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NiO and MgO ultrathin films by polarization dependent XAS (Articolo in rivista)

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NiO and MgO ultrathin films by polarization dependent XAS (Articolo in rivista) (literal)

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Alternative label

P. Luches, E. Groppo, S. D'Addato, C. Lamberti, C. Prestipino, S. Valeri, F. Boscherini (2004)
NiO and MgO ultrathin films by polarization dependent XAS
in Surface science; ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, AMSTERDAM (Paesi Bassi)
(literal)

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P. Luches, E. Groppo, S. D'Addato, C. Lamberti, C. Prestipino, S. Valeri, F. Boscherini (literal)

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Note

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INFM National Research Centre on nanoStructures and bioSystems at Surfaces (S3), Via G. Campi 213/a, I-41100 Modena, Italy Dipartimento di Fisica, Università di Modena e Reggio Emilia, Via G. Campi 213/a, I-41100 Modena, Italy INFM and Dipartimento di Chimica Inorganica, Fisica e dei Materiali, Università di Torino, Via P. Giuria 7, I-10125 Torino, Italy INFM and Dipartimento di Fisica, Università di Bologna, Viale C. Berti Pichat 6/2, I-40127 Bologna, Italy (literal)

Titolo

Abstract

We present a comparative study of MgO and NiO ultrathin films on Ag(0 0 1) by polarization dependent X-ray absorption spectroscopy on both the metal and oxygen K-edges. The data have been analyzed using ab initio multiple-scattering calculations (FEFF code). We show that the films have the rock-salt structure with a negligible atomic interdiffusion with the substrate in all cases. Both MgO and NiO films are tetragonally strained to match the Ag substrate at low thickness and gradually relax their structure to the bulk one. The local in-plane and out-of-plane interatomic distances in the oxides have been accurately determined as a function of thickness and the elastic constants of the films have been found to be compatible with the bulk values. The oxygen absorption site has been found to be on top of Ag atoms, while the metal occupies the interstitial site in both systems. A significant increase of the interplanar distance at the interface between both MgO and NiO and the Ag substrate has been measured. (literal)

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