Structure of Fe3O4(111) Films on Pt(111) and Ru(0001): The Role of Epitaxial Strain at the Iron Oxide/Metal Single Crystal Interface
Thin oxide films epitaxially grown on metal single crystal surfaces may exhibit structural properties that differ from the corresponding bulk oxide materials. The structure of the films is often rendered by their thickness, the structure and properties of the substrate and by the nature of the oxide/substrate interface. We prepared thin iron oxide films on Pt(111) and Ru(0001) and studied their structure using STM, LEED and XPS. The structure of FeO(111) – the iron oxide phase that forms at the interface with the metal single crystal – depends on the parameters of the support and is believed to further influence the structure of thicker iron oxide films, such as Fe3O4(111), that are being grown on top of it. In this article we discuss the role of one of the important parameters that may determine this structure – the epitaxial strain at the iron oxide/metal single crystal interface.
KeywordsIron oxides Fe3O4 Thin films Structure Epitaxial strain
This work was financially supported by the Polish Ministry of Science and Higher Education (Iuventus Plus programme, 2012–2015, grant No. IP2011 030071 – Ru(0001) part) and by the National Science Centre of Poland (SONATA programme, 2013–2016, grant No. 2012/05/D/ST3/02855 – Pt(111) part). S.J. acknowledges the support of the National Centre for Research and Development (PBS programme, 2012–2015, grant No. PBS1/A9/13/2012). M.L. would like to thank the Foundation for Polish Science for the START scholarship.
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