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Bias Method for Magnetoresistive Sensor

IP.com Disclosure Number: IPCOM000039333D
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Nix, JL: AUTHOR [+2]

Abstract

The application of a magnetic bias intermittently to a magnetoresistive (MR) sensing element in addition to the regular bias for operation of the MR element reduces the distortion in the output signal. The write conductor of an inductive write/MR read head can be used to provide this intermittent bias. Bandpass filters can be used to sense the second harmonic of the servo signal to produce an appropriate amount of bias to stabilize the MR element. The MR sensor can become unstable due to dynamic magnetic domain arrangement with a high level output signal from the media. A longitudinal magnetic bias field applied to the MR element lessens the domain activity and linearizes the transfer characteristic curve. The write conductor can be selectively activated during a read cycle to provide the stabilizing magnetic bias.

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Bias Method for Magnetoresistive Sensor

The application of a magnetic bias intermittently to a magnetoresistive (MR) sensing element in addition to the regular bias for operation of the MR element reduces the distortion in the output signal. The write conductor of an inductive write/MR read head can be used to provide this intermittent bias. Bandpass filters can be used to sense the second harmonic of the servo signal to produce an appropriate amount of bias to stabilize the MR element. The MR sensor can become unstable due to dynamic magnetic domain arrangement with a high level output signal from the media. A longitudinal magnetic bias field applied to the MR element lessens the domain activity and linearizes the transfer characteristic curve. The write conductor can be selectively activated during a read cycle to provide the stabilizing magnetic bias. The amount of current necessary to activate the bias is much less than that required for a write operation.

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