Dynamic magnetic information storage or retrieval – Head – Hall effect
Patent
1987-10-30
1989-04-25
Heinz, A. J.
Dynamic magnetic information storage or retrieval
Head
Hall effect
G11B 530
Patent
active
048253251
ABSTRACT:
A magnetoresistive (MR) sensor which is provided with longitudinal bias by means of exchange coupling between the ferromagnetic MR layer (NiFe) and an ultrathin layer of an antiferromagnetic material (FeMn) with a thickness within the range of about 25 to 200 angstroms. The exchange structure is capped by a protective film to prevent oxidation damage to the exchange structure during subsequent thermal cycling. The capping layer is a dielectric or metal oxide (cermet) film such as Cr.sub.2 O.sub.3, Al.sub.2 O.sub.3, Cr - SiO or Si O.sub.2. Alternatively, the capping layer can be a laminated FeMn-Lx film where Lx is taken from the group consisting of Cr.sub.2 O.sub.3, Al.sub.2 O.sub.3, and Si O.sub.2.
REFERENCES:
patent: 4103315 (1978-07-01), Hempstead et al.
patent: 4608293 (1986-08-01), Wada et al.
patent: 4610935 (1986-09-01), Kumasaka et al.
patent: 4663685 (1987-05-01), Tsang
IBM Tech. Discl. Bull., vol. 18, No. 10, Mar. 1976, p. 3422, entitled "Exchange Coupled Magnetic Recording Structure" by L. Missel and D. A. Nepela.
Heinz A. J.
International Business Machines - Corporation
Schmid, Jr. Otto
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