On the models for interparticle interactions in nanoparticle assemblies: comparison with experimental results

  • Dormann J
  • Fiorani D
  • Tronc E
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The models proposed to account for the variation of the blocking temperature of a magnetic particle in an assembly of interacting particles are re-discussed. Experimental results on the thermal variation of the relaxation time are reported in support of the discussion. Except few cases related to a collective state, all data are well explained by the Dormann-Bessais-Fiorani model accounting for the interparticle interactions, in the framework of the superparamagnetic Neel-Brown model. The energy barrier unambiguously increases with increasing interactions, even when they are very weak, in disagreement with the Morup-Tronc model.

Author-supplied keywords

  • dipolar interactions
  • fine particles
  • magnetic ordering
  • superparamagnetism

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  • J.L L Dormann

  • D. Fiorani

  • E. Tronc

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