XAS and XMCD study of the Mn interface formation at the GaAs(001) 2x4 surface (Abstract/Poster in convegno)

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Label
  • XAS and XMCD study of the Mn interface formation at the GaAs(001) 2x4 surface (Abstract/Poster in convegno) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Alternative label
  • S. Colonna, E. Placidi, V. Sessi, E. Jimenez Romero, F. Arciprete (2013)
    XAS and XMCD study of the Mn interface formation at the GaAs(001) 2x4 surface
    in FisMat 2013, Milano, 09-09-2013
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • S. Colonna, E. Placidi, V. Sessi, E. Jimenez Romero, F. Arciprete (literal)
Note
  • Poster (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR - Istituto di Struttura della Materia, Rome, Italy European Synchtron Radiation Facility, Grenoble, France Johannes Kepler University, Linz, Austria Dipartimento di Fisica Università di Roma Tor Vergata, Rome, Italy (literal)
Titolo
  • XAS and XMCD study of the Mn interface formation at the GaAs(001) 2x4 surface (literal)
Abstract
  • Two-dimensional systems, such as ultrathin epitaxial films and superlattices, exhibit magnetic properties distinct from bulk materials. Despite the extensive research on the magnetic properties of metal nano-structures and more recently metal oxide interfaces containing magnetic ions, the investigation of magnetic semiconductors with reduced dimensions is still moving its first steps. The interest in this field is boosted by the hoped development of spintronics devices. In this respect Mn based alloys are promising elements for spin injection in semiconductors given the half full shell and therefore large atomic spin of Mn atoms. As the efficiency in the spin injection depends on the interface quality, surface alloys of semiconductors containing Mn atoms can be used to model the interface magnetic and electronic properties. In particular, a careful study of Mn coordination, spin state, charge and magnetic ordering as a function of Mn content and/or preparation method can be extremely important for the development of spintronic-based devices. In spite of this strong interest only few papers deal with the first stages of the Mn/GaAs(001) interface both on the (2×4) and c(4×4) reconstructed GaAs(001) surfaces. Here we present an investigation, by means of X-ray Absorption Spectroscopy (XAS) and X-ray Magnetic Circular Dichroism (XMCD) at the Mn L2,3 absorption edges, of the magnetic properties and the local atomic coordination of a two-dimensional system obtained by Mn atoms ordering on the GaAs(001) surface for Mn thickness ranging from 1/8 to 1 ML. The proposed system, already extensively investigated by STM and LEED by our group, showed a strong dependence of the Mn/GaAs(001) surface reconstruction on the preparation method. Further, the surface reconstruction undergoes a phase transition from (2×1) to (2×2) when increasing the Mn coverage on a hot substrate (390°C) up to 1/2 monolayer (ML). [1] The combination of XAS and XMCD investigation has allowed obtaining information on the local atomic coordination around the Mn sites and its influence on the surface magnetic properties. In order to study the magnetic anisotropy of the atomic rows at the surface, XMCD and XAS measurements have been performed for different orientations of the magnetic field B with respect to the sample surface. [1] S. Colonna et al. J. App. Phys. 109 (2011) 123522 (literal)
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