Thermoinduced magnetization in nanoparticles of antiferromagnetic materials

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Abstract

We show that there is a thermoinduced contribution to the magnetic moment of nanoparticles of antiferromagnetic materials. It arises from thermal excitations of the uniform spin-precession mode, and it has the unusual property that its magnitude increases with increasing temperature. This has the consequence that antiferromagnetism is nonexistent in nanoparticles at finite temperatures and it explains magnetic anomalies, which recently have been reported in a number of studies of nanoparticles of antiferromagnetic materials.
Original languageEnglish
JournalPhysical Review Letters
Volume92
Issue number21
Pages (from-to)217201
ISSN0031-9007
DOIs
Publication statusPublished - 2004

Bibliographical note

Copyright (2004) American Physical Society.

Keywords

  • OXIDE
  • ANOMALIES
  • FINS
  • SPIN
  • NEUTRON-SCATTERING
  • DYNAMICS
  • MOSSBAUER
  • FERRITIN
  • NIO NANOPARTICLES

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