Surface effects in metallic iron nanoparticles

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Abstract

Nanoparticles of metallic iron on carbon supports have been studied in situ by use of Mossbauer spectroscopy. The magnetic anisotropy energy constant increases with decreasing particle size, presumably because of the influence of surface anisotropy. Chemisorption of oxygen results in formation of a surface layer with magnetic hyperfine fields similar to those of thicker passivation layers, and with a ferromagnetic coupling to the spins in the core of the particles. In contrast, thicker passivation layers have a noncollinear spin structure.
Original languageEnglish
JournalPhysical Review Letters
Volume72
Issue number2
Pages (from-to)282-285
ISSN0031-9007
DOIs
Publication statusPublished - 1994

Bibliographical note

Copyright (1994) by the American Physical Society.

Keywords

  • LAYER
  • FE(001)
  • FE PARTICLES
  • MICROCRYSTALS
  • EXTERNAL MAGNETIC-FIELDS
  • MOSSBAUER

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