Browse Prior Art Database

Skin Effect Magnetoresistive Devices

IP.com Disclosure Number: IPCOM000085321D
Original Publication Date: 1976-Mar-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Horne, DL: AUTHOR [+3]

Abstract

Magnetoresistive devices which measure and utilize the skin depth magneto-resistive effect are described. These devices require (1) an AC current, (2) that the cross-sectional diameter of the sample must be greater than the skin depth, and (3) the sample must be sensitive to the applied magnetic field.

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Skin Effect Magnetoresistive Devices

Magnetoresistive devices which measure and utilize the skin depth magneto- resistive effect are described. These devices require (1) an AC current, (2) that the cross-sectional diameter of the sample must be greater than the skin depth, and (3) the sample must be sensitive to the applied magnetic field.

A specific embodiment is shown in the figure.

This magnetoresistive device reads information recorded on a magnetic credit card. The information is in the form of magnetic transitions on magnetic stripes on the credit card. The device senses the information by demodulating the AC voltage drop across a high-permeability electrical conductor. The conductor, such as a permalloy material, has a thickness which is more than several times greater than the zero-field skin depth at the sense current frequency, Omega.

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