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Primary Examiner: Konick, Bernard
Assistant Examiner: Lucas, Jay P.
Attorney: Pershon; James A.

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Title: Magnetoresistive multitransducer assembly with compensation elements for thermal drift and bias balancing

Abstract: An extra MR element is vapor deposited together with a plurality of MR read elements in a head assembly to balance the bias signal and to compensate for thermal drift. The compensation MR element is connected to one input of differential amplifiers whose second input is connected to the read elements. Separate compensation elements can be used to balance an AC bias current distribution by paired 180.degree. out-of-phase operation to prevent overloading of the common ground return lead.

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Inventors: Schwarz, Theodore Albert (Saratoga, CA, US)

Application Number: 611466
Filing Date: 1975-09-08
Publication_date: 1976-09-07
Assignee: International Business Machines Corporation (Armonk, NY)
Primary Class(es): 360/315 324/252, 360/66, 360/67, 360/123, 360/316
Other Classes:
US Patent Ref:

3860965	Jan, 1975	Voegeli	360/113.
3881190	Apr, 1975	Brock	360/113.
3918091	Nov, 1975	Walraven	360/113.

Other Refs: Other References: IBM Technical Disc. Bull., Balanced Resistance MR Head Compensated R. Anderson et al, vol. 17, No. 11 Apr. 1975, p. 3478.
IBM Technical Disc. Bull., Magnetoresistive Current Sensor, A. J. Bowen, vol. 17, No. 3, Aug. 1974 p. 728.
IBM Tech. Disc. Bull., Resistive Element for Bias and Noise Cancellation of Magnetoresistive Head, vol. 17, No. 9 Feb. 1975 p. 2759.
IBM Tech. Discl. Bull. Balanced Magnetic Head, O'Day, vol. 15, No. 9 Feb. 1973 p. 2680.