Journal
IN SITU STUDIES OF FUNCTIONAL NANOMATERIALS AT LARGE SCALE FACILITIES: FROM MODEL SYSTEMS TO APPLICATIONS
Volume 85, Issue -, Pages 12-19Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.phpro.2016.11.075
Keywords
cobalt monoxide; iron monoxide; reactive molecular beam epitaxy; low-energy electron microscopy; selected area x-ray absorption; photoemission electron microscopy
Funding
- Spanish Ministry of Economy and Competitiveness [MAT2015-64110-C2-1-P, MAT2015-64110-C2-2-P, MAT2013-48009-C4-1-P]
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Mixed 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. (C) 2016 The Authors. Published by Elsevier B.V.
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