Initial Stages of the Growth of Mixed Iron-cobalt Oxides on Ru(0001)
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 previous...
| Authors: | , , , , , |
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| Format: | article |
| Publication Date: | 2016 |
| Country: | España |
| Institution: | Universitat Autònoma de Barcelona |
| Repository: | Dipòsit Digital de Documents de la UAB |
| Language: | English |
| OAI Identifier: | oai:ddd.uab.cat:202507 |
| Online Access: | https://ddd.uab.cat/record/202507 https://dx.doi.org/urn:doi:10.1016/j.phpro.2016.11.075 |
| Access Level: | Open access |
| Keyword: | Cobalt monoxide Iron monoxide Reactive molecular beam epitaxy Low-energy electron microscopy Selected area x-ray absorption Photoemission electron microscopy |
| Summary: | 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. |
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