Hostname: page-component-78c5997874-dh8gc Total loading time: 0 Render date: 2024-11-20T00:25:53.695Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

[1] Barnard, J.A., Waknis, A., Tan, M., Haftek, E., Parker, M.R., and Watson, M.L., J. Mag. Mag. Mat. 114, 203 (1992).Google Scholar
[2] Barnard, J.A., Hossain, S., Parker, M.R., Waknis, A., and Watson, M.L., J. Appl. Phys., in press.Google Scholar
[3] Watson, M.L., Barnard, J.A., Hossain, S., and Parker, M.R., J. Appl. Phys., in press.Google Scholar
[4] Berkowitz, A.E., Mitchell, J.R., Carey, M.J., Young, A.P., Zhang, S., Spada, F.E., Parker, F.T., Hutten, A., and Thomas, G., Phys. Rev. Lett. 68, 3745 (1992).Google Scholar
[5] Xiao, J.Q., Jiang, J.S., and Chien, C.L., Phys. Rev. Lett. 68, 3749 (1992).Google Scholar
[6] Jiang, J.S., Xiao, J.Q., and Chien, C.L., Appl. Phys. Lett. 61, 2362 (1992).Google Scholar
[7] Parker, M.R., Barnard, J.A., Seale, D., and Waknis, A., J. Appl. Phys., in press.Google Scholar
[8] Gittleman, J.L., Goldstein, Y., and Bozowski, S., Phys. Rev. B 5, 3609 (1972).Google Scholar
[9] Parker, M.R., National Storage Industry Consortium Report: Advanced Technology Program, 1993.Google Scholar
[10] Parker, M.R., Proc. 13th Intl. Colloquium on Magnetic Films and Surfaces, Glasgow, p. 119, (Aug. 1991).Google Scholar