The origin of the non-monotonic field dependence of the blocking temperature in magnetic nanoparticles

R. K. Zheng*, Hongwei Gu, Bing Xu, Xixiang Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

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 3kOe; 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.

Original languageEnglish (US)
Article number010
Pages (from-to)5905-5910
Number of pages6
JournalJournal of Physics Condensed Matter
Volume18
Issue number26
DOIs
StatePublished - Jul 5 2006

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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