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The field rate dependence of coercivity in fine particle ferromagnets and the applicability of the critical volume approach

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3 Author(s)
Farrant, S.H. ; Western Australia Univ., Nedlands, WA, Australia ; Crew, D.C. ; Street, R.

A thermally activated Stoner Wohlfarth model is used to calculate coercivity as a function of field rate for systems in which a distribution of particle volumes and easy axis orientations is possible. The analytical treatment of M. El-Hilo, A.M. de Witte, K. O'Grady and R.W. Chantrell [J. Magn. Magn. Mater., vol. 117, pp, L307-L310, 1992], which was based on a critical volume assumption, is found to be in excellent agreement with the model calculations for aligned systems with a distribution of particle volumes. The limitations of analytical theory are shown when a distribution of orientations is included

Published in:

Magnetics, IEEE Transactions on  (Volume:32 ,  Issue: 5 )

Date of Publication:

Sep 1996

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