Preamplifier bias mode to re-initialize a GMR head after losing

Details Preamplifier bias mode to re-initialize a GMR head after losing Preamplifier bias mode to re-initialize a GMR head after losing

1997-11-14

1999-10-19

Patidar, Jay

Electricity: measuring and testing

Magnetic

Magnetometers

360113, 360 66, G11B 539, G11B 503, G01R 3302

Patent

active

059695234

ABSTRACT:
A method and apparatus for re-initializing a GMR head after losing initialization is disclosed. The invention may use a voltage controlled waveform, which allows the current to vary with the resistance of the GMR head. Furthermore, according to a further aspect of the invention a stack of GMR heads may be reinitialized having the same orientation to preclude inversion of the reset magnetic fields on half of the heads. In addition, improvements in re-initializing GMR heads is provided by implementing wave shaping. The invention can also provide re-initialization of GMR heads at different points in the manufacturing process.

REFERENCES:
patent: 5159513 (1992-10-01), Dieny et al.
patent: 5206590 (1993-04-01), Dieny et al.
patent: 5650887 (1997-07-01), Dovek et al.

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