4713708 (1987-12-01), Krounbi et al.
IEEE Tran. on Mag. MAG-1, Mar. 1965, pp. 63-65, entitled "Magnetic Properties of Multilayer Films of FeNi--Mn--FeNiCo and of FeNi--Mn" by Massenet et al.
J. Appl. Phys., vol. 39, No. 2, Feb. 1968, pp. 1389-1390, entitled "Spin-Wave Resonance in Epitaxial Fe--Ni Films and in Coupled Double Layers of Epitaxial Fe--Ni and Fe--Ni--Mn" by Waksmann et al.
J. Appl. Phys., vol. 52, No. 3, Mar. 1981, pp. 2471-2473, entitled "Exchange Induced Unidirectional Anisotropy at FeMn--Ni.sub.80 Fe.sub.20 Interfaces" by Tsang et al.

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