Method and apparatus for biasing a magneto-resistive head

Details Method and apparatus for biasing a magneto-resistive head Method and apparatus for biasing a magneto-resistive head

1992-10-08

1994-05-03

Hajec, Donald

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

360 46, 360 67, G11B 503, G11B 509, G11B 502

Patent

active

053092953

ABSTRACT:
A method and apparatus are provided for biasing a non-center tapped magneto-resistive head at a constant voltage using two separate biasing stages to provide independent control over the voltage at each of the two terminals of the head. A first control device detects the voltage at a first head terminal and directs changes to the output of a current source, interconnected with a first terminal of the head, to maintain the voltage at the first terminal at a first predetermined voltage. A second control device detects the voltage at second terminal of the head and directs changes to the input of a current sink, interconnected with the second terminal, to maintain the voltage at the second terminal at a second predetermined voltage. Each control device is interconnected to a separate reference voltage source; by appropriate selection of the voltages of the reference voltage sources, the voltages at the two head terminals and the potential across the head can be established and maintained.

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IBM Tech. Discl. Bulletin, Apr. 1984 "Improved Method for Brasing a Magnetoresistive Element", Baily & Ramirez, vol. 26, No. 11, p. 5915.

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