Browse Prior Art Database

Self Biased Noise Free Magnetoresistive Head

IP.com Disclosure Number: IPCOM000082408D
Original Publication Date: 1974-Dec-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Cheatham, SD: AUTHOR [+2]

Abstract

A batch fabricated shielded magnetoresistive (MR) head with a single off-center MR layer utilizes a sense current through a nonmagnetoresistive resistive (R) layer, for both MR layer biasing and noise cancellation.

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Self Biased Noise Free Magnetoresistive Head

A batch fabricated shielded magnetoresistive (MR) head with a single off- center MR layer utilizes a sense current through a nonmagnetoresistive resistive
(R) layer, for both MR layer biasing and noise cancellation.

When sense current I(s) flows through the head to ground, information recorded on the media as magnetic manifestations will be represented as electrical signals at the differential amplifier output. An additional layer R having a resistance-approximately equal to the resistance of the MR layer and placed parallel to the MR layer, permits cancellation of thermal noise spikes, occurring in the head, by common-mode rejection.

For an R layer, which is not magnetoresistive, the MR layer can be biased by the portion of the current I(s) through the R layer, if the MR layer is placed off- center between shields and the R layer is placed between the MR layer and the nearer shield. The shields may be made of any high-permeability material. The R layer may be placed directly on a ferrite shield without any intervening insulation. Otherwise, insulation, as shown, is required.

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