Antiphase boundaries induced exchange coupling in epitaxial Fe 3O 4 thin films

S. K. Arora, R. G S Sofin, A. Nolan, I. V. Shvets

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39 Citations (Scopus)

Abstract

We have observed an exchange bias effect on field cooling of epitaxial magnetite, Fe 3O 4, films on MgO (1 0 0) substrates. We attribute this effect to the presence of antiphase boundaries (APBs). Magnitude of the exchange bias field (H e) strongly depends on the thermo-magnetic history of the sample. The strength of the H e was found to increase with an increase in film thickness and is attributed to the strain driven redistribution of atoms in the vicinity of APBs leading to enhanced antiferromagnetic exchange interactions.

Original languageEnglish
Pages (from-to)463-467
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume286
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - Feb 2005

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Keywords

  • Exchange bias
  • Grain boundaries
  • Magnetite
  • Thin epitaxial films

ASJC Scopus subject areas

  • Condensed Matter Physics

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