Method and apparatus for adjusting a bias current of a magneto-r

Details Method and apparatus for adjusting a bias current of a magneto-r Method and apparatus for adjusting a bias current of a magneto-r

1997-07-16

2000-05-23

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

G11B 503

Patent

active

060672005

ABSTRACT:
A method is provided to adjust a bias current flowing through a magneto-resistive effect type magnetic head. An examining current is supplied to the magneto-resistive effect type magnetic head, and a voltage applied to a pair of terminals of the magneto-resistive effect type magnetic head is measured. In addition, a resistance of the magneto-resistive effect type magnetic head is calculated according to the examining current and the voltage, and an allowable range of the bias current flowing through the magneto-resistive effect type magnetic head is determined according to a relationship between a life time of the magneto-resistive effect type magnetic head examined in advance and the resistance of the magneto-resistive effect type magnetic head. An optimum bias current is determined within the allowable range in condition that a slice level margin is maximized.

REFERENCES:
patent: 5774291 (1998-06-01), Contreras
patent: 5790334 (1998-08-01), Cunningham
patent: 5825570 (1998-10-01), Kanegae et al.

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