Initial Stages of the Growth of Mixed Iron-cobalt Oxides on Ru(0001)
Martín García, Laura (Instituto de Química Física "Rocasolano")
Quesada, Adrian (Instituto de Cerámica y Vidrio (CSIC))
Pérez, Lucas (Universidad Complutense de Madrid)
Foerster, Michael (ALBA Laboratori de Llum de Sincrotró)
Aballe, Lucía (ALBA Laboratori de Llum de Sincrotró)
Figuera, Juan de la (Instituto de Química Física "Rocasolano")

Date:	2016
Abstract:	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.
Grants:	Ministerio de Economía y Competitividad MAT2015-64110-C2-1-P Ministerio de Economía y Competitividad MAT2015-64110-C2-2-P Ministerio de Economía y Competitividad MAT2013-48009-C4-1-P
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Cobalt monoxide ; Iron monoxide ; Reactive molecular beam epitaxy ; Low-energy electron microscopy ; Selected area x-ray absorption ; Photoemission electron microscopy
Published in:	Physics Procedia, Vol. 85 (2016) , p. 12-19, ISSN 1875-3892

DOI: 10.1016/j.phpro.2016.11.075

8 p, 8.3 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > The ALBA Synchrotron
Articles > Research articles
Articles > Published articles