Abstract
The authors report on the measurement, over the frequency range 10 Hz to 3 GHz, of the complex susceptibility, chi ( omega )= chi '( omega )-i chi "( omega ), of a magnetic fluid with manganese ferrite particles of median diameter 9.4 nm in a hydrocarbon carrier. This upper frequency was realized by use of a HP Network Analyser which operates over the frequency range 300 kHz to 3 GHz and has enabled a more complete susceptibility-frequency profile to be determined. The presence of a loss-peak at 30 MHz in the chi "( omega ) component is a demonstration of the phenomenon of superparamagnetism in small ferromagnetic particles whilst the transition of chi '( omega ) to a negative value at 65 MHz is indicative of ferroresonance.
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