Magnetoresistive head with minimal electromigration

Details Magnetoresistive head with minimal electromigration Magnetoresistive head with minimal electromigration

1998-07-08

2000-12-19

Kim, W. Chris

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

360313, G11B 503

Patent

active

061634263

ABSTRACT:
A magnetoresistive head achieves maximum signal output with minimal electromigration by using a magnetoresistive element through which a unidirectional sense current is flown. Periodically, a control circuit determines whether one or more switching criteria have been met, and applies a counter-directional compensation current in the magnetoresistive element when the switching criteria are met, thus suppressing electromigration in the magnetoresistive element in the direction of said sense current. In a preferred embodiment, the compensation current is applied during a quiescence period. In another embodiment a continuous unidirectional sense current is flown through the magnetoresistive element, and the control circuit suspends the sense current in the magnetoresistive element for a period of time when one or more switching criteria have been met, so as to prevent atomic excursion beyond one atomic diameter, such that electromigration in the magnetoresistive element is substantially reduced in the direction of the sense current.

REFERENCES:
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patent: 5572379 (1996-11-01), Aoi et al.
patent: 5606470 (1997-02-01), Shioya et al.
patent: 5615063 (1997-03-01), Kuroki et al.
patent: 5719729 (1998-02-01), Koyama et al.

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