Spin valves with high uniaxial anisotropy reference and keeper l

Details Spin valves with high uniaxial anisotropy reference and keeper l Spin valves with high uniaxial anisotropy reference and keeper l

1998-05-27

2000-10-03

Kiliman, Leszek

Stock material or miscellaneous articles

Composite

Of inorganic material

428694R, 428694T, 428694TS, 428694TM, 428900, 360113, 338 32R, 324252, G11B 566

Patent

active

061270539

ABSTRACT:
An SV sensor having a reference (pinned) layer formed of a first high uniaxial anisotropy ferromagnetic material, such as Co--Fe, and a keeper layer formed of a second high uniaxial anisotropy ferromagnetic material, such as Ni--Fe--Nb. Lapping induced stress in the Co--Fe layer having high positive magnetostriction generates a stress-induced uniaxial anisotropy field in the reference layer resulting in enhanced reference layer magnetization. This uniaxial anisotropy field is capable by itself of maintaining a substantial transverse reference layer saturation even at elevated temperatures. Lapping induced stress in the Ni--Fe--Nb layer having high positive magnetostriction generates a stress-induced uniaxial anisotropy field in the keeper layer providing more uniform magnetization and therefore better flux cancellation. The high electrical resistivity of the Ni--Fe--Nb keeper layer has the further benefit of reducing sense current shunting by the keeper layer.

REFERENCES:
patent: 5159513 (1992-10-01), Dieny
patent: 5408377 (1995-04-01), Gurney et al.
patent: 5508867 (1996-04-01), Cain
patent: 5528440 (1996-06-01), Fontana et al.
patent: 5574605 (1996-11-01), Baumgart et al.
patent: 5583725 (1996-12-01), Coffey
patent: 5648885 (1997-07-01), Nishioka et al.
Ishi "Stress Induced Anisotropy . . . " IEE Transactions on Magnetics. vol. 32. No. 5, Sep. 1996.
T. Ishi et al., "Stress Induced Anistropy Effect for SAL Films in Magnetoresistive Elements", IEEE Trans. on Mags., vol. 32, No. 5, Sep. 1996.

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