Equilibrium magnetization of dipolar interacting ferrofluids.

B. Huke - M. Luke

Institut für Theoretische Physik,Universität des Saarlandes, D-66041 Saarbrücken, Germany

Abstract
For ferrofluids that are described by a system of hard spheres interacting via dipolar forces we evaluate the magnetization as a function of the internal magnetic field with a Born--Mayer technique and an expansion in the dipolar coupling strength. Two different approximations are presented for the magnetization considering different contributions to a series expansion in terms of the volume fraction of the particles and the dipolar coupling strength. Figs 4, Refs 17.