Superparamagnetic behavior of structural domains in epitaxial ultrathin magnetite films

F. Voogt, T. Palstra, L. Niesen, O. Rogojanu, M. James, T. Hibma

Research output: Contribution to journalArticleAcademicpeer-review

200 Citations (Scopus)

Abstract

We provide evidence that thin films of magnetite (Formula presented) epitaxially grown on single-crystalline MgO(100), form domains with unique magnetic properties. Strong 180° Fe-O-Fe superexchange paths at antiphase domain boundaries result in a frustration of the interdomain interactions. Probe-layer Mössbauer spectroscopy shows superparamagnetic behavior in the entire film, in spite of the nearly perfect layer-by-layer growth. Superconducting quantum interference device magnetometry is used to determine the temperature and thickness dependence of the superparamagnetic blocking temperatures.

Original languageEnglish
Pages (from-to)R8107-R8110
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume57
Issue number14
DOIs
Publication statusPublished - 1 Jan 1998
Externally publishedYes

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