Influence of magnetic anisotropy constant and particle domain magnetization on magneto-dielectric response of substituted manganese ferrite particlesdispersed in kerosene

This paper presents a dielectric and magneto-dielectric study of magnetic f luids made of three different, partially substituted, manganese ferrite par ticles dispersed in kerosene. Measurements were performed using a wholly au tomated spectrometer in the frequency range 1 mHz-10 MHz and a temperature range from -200 degreesC up to 100 degreesC. We can distinguish the two pha ses (solid and liquid) in pure kerosene and three phases for all the magnet ic fluid samples. We observed the effect of anisotropy constant and domain magnetization of the particles on magneto-dielectric measurements. We also observed the temperature sensitivity of these fluids. (C) 2001 Elsevier Sci ence B.V. All rights reserved.