Stabilization of magnetoresistive sensors using the longitudinal

Details Stabilization of magnetoresistive sensors using the longitudinal Stabilization of magnetoresistive sensors using the longitudinal

1991-09-19

1993-06-01

Wolff, John H.

Dynamic magnetic information storage or retrieval

Head

Hall effect

324252, 338 32R, G11B 539

Patent

active

052165604

ABSTRACT:
A magnetoresistive sensor having a longitudinal field that is produced along its axis and that stabilizes the sensor. The longitudinal field is produced by the current in conductors that are connected to the magnetoresistive sensor elements. By controlling the direction and distribution of the current in the conductors, a longitudinal field is produced that has the required direction and magnitude to stabilize the single domain state of the sensor. The resulting lack of domain wall motion in the sensor during operation prevents instabilities in its electrical output, commonly known as Barkhausen noise. Four different sensor designs are provided that include two single element sensors with two conductors, a dual element sensor with four conductors, and a dual element sensor with three conductors. The ease of implementation makes the stabilized sensor of the present invention superior to conventional approaches that rely on permanent magnets or exchange coupled layers to provide longitudinal bias.

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patent: 4987509 (1991-01-01), Gill et al.
patent: 5027243 (1991-06-01), Gill et al.
C. Tsang et al, "Study of domain formation in small permalloy magnetoresistive elements," Journal of Applied Physics, vol. 53, p. 2602 (1982).
N. Smith, "A specific model for domain-wall nucleation in thin-film Permalloy microelements," Journal of Applied Physics, vol. 63, p. 2932 (1988).

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