INVESTIGATING THE PROPERTIES OF MAGNETIC FLUIDS BY MEANS OF POLARISED MEASUREMENTS
Pages 14-23
P.C. Fannin
Abstract
Field and frequency-dependent, complex susceptibility, c(w, H)=c' (w, H)?i?c''? (H, w), measurements is a well
established method for investigating the dynamic properties of magnetic fluids. Polarised measurements have
been used to investigate many properties, including, relaxation mechanisms, the presence or absence of
aggregates, and associated magnetic losses. Also, important information on the effect which polarised
measurements have on on the hysteresis and isotropic properties of samples can also be obtained through the
use of polarised measurements.In this paper examples of the determination of the above mentioned properties
on two magnetic fluid samples, by means of the toroidal technique over the frequency range 200 Hz to 1 MHz,
are presented and discussed.