Giant magnetoresistive reproduce head having dual magnetoresisti

Details Giant magnetoresistive reproduce head having dual magnetoresisti Giant magnetoresistive reproduce head having dual magnetoresisti

1994-05-25

1995-08-15

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Head

Hall effect

G11B 5127

Patent

active

054425085

ABSTRACT:
A giant magnetoresistance-dual magnetoresistance sensor or reproduce head (GMR-DMR) comprising multilayers of alternating magnetic and nonmagnetic thin film layers arranged such that sets of N sandwiched magnetic and nonmagnetic film layers are formed on either side of the center-most, conductive, nonmagnetic or magnetic film layer, whereby the layered structure operates in the fashion of a dual magnetoresistive sensor or reproduce head and exhibits giant magnetoresistance. Preferably the outer-most magnetic layers are of a thickness that differs from the remaining magnetic film layers in order to reduce self-bias level variance between the outermost and innermost magnetic film layers. Sense current flow through the GMR-DMR structure is induced by sensed magnetic fields and generated giant magnetoresistance changes are detected as head output voltage variations.

REFERENCES:
patent: 5084794 (1992-01-01), Smith
patent: 5159513 (1992-10-01), Dieny et al.
patent: 5168760 (1992-12-01), Wun-Fogle et al.
patent: 5193038 (1993-03-01), Smith
patent: 5206590 (1993-04-01), Dieny et al.
patent: 5287238 (1994-02-01), Baumgart
T. L. Hylton et al, "Giant Magnetoresistance at Low Fields in Discontinuous NiFe-Ag Multilayer Thin Films", Science, vol. 261; pp. 1021-4, Aug. 20, 1993.
N. Smith et al, "Analysis of a Dual Magnetoresistive Head", IEEE Trans. Mag., vol. 28, No. 5; pp. 2295-7, Sep. 1992.
N. Smith et al, "Micromagnetic Modeling of a Narrow-Track Dual Magnetoresistive Head", IEEE Trans. Mag., vol. 30, No. 2, Mar. 1994.

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