Disk drive with a thermal asperity reduction circuitry using a m

Details Disk drive with a thermal asperity reduction circuitry using a m Disk drive with a thermal asperity reduction circuitry using a m

1997-06-05

1998-08-11

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Head

Hall effect

G11B 539

Patent

active

057935769

ABSTRACT:
A disk drive system having a magnetoresistive (MR) sensor having four leads, two leads for providing sense current to an MR layer and two leads for providing current to a soft adjacent layer (SAL). The MR layer as well as the hard bias layers are electrically insulated from the SAL by an insulator. The voltages developed across the MR layer (voltages due to the presence of thermal asperities and voltages due to the presence of data fields) and the SAL (voltages due to the presence of thermal asperities) are applied to the inputs of a differential amplifier for substantial elimination of the thermal asperity signal.

REFERENCES:
patent: 5233482 (1993-08-01), Galbraith et al.
patent: 5420736 (1995-05-01), Heim et al.
patent: 5452163 (1995-09-01), Coffey et al.
patent: 5556718 (1996-09-01), Motomura et al.

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