Atom-thick oxides at the Fe(001) surface: from the playground for theory and experiments to applications

DIPC Seminars

Speaker
Guido Fratesi, Dep. Physics, University of Milan
When
2019/04/04
14:00
Place
Donostia International Physics Center
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Atom-thick oxides at the Fe(001) surface: from the playground for theory and experiments to applications Chemisorption of a single atomic layer of oxygen on the Fe(001) surface yields a highly ordered and reproducible substrate [1]. This constitutes a benchmark for theoretical and experimental studies, and can be used as a convenient substrate for the epitaxial growth of metal oxides and hybrid interfaces with foreseen applications e.g. in organic spintronics. This talk presents ab initio investigations that have supplemented surface- science experiments in the last decade, starting from features of oxidized Fe(001) and of other atom-thick oxides grown thereof: From the understanding of corrugation reversal in scanning tunneling microscopy images [2], to the modification of diffusion pathways for heteroepitaxial metal atoms e.g. in the growth of oxidized Co films on Fe(001) [3,4]; then we focus on the electronic and magnetic properties of two dimensional Chromium oxides of Cr3O4 and Cr4O5 stoichiometry which can be stabilized on Fe(001), featuring an antiferromagnetic alignment with underlying Fe(001) [5,6]. We eventually consider the effect of inserted Cr4O5 layers at the interface between C60 and Fe(001), demonstrating that this enhances the magnetic hybridization between the molecule and the surface [7,8]. The spin density on the molecule reflects the magnetic electronic properties of the surface. As seen from the substrate, adsorbates can influence the magnitude and even orientation of Cr magnetic moments. Tailoring of this substrate is therefore effective in controlling the properties of the interface. References: [1] A. Picone, M. Riva, A. Brambilla, A. Calloni, G. Bussetti, M. Finazzi, F. Ciccacci, L. Duò, Surface Science Reports 71, 32 (2016). [2] A. Picone, G. Fratesi, A. Brambilla, P. Sessi, F. Donati, S. Achilli, L. Maini, M.I. Trioni, C.S. Casari, M. Passoni, A. Li Bassi, M. Finazzi, L. Duò, and F. Ciccacci, Phys. Rev. B 81, 115450 (2010) [3] A. Picone, M. Riva, G. Fratesi, A. Brambilla, G. Bussetti, M. Finazzi, L. Duò, and F. Ciccacci, Phys. Rev. Lett. 113, 046102 (2014) [4] M. Riva, A. Picone, D. Giannotti, A. Brambilla,G. Fratesi, G. Bussetti, L. Duò, F. Ciccacci, and M. Finazzi, Phys. Rev. B 92, 115434 (2015) [5] A. Picone, G. Fratesi, M. Riva, G. Bussetti, A. Calloni, A. Brambilla, M. I. Trioni, L. Duò, F. Ciccacci, and M. Finazzi, Phys. Rev. B 87, 085403 (2013) [6] A. Calloni, G. Fratesi, S. Achilli, G. Berti, G. Bussetti, A. Picone, A. Brambilla, P. Folegati, F. Ciccacci, and L. Duò, Phys. Rev. B 96, 085427 (2017) [7] A. Brambilla, A. Picone, D. Giannotti, A. Calloni, G. Berti, G. Bussetti, S. Achilli, G. Fratesi, M. I. Trioni, G. Vinai, P. Torelli, G. Panaccione, L. Duò, M. Finazzi, and F. Ciccacci, Nano Lett. 17, 7440 (2017) [8] A. Brambilla, A. Picone, S. Achilli, G. Fratesi, A. Lodesani, A. Calloni, G. Bussetti, M. Zani, M. Finazzi, L. Duò, and F. Ciccacci Journal of Applied Physics, in press (2019). Host: Daniel Sánchez Portal