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On the bulk averaging approach for obtaining the effective parameters of thin magnetic granular films

Published online by Cambridge University Press:  15 January 2002

C. R. Simovski  and
B. Sauviac
C. R. Simovski
Affiliation:
Department of Physics, State Institute of Fine Mechanics and Optics, 197101 St-Petersburg, Russia
B. Sauviac*
Affiliation:
DIOM Laboratory (Devices and Instrumentation for Optoelectronics and Microwaves), ISTASE, Université Jean Monnet, 42023 St-Etienne, Cedex, France
*
bruno.sauviac@univ-st-etienne.fr
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Abstract

An analytical model for the effectivemagnetic properties of a thin film consisting of a few layers of particles with arbitrary permeability and thestochastical initial magnetizationis presented. The model is magnetostatic and implies the explicit averaging of the true field. It is shown thatit works for all possible thicknesses of the film (arbitrary number of particlesacross the film) and there is no need forsurface-to-bulk transition. The surface effect leading to the change of the reflective propertiesof the thin film compared to the prediction of the traditional theoryis significant for a sparse arrangement of the grainsand vanishes when these are touching. The method is verified by comparisonwith the model of the lattice of magnetic scattering centers.

Keywords

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Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 17 , Issue 1 , January 2002 , pp. 11 - 20
Copyright
© EDP Sciences, 2002

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