Spin rotation in alpha-Fe2O3 nanoparticles by interparticle interactions

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Abstract

Nanoparticles of alpha-Fe2O3 (hematite) typically have the sublattice magnetization directions in the hexagonal (001) plane below the Neel temperature. By use of Mossbauer spectroscopy we have found that for agglomerated particles the sublattice magnetization may be rotated of the order of 15degrees out of plane, depending on the particle size. The spin rotation can be explained by exchange interaction between neighboring particles with nonparallel (001) planes. The results imply that interparticle interactions can lead to spin directions deviating from the easy axis defined by the magnetic anisotropy.
Original languageEnglish
JournalPhysical Review Letters
Volume94
Issue number2
Pages (from-to)027202
ISSN0031-9007
DOIs
Publication statusPublished - 2005

Bibliographical note

Copyright 2005 American Physical Society

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