Spin-glass-like ordering of the magnetic moments of interacting nanosized maghemite particles

Steen Mørup, Franz Bødker, Peter Vang Hendriksen, Søren Linderoth

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Samples of interacting nanosized maghemite particles have been studied by Mössbauer spectroscopy and magnetization measurements. The apparent blocking temperatures obtained from Mössbauer spectroscopy and zero-field-cooled magnetization curves are nearly identical, but the values obtained from measurements of the decay of remanence are much lower. These results are not in accordance with the Néel model for superparamagnetic relaxation, but can be explained by the formation of an ordered spin-glass-like state at low temperatures. At a critical temperature a transition to a superparamagnetic state takes place. By varying the average interparticle distance it is possible to change the ordering temperature.
Original languageEnglish
JournalPhysical Review B
Issue number1
Pages (from-to)287-294
Publication statusPublished - 1995

Bibliographical note

Copyright (1995) by the American Physical Society.


  • Relaxation
  • Superparamagnetic model
  • Random anisotropy
  • Dipole interactions
  • Susceptibility phenomena
  • System
  • Mossbauer-spectroscopy
  • Alpha-Fe
  • Size
  • Field-depemdence

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