Eur. Phys. J. B 50, 581-585 (2006)
https://doi.org/10.1140/epjb/e2006-00174-1

Physical properties of magnetic grains dispersed in anisotropic media

¹ Departamento de Física, Universidade do Estado do Rio Grande do Norte, 59600-900 Mossoró -, RN, Brazil
² Departamento de Física Teórica e Experimental, Universidade Federal do Rio Grande do Norte, 59078-970 Natal, RN, Brazil
³ Departamento de Física, Universidade Federal do Ceará, 60455-760 Fortaleza, Ce, Brazil

Corresponding author: ^a nalmeida@fisica.ufc.br

Received: 6 October 2005
Revised: 20 February 2006
Published online: 17 May 2006

Abstract

We calculate the dynamical response of a group of non-interacting magnetic grains dispersed in a medium that imposes on them an uniaxial anisotropy. Numerical results are obtained for a collection of grains that has its volume distribution given by a Gaussian function centered in the average volume V₀, and has a width σV₀. We assume that the only effect of the medium on the particles is the anisotropy imposed on the grains to study the influence of the volume distribution (σ and V₀) on the effective permeability. The results are analyzed through the calculation of numerical values for the components of the magnetic permeability and also by the analysis of the combined effect of the external dc magnetic field and the width of the volume distribution on the skin depth.