Differential magnetoresistive sensor for vertical recording

Details Differential magnetoresistive sensor for vertical recording Differential magnetoresistive sensor for vertical recording

1982-08-30

1986-05-13

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Head

Hall effect

360115, 360110, 338 32R, 324252, 365 8, G11B 5127, G11B 533, G01R 3302, G11C 1908

Patent

active

045890412

ABSTRACT:
An MR sensor is disclosed in which a pair of thin film magnetoresistive strips are connected electrically in parallel between two terminals. Strips are spaced apart a distance which is small relative to the density of the stored data to be sensed. The strips are mutually-biased in opposite directions to corresponding points in the linear region of their respective curves by current from a constant source attached to one terminal. Since the resistance of each strip is equal, the current divides equally between the strips.
The sensor is positioned adjacent the magnetic surface containing stored data. Vertical components of the magnetic field (preferably vertically recorded data) influence the resistance of the strips differentially. When the sensor encounters a vertical flux transition, the output voltage varies to produce a unimodal type pulse.

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IBM Technical Disclosure Bulletin, vol. 17, No. 11, p. 3437, Apr. 1975, "Resistance Matching for Coupled-Film MR Elements".
IBM Technical Disclosure Bulletin, vol. 15, No. 9, Feb. 1973, "Balanced Magnetic Head", by R. L. O'Day.
IBM Technical Disclosure Bulletin, vol. 17, No. 11, pp. 3478-3480, Apr. 1975, "Bal. Resistance MR Head Comp. Ther. and Pioz. EFF.".

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