Superparamagnetic behavior of structural domains in epitaxial ultrathin magnetite films

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

doi:10.1103/PhysRevB.57.R8107

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 journal › Article › Academic › peer-review

212 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 language	English
Pages (from-to)	R8107-R8110
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	57
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.57.R8107
Publication status	Published - 1 Jan 1998
Externally published	Yes

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AU - Palstra, T.

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AU - James, M.

AU - Hibma, T.

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AB - 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.

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Superparamagnetic behavior of structural domains in epitaxial ultrathin magnetite films

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