Low-dimensional oxide nanostructures, supported on well-defined metal surfaces, have been the subject of intensive study because of their relevance both in fundamental physics and in technological applications [1,2]. The ultimate limit of an ultrathin oxide film is a two-dimensional (2-D) oxide monolayer on a metal substrate, consisting of only one unit cell in thickness. However, if the growth of oxide ultra-thin layers is performed on an iron substrates in a background pressure of oxygen (the so-called reactive deposition) the iron oxidation prevents the formation of a sharp interface [3]. In this oral, we show that a sharp interface between a single layer of chromium oxide and the Fe(001) surface can be obtained by growing the Cr on the pre-oxidized Fe(001)-p(1x1)O. Two chromium oxide phases have been detected at different Cr coverages, by using scanning tunnelling microscopy (STM) and low-energy electron diffraction (LEED) techniques. The experimental data are discussed in the light of ab-initio simulations of the electronic, energetic, and geometric properties of the growing film. Our findings demonstrate a potential to fabricate a sharp interface between the iron and transition metal oxides. References [1] F. P., Netzer, F. Allegretti, S. Surnev, J. Vac. Sci.Technol. B 28, 3268503 (2010). [2] G. Pacchioni and S. Valeri, Oxide Ultrathin Films (WILEY-VCH, Germany, 2012). [3] M. Finazzi, A. Brambilla, L. Duò, G. Ghiringhelli, M. Portalupi, F. Ciccacci, Phys. Rev. B 70, 235420 (2004).

Chromium oxide single layer on Fe(100)

PICONE, ANDREA;CALLONI, ALBERTO;RIVA, MICHELE;BUSSETTI, GIANLORENZO;BRAMBILLA, ALBERTO;DUO', LAMBERTO;CICCACCI, FRANCO;FINAZZI, MARCO
2012

Abstract

Low-dimensional oxide nanostructures, supported on well-defined metal surfaces, have been the subject of intensive study because of their relevance both in fundamental physics and in technological applications [1,2]. The ultimate limit of an ultrathin oxide film is a two-dimensional (2-D) oxide monolayer on a metal substrate, consisting of only one unit cell in thickness. However, if the growth of oxide ultra-thin layers is performed on an iron substrates in a background pressure of oxygen (the so-called reactive deposition) the iron oxidation prevents the formation of a sharp interface [3]. In this oral, we show that a sharp interface between a single layer of chromium oxide and the Fe(001) surface can be obtained by growing the Cr on the pre-oxidized Fe(001)-p(1x1)O. Two chromium oxide phases have been detected at different Cr coverages, by using scanning tunnelling microscopy (STM) and low-energy electron diffraction (LEED) techniques. The experimental data are discussed in the light of ab-initio simulations of the electronic, energetic, and geometric properties of the growing film. Our findings demonstrate a potential to fabricate a sharp interface between the iron and transition metal oxides. References [1] F. P., Netzer, F. Allegretti, S. Surnev, J. Vac. Sci.Technol. B 28, 3268503 (2010). [2] G. Pacchioni and S. Valeri, Oxide Ultrathin Films (WILEY-VCH, Germany, 2012). [3] M. Finazzi, A. Brambilla, L. Duò, G. Ghiringhelli, M. Portalupi, F. Ciccacci, Phys. Rev. B 70, 235420 (2004).
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/883020
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