Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 18, Issue 26, Pages 5905-5910Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/18/26/010
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The dependence of the peak temperature (TP) of the zero-field-cooled (ZFC) magnetization curves on the field in a magnetic nanoparticle system was studied using a diluted magnetic fluid composed of FePt nanoparticles. We found that the peak temperature increases with increasing applied field below 3 kOe; it then decreases when the applied field is increased further. We attribute the non-monotonic field dependence of the peak temperature to the anisotropic energy barrier distribution of the particles and to the slow decrease of high-field magnetization above the blocking temperature. Numerical simulations, based on magnetic dynamics, agree well with our experimental results.
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