THE FIELD RATE DEPENDENCE OF COERCIVITY IN FINE-PARTICLE FERROMAGNETSAND THE APPLICABILITY OF THE CRITICAL VOLUME APPROACH

Authors
FARRANT SH CREW DC STREET R
Citation
Sh. Farrant et al., THE FIELD RATE DEPENDENCE OF COERCIVITY IN FINE-PARTICLE FERROMAGNETSAND THE APPLICABILITY OF THE CRITICAL VOLUME APPROACH, IEEE transactions on magnetics, 32(5), 1996, pp. 4225-4227
Citations number
7
Categorie Soggetti
Engineering, Eletrical & Electronic","Physics, Applied
Journal title
IEEE transactions on magnetics → ACNP
ISSN journal
00189464
Volume
32
Issue
5
Year of publication
1996
Part
1
Pages
4225 - 4227
Database
ISI
SICI code
0018-9464(1996)32:5<4225:TFRDOC>2.0.ZU;2-F
Abstract
A thermally activated Stoner Wohlfarth model is used to calculate coer civity as a function of field rate for systems in which a distribution of particle volumes and easy axis orientations is possible. The analy tical treatment of M. El-Hilo, A. M. de Witte, K. O'Grady and R. W. Ch antrell [J. Magn. Magn. Mater., vol. 117, pp. L307-L310, 1992] which w as based on a critical volume assumption is found to be in excellent a greement with the model calculations for aligned systems with a distri bution of particle volumes. The limitations of any analytical theory a re shown when a distribution of orientations is included.