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ac susceptibility of cobalt in mercury magnetic fluids

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4 Author(s)
Abu‐Aljarayesh, I. ; Physics Department, Yarmouk University, Irbid, Jordan ; Bayrakdar, A. ; Yusuf, N.A. ; Abu‐Safia, H.

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The temperature dependence of the frequency‐dependent magnetic susceptibility χ’ has been measured for tin‐coated cobalt particles dispersed in mercury, in the temperature range 80–290 K and for a driving frequency of 10 kHz. A rounded maximum in χ’ was observed at certain temperature below the melting point of the mercury Tm. For T≳Tm, a rapid increase of χ’ with temperature is observed. This maximum disappeared for the heat‐treated sample. The results show that χ’(T) follows a Curie–Weiss behavior for TB≪T≪Tm, with positive ordering temperatures for the three samples. The results were analyzed within the context of Neel theory of superparamagnetism.

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Journal of Applied Physics  (Volume:73 ,  Issue: 10 )