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Title

Co on Fe3O4(001): Towards precise control of surface properties

AuthorsGargallo-Caballero, R.; Martín-García, L.; Quesada, Adrián; Granados-Miralles, Cecilia; Foerster, M.; Aballe, L.; Bliem, R.; Parkinson, G.S.; Blaha, P.; Marco, J.F. ; de la Figuera, Juan
Issue Date2016
PublisherAmerican Institute of Physics
CitationJournal of Chemical Physics 144 (2016)
AbstractA novel approach to incorporate cobalt atoms into a magnetite single crystal is demonstrated by a combination of x-ray spectro-microscopy, low-energy electron diffraction, and density-functional theory calculations. Co is deposited at room temperature on the reconstructed magnetite (001) surface filling first the subsurface octahedral vacancies and then occupying adatom sites on the surface. Progressive annealing treatments at temperatures up to 733 K diffuse the Co atoms into deeper crystal positions, mainly into octahedral ones with a marked inversion level. The oxidation state, coordination, and magnetic moments of the cobalt atoms are followed from their adsorption to their final incorporation into the bulk, mostly as octahedral Co. This precise control of the near-surface Co atoms location opens up the way to accurately tune the surface physical and magnetic properties of mixed spinel oxides.
URIhttp://hdl.handle.net/10261/139746
DOI10.1063/1.4942662
Identifiersdoi: 10.1063/1.4942662
issn: 0021-9606
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