Fluctuations of the magnetic moment direction of single Fe3O4nanoparticles were measured by conductive atomic force microscopy. Superparamagnetic nanoparticles were deposited on an Fe-Pt thin film, and the current through the film and individual particles was detected as a function of time. Due to magnetoresistance in the particle-film system, changes in the particle moment direction lead to different current levels. The effect of magnetic fields between -69 and 153 Oe on the characteristic current levels was used to determine the effective anisotropy of the particle. Magnetoresistance values of 45% were observed.
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Piotrowski et al. (2014) studied this question.
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