Title :
The field rate dependence of coercivity in fine particle ferromagnets and the applicability of the critical volume approach
Author :
Farrant, S.H. ; Crew, D.C. ; Street, R.
Author_Institution :
Western Australia Univ., Nedlands, WA, Australia
fDate :
9/1/1996 12:00:00 AM
Abstract :
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
Keywords :
coercive force; ferromagnetism; integration; magnetic anisotropy; magnetic particles; aligned systems; coercivity; critical volume approach; easy axis orientation distribution; effective anisotropy field; field rate dependence; fine particle ferromagnets; numerical integration; numerical simulation; particle volume distribution; thermally activated Stoner Wohlfarth model; Anisotropic magnetoresistance; Australia; Coercive force; Equations; Magnetic analysis; Magnetic recording; Numerical models; Numerical simulation; Saturation magnetization; Writing;
Journal_Title :
Magnetics, IEEE Transactions on
