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US 3,979,775 AGranted
Magnetoresistive multitransducer assembly with compensation elements for thermal drift and bias balancing
AssigneeInternational Business Machines Corporation
InventorTheodore Albert Schwarz
Life of this patent
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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.
Claims12
A head assembly for sensing magnetically recorded information from a medium comprising:
- a plurality of magnetoresistive elements sensing the magnetically recorded information and providing information signals from each indicative of a resistance of each element
- a compensating element, providing a reference signal indicative of its resistance
- a return bias and signal path conductor means providing one input to each element;
- and
- conductor means for supplying a bias current to each element and for providing said information signals and said reference signal, whereby difference signals can be derived by differentially sensing said information signals with said reference signal.
2 more elements
Dependencies are inferred from the claim text.