Magnetization dynamics from kinetic theory of ferromagnetic units in dilute suspension

P. Ilg¹ - M. Kröger^1,2 - S. Hess¹

¹ Institut für Theoretische Physik, TU Berlin, 10623 Berlin, Germany
² Polymerphysik, Institut für Polymere, ETH Zürich, 8092 Zürich, Schweiz

Abstract
The derivation of the magnetization dynamics from a kinetic model of a dilute suspension of ferromagnetic ellipsoidal units is presented. The derivation is based on the effective field approximation, where canonical distribution functions are used in order to obtain closed equations for the macroscopic variables. The range of validity and efficiency of the dynamical equation for the magnetization is estimated by comparison with Brownian dynamics simulations of the underlying kinetic model for several flow conditions. Comparisons with recent experimental results are made. Figs 3, Refs 15.