Abstract
This paper reports on the effect which the particle concentration and colloidal stabilization of magnetic fluids has on the width of the absorption line of the fluids at resonance. Both theoretical considerations and experimental results demonstrate that in zero polarizing fields, for the same type of magnetic fluids and the same particle concentration, the width of absorption line at resonance, Δf, is larger for magnetic fluids in which particle agglomerations occur than in magnetic fluids in which no particle agglomerations are present. It is also demonstrated that for magnetic fluids having good colloidal stability in zero polarizing field, Δf depends linearly on particle concentration. By means of a comparison between data obtained from magnetic resonance measurements (from complex susceptibility measurements over the frequency range, 100MHz–6GHz) and results obtained by magneto–optical measurements, a good agreement regarding the colloidal stability was obtained. Measurements are presented for different magnetic fluid samples, having different degrees of colloidal stabilisation.
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