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Structural and magnetic properties of transition metal oxide thin films grown on Ru(0001)

AuthorsMandziak, Anna; de la Figuera, Juan ; Delgado Soria, Guiomar; Sánchez, M.; Prieto, P.; Quesada, A.; Foerster, M.; Aballe, L.
Issue Date24-Jun-2019
Citation9th International Workshop on Surface Physics (2019)
AbstractTransition metal oxides (TMO) are promising candidate materials for future spintronic devices. Their properties arise from the interaction between transition metal and oxygen ions in a given structure which are very sensitive to different bond length and angles, as well as to their particular cationic distribution. However, their properties in thin film form, as required for the use in microelectronic devices, are often disappointing, since interface and surface effects, as well as defects can play strong roles. Thus, a detailed understanding of magnetic and transport properties of ultrathin films at such scale are needed, which enables us to optimize the fabrication methods. Here we demonstrate a route for preparing high quality ultrathin ternary transition metal oxide films on a metallic substrate. Mixed nickel, iron and cobalt oxides have been grown on Ru(0001) by high temperature oxygen- assisted molecular beam epitaxy. The nucleation and growth process are observed in real time by means of Low Energy Electron Microscopy (LEEM), which enables to optimize of the growth parameters. A comprehensive characterization is performed combining LEEM and LEED for structural characterization and PEEM (PhotoEmission Electron Microscopy) with synchrotron radiation for chemical and magnetic analysis via X-ray Absorption Spectroscopy, X-ray Magnetic Circular Dichroism and X-ray Magnetic Linear Dichroism (XAS-PEEM, XMCD-PEEM and XMLD- PEEM, respectively). Depending on the chosen stoichiometry and conditions, either spinel ferrites or monoxides of rocksalt structure can be prepared. The spinel ferrites show ferromagnetic contrast. While the monoxide one present long range antiferromagnetic ordering with the Néel temperature above the room temperature. The high crystalline and morphological quality of prepared films result in optimized properties with respect to films grown by other methods, such as magnetic domains which are larger by several orders of magnitude.
Description9th IWSP: Nanostructured surfaces, Trzebnica, Poland, 24 – 28 June 2019. -- http://www.iwsp2019.ifd.uni.wroc.pl/
Appears in Collections:(IQFR) Comunicaciones congresos
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