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

SURFACE SCIENCE

卷:606

Article

Gurgul, Jacek¹  Mlynczak, Ewa¹  Spiridis, Nika¹  Korecki, Jozef^1,2 

[1] Polish Acad Sci, Jerzy Haber Inst Catalysis & Surface Chem, PL-30239 Krakow, Poland

[2] AGH Univ Sci & Technol, Fac Phys & Appl Comp Sci, PL-30059 Krakow, Poland

关键词: Iron oxide;    Wiistite;    FeO;    Epitaxial films;    Polar surface;    CEMS;   

DOI  :  10.1016/j.susc.2011.12.012

来源: Elsevier

【 摘 要 】

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-wiistite hyperfine pattern. Ex situ CEMS investigation confirmed existence of magnetic ordering of the wiistite thin film phase at liquid nitrogen temperature. (C) 2011 Elsevier B.V. All rights reserved.

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