Method and apparatus for controlling magnetoresistive effect ele

Details Method and apparatus for controlling magnetoresistive effect ele Method and apparatus for controlling magnetoresistive effect ele

1995-03-02

1997-02-25

Kim, W. C.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360113, 360 66, 360 7701, G11B 503, G11B 558, G11B 5596, G11B 5127

Patent

active

056064705

ABSTRACT:
When a magnetic recording and reproducing apparatus is in a waiting state, feedback control for positioning the carriage is released, and a supply of a sense current to the magnetoresistive effect element of the MR magnetic head is adjusted so as to prolong the life of the MR magnetic head. When the interface and control circuit recognizes that there is no order from the host computer and that the magnetic recording and reproducing apparatus is in a wait state, the servo control circuit releases the feedback control for positioning the head. A mode, etc. selection control circuit controls the recording/reproduction amplifier so as not to supply a sense current to the magnetoresistive effect element of the MR magnetic head. Accordingly, the time for supplying a sense current to the magnetoresistive effect element of the MR magnetic head is reduced in a great measure and, therefore, it is possible to prevent the deterioration of the element characteristics by electro-migration or the like. The result is that the life of the element can be prolonged. Hence, the output of the MR magnetic head can be increased without sacrificing the reliability. Accordingly, it has become possible to improve the performance of a high-output magnetic recording and reproducing apparatus using an MR magnetic head.

REFERENCES:
patent: 5345347 (1994-09-01), Hopkins et al.
patent: 5381279 (1995-01-01), Dunn
patent: 5408369 (1995-04-01), Miura et al.
patent: 5465183 (1995-11-01), Hattori

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