Epitaxial Growth of Iron Oxide Films on Ag(111)
Epitaxial iron oxide films are grown on Ag(1 1 1) by two methods. The oxide films are characterized using low-energy electron diffraction, X-ray photoelectron spectroscopy, and X-ray photoelectron diffraction. The first growth method is deposition of Fe films with thickness ranging from 1-10 monolayers on Ag(1 1 1) and oxidizing these films. The Fe film structure prior to oxidation is identified as poorly ordered bcc-Fe(1 1 0), and oxidation leads to the growth of poorly ordered FeO(1 1 1) films. The second method is sequential deposition of sub-monolayer Fe films (typically less-than-or-equals, slant0.5 ML) followed by oxidation. This procedure is repeated until the desired oxide film thickness is achieved. Iron oxide films grown by sequential deposition are identified as FeO(1 1 1) for oxide film thickness below not, vert, similar10 Å with growth of Fe3O4(1 1 1) for thicker films. Iron oxide films grown by the sequential deposition method have much better crystallographic order than those grown by oxidizing thicker iron films. Finally, the surface termination of the Fe3O4(1 1 1) films is investigated using X-ray photoelectron diffraction.
G. D. Waddill and O. Ozturk, "Epitaxial Growth of Iron Oxide Films on Ag(111)," Surface Science, Elsevier, Jan 2005.
The definitive version is available at http://dx.doi.org/10.1016/j.susc.2004.10.050
University of Missouri Research Board
Keywords and Phrases
Electron-Solid Diffraction; Growth; Iron Oxide; Low Energy Electron Diffraction (LEED); Oxidation; Photoelectron Diffraction; Single Crystal Epitaxy; Epitaxy; Thin films
Article - Journal
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