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On the influence of cyclic polarising fields on the properties of magnetic fluids

P. C. FANNIN1,* , C. MAC OIREACHTAIGH1

Affiliation

  1. Department of Electronic and Electrical Engineering, Trinity College, Dublin 2, Ireland

Abstract

Measurement of the frequency dependent, complex susceptibility, χ(ω = χ∋(ω)−ιχ∋∋(ω), of magnetic fluids, by means of the toroidal technique, is a well established technique for investigating the dynamic properties of magnetic fluids, under the influence of an external polarising field, H. Here we show how data obtained from such polarised measurements, in conjunction with the Weierstrass hypothesis, can be used to determine the isotropic properties of a magnetic fluid sample. The Weierstrass hypothesis dictates that, for the fluid to be isotropic, a plot of χ(ω,H) vs H should be symmetrical about the vertical axis. Here we demonstrate this to be so for a colloidal suspension of magnetite in water..

Keywords

Magnetic fluids, Complex susceptibility, Cyclic polarizing fields.

Submitted at: Dec. 26, 2006
Accepted at: Sept. 18, 2007

Citation

P. C. FANNIN, C. MAC OIREACHTAIGH, On the influence of cyclic polarising fields on the properties of magnetic fluids, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 9, pp. 2891-2896 (2007)