Atom-thick oxides at the Fe(001) surface: from the playground for theory and experiments to applications
DIPC Seminars
- Speaker
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Guido Fratesi, Dep. Physics, University of Milan
- When
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2019/04/04
14:00 - Place
- Donostia International Physics Center
- Add to calendar
-
iCal
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