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Preparation and characterization of epitaxial iron oxide films

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Abstract

Well-ordered, pure-phase epitaxial films of FeO, Fe3O4, and γ–Fe2O3 were prepared on MgO(001) by oxygen-plasma-assisted MBE. The stoichiometries of these thin films were controlled by varying the growth rate and oxygen partial pressure. Selective growth of γ–Fe2O3 and α–Fe2O3 was achieved by controlling the growth conditions in conjunction with the choice of appropriate substrates. Growth of the iron oxide epitaxial films on MgO at ≥350 °C is accompanied by significant Mg outdiffusion. The FeO(001) film surface exhibits a (2 × 2) reconstruction, which is accompanied by a significant amount of Fe3+ in the surface region. Fe3O4 (001) has been found to reconstruct to a structure. γ–Fe23 (001) film surface is unreconstructed.

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Authors and Affiliations

  1. Pacific Northwest National Laboratory, P.O. Box 999, MS K8-93, Richland, 99352, Washington, USA

    Y. Gao, Y. J. Kim & S. A. Chambers

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  1. Y. Gao
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  2. Y. J. Kim
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  3. S. A. Chambers
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Gao, Y., Kim, Y.J. & Chambers, S.A. Preparation and characterization of epitaxial iron oxide films. Journal of Materials Research 13, 2003–2014 (1998). https://doi.org/10.1557/JMR.1998.0281

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