Abstract
The kerosene-based ferrofluid RP-90 has been examined by electron paramagnetic resonance (EPR) from room temperature to liquid nitrogen temperature at the X-band frequency 9.41 GHz. The variations in the g-value and ( ΔH) with temperature indicate the presence of a magnetic phase transition from a ferromagnetic to a ‘spin glass or cluster glass’ state. This transition is associated with the freezing point of the carrier medium. No evidence of the presence of superparamagnetism was observed. The linewidth variation with temperature indicates a dominant bulk rotation relaxation mechanism ( τ B).
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