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Modeling Giant Magnetoresistance and Relative Permeability in Granular Films

Published online by Cambridge University Press:  03 September 2012

M.R. Parker ,
J.A. Barnard ,
S. Hossain ,
D. Seale ,
M. Tan  and
A. Waknis
M.R. Parker
Affiliation:
The University of Alabama, Department of Electrical Engineering
J.A. Barnard
Affiliation:
The University of Alabama, Department of metallurgical and Materials Engineering Tuscaloosa, AL 35487–0202
S. Hossain
Affiliation:
The University of Alabama, Department of Electrical Engineering
D. Seale
Affiliation:
The University of Alabama, Department of Electrical Engineering
M. Tan
Affiliation:
The University of Alabama, Department of metallurgical and Materials Engineering Tuscaloosa, AL 35487–0202
A. Waknis
Affiliation:
The University of Alabama, Department of metallurgical and Materials Engineering Tuscaloosa, AL 35487–0202
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Abstract

A Model for the field dependence of giant Magnetoresistance (GMR) in ‘granular’ co-sputtered alloy thin films (based on a relatively simple spin-dependent scattering concept appropriate to superparamagnetic and weakly ferromagnetic films) is applied to new experimental data from the Co90Fe10-Ag system. The Model and the experimental data can be shown to compare very well with the help of a single adjustable parameter related to spin correlation of adjacent Co-Fe clusters. A careful fit of field-dependent MR data and theory leads to a fairly reliable determination of spin-cluster radius. An analysis of the relative permeability of granular GMR films derived from the generalized form of the Clausius-Mossoti relationship is also presented. For a non-Magnetic Matrix the effective relative permeability is shown to be materials independent. The permeability model is applied to Co-Au granular films.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 313: Symposium Q1 – Magnetic Ultrathin Films, Multilayers and Surfaces/Magnetic Interfaces-Physics and Characterizations , 1993 , 73
Copyright
Copyright © Materials Research Society 1993

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References

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