Journal
SURFACE SCIENCE
Volume 482, Issue -, Pages 809-816Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0039-6028(00)01066-9
Keywords
iron oxide; aluminum oxide; molecular beam epitaxy; single crystal epitaxy; oxidation; reflection high-energy electron diffraction (RHEED); low energy electron diffraction (LEED); X-ray photoelectron spectroscopy
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The growth of Fe3O4 on alpha -Al2O3 (0001) by atomic-oxygen-assisted molecular beam epitaxy has been studied by real time reflection high energy electron diffraction, low energy electron diffraction and X-ray photoelectron spectroscopy. The in-plane lattice parameter has been followed in situ during growth. For thickness below 1.5 nm, an iron oxide consisting on an expanded oxygen sub-lattice with an incomplete occupation of the Fe sites, is formed. This phase seems to be specific for a given thickness and independent of the growth conditions. For thickness above 1.5 nm, the long-range order of the Fe cations develops simultaneously with a decrease of the oxygen sub-lattice expansion. From this stage, Fe3O4 (111) is stabilised. (C) 2001 Elsevier Science B.V. All rights reserved.
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