Magneto-resistive sensor with opposing currents for reading perp

Details Magneto-resistive sensor with opposing currents for reading perp Magneto-resistive sensor with opposing currents for reading perp

1988-06-21

1989-10-31

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Head

Hall effect

G11B 539

Patent

active

048781401

ABSTRACT:
A sensor for reading perpendicularly recorded media includes dual magneto-resistive elements. Directionally opposed currents through respective elements each serve both sensing and bias functions. A detector differentially detects changes in the resistance of the stripes so as to presume common mode noise rejection when reading perpendicular recording media. In addition, the opposing currents offset each other's interaction with the soft magnetic underlayer of the media, which interaction could otherwise perturb the information stored on the media. Provision is made for switching the relative direction of current flow to provide for reading longitudinally recorded media.

REFERENCES:
patent: 3860965 (1975-01-01), Voegeli
patent: 4179720 (1979-12-01), Miura
patent: 4306215 (1981-12-01), Jeffers
patent: 4356523 (1982-10-01), Yeh
patent: 4447839 (1984-05-01), Desserre
patent: 4589041 (1986-05-01), Voegeli

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