ON THE FREQUENCY AND MAGNETIC POLARIZING FIELD DEPENDENCE OF
THE COMPLEX DIELECTRIC PERMITTIVITY OF MAGNETIC FLUIDS IN THE
MICROWAVE RANGE
Pages 93-96
P. C. Fannin, I. Malaescu, N. Stefu, C. N. Marin
Abstract
This paper reports on the frequency dependence of the complex dielectric permittivity for a kerosenebased
magnetic fluid, with magnetite particles, in the microwave frequency range (0.3 to 3 GHz), at
various values of an external polarizing magnetic field (0 to 168 kA/m). The results obtained allow the
determination of the field dependence of the activation energy corresponding to the Maxwell-Garnett-Sillars dielectric relaxation process. Changes of the activation energy by increasing the polarizing field suggest changes in the local structure of the magnetic fluid.