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Temperature oscillations of magnetization observed in nanofluid ferromagnetic graphite
S Sergeenkov1, N S Souza, C Speglich
1Materials and Devices Group, Department of Physics and Physical Engineering, Universidade Federal de São Carlos, São Carlos, SP 13565-905, Brazil.
Abstract:
We report on unusual magnetic properties observed for nanofluid room temperature ferromagnetic graphite (with an average particle size of [Formula: see text] nm). More precisely, the measured magnetization exhibits a low temperature anomaly (attributed to the manifestation of finite size effects below the quantum temperature [Formula: see text]) as well as pronounced temperature oscillations above T = 50 K (attributed to manifestation of the hard-sphere type of pair correlations between ferromagnetic particles in the nanofluid).
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