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Initial Stages of the Growth of Mixed Iron-cobalt Oxides on Ru(0001)

AuthorsMartín-García, L.; Quesada, Adrián ; Pérez, L.; Foerster, M.; Aballe, L.; de la Figuera, Juan
Keywordscobalt monoxide, iron monoxide, reactive molecular beam epitaxy, low-energy electron microscopy, selected area x-ray absorption, photoemission electron microscopy
Issue Date2016
CitationPhysics Procedia 85: 12- 19 (2016)
AbstractMixed iron-cobalt oxides have been grown on a Ru(0001) single crystal substrate by reactive molecular beam epitaxy. The growth has been followed by low-energy electron microscopy and diffraction. Chemical characterization has been performed by selected area x-ray absorption spectroscopy. As previously known, iron grows into a wetting layer of FeO. In contrast, cobalt grows into three-dimensional islands of CoO, of either with a (111) -most common- or a (100) orientation. For mixed compositions, flat 2D growth is regained. Depending on temperature, either segregation into two FeCo compositions or a single phase is detected. In all cases the structure corresponds to an in-plane expanded (111)-oriented halite one. When only one phase is observed or for the Co-rich phase in the two phase film, its crystal structure is rotated by 30¿ relative to the Ru substrate, unlike the Co-poor phase which appears aligned with the substrate.
Identifiersdoi: 10.1016/j.phpro.2016.11.075
issn: 1875-3892
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