Layer-by-layer epitaxial growth of polar FeO(111) thin films on MgO(111)

Details Layer-by-layer epitaxial growth of polar FeO(111) thin films on MgO(111) Layer-by-layer epitaxial growth of polar FeO(111) thin films on MgO(111)

2011-11-14

arxiv.org/abs/1111.3161v1

Physics

Condensed Matter

Materials Science

12 pages, 5 figures

Scientific paper

We report on the structural properties of epitaxial FeO layers grown by molecular beam epitaxy on MgO(111). The successful stabilization of polar FeO films as thick as 16 monolayers (ML), obtained by deposition and subsequent oxidation of single Fe layers, is presented. FeO/MgO(111) thin films were chemically and structurally characterized using low-energy electron diffraction, Auger electron spectroscopy and conversion electron Mossbauer spectroscopy (CEMS). Detailed in situ CEMS measurements as a function of the film thickness demonstrated a size-effect-induced evolution of the hyperfine parameters, with the thickest film exhibiting the bulk-wustite hyperfine pattern. Ex situ CEMS investigation confirmed the magnetic ordering of the wustite thin film phase at liquid nitrogen temperature.

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