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Title: The electronic structure of homogeneous ferromagnetic (Ga, Mn)N epitaxial films

X-ray Absorption Fine Structure (XAFS) techniques, namely, X-ray Near Edge Structure (XANES), Extended XAFS (EXAFS), and Anomalous X-ray Diffraction (AXRD) were used to investigate the local atomic and electronic structure of (Ga, Mn)N magnetic layers with Mn concentrations of up to 10% grown by Molecular Beam Epitaxy. The XANES and AXRD analysis prove the Mn incorporation on substitutional GaN lattice sites. EXAFS results indicate the good quality of the structure under examination, although 0.5 nitride atom vacancies were found. The Wien2k code was applied to interpret the XANES spectra quantitatively, i.e., to determine the electronic structure of the Mn atoms. It was shown that accounting for the core-hole effect is necessary to reconstruct effectively the XANES spectra. Conducted charge density analysis based on DFT calculations identified the valency of Mn atom to be of 2.4+.
Authors:
 [1] ;  [2] ;  [1] ; ;  [3] ;  [4] ; ;  [5] ;  [3] ;  [6] ;  [6] ;  [7]
  1. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Institute W. Trzebiatowski, Wroclaw (Poland)
  2. (Germany)
  3. Institute of Solid State Physics, University of Bremen, Bremen (Germany)
  4. Institute of Physic, Polish Academy of Sciences, Warsaw (Poland)
  5. Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstraße 400, 01328 Dresden (Germany)
  6. (Poland)
  7. Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University in Prague, Praha (Czech Republic)
Publication Date:
OSTI Identifier:
22413119
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 6; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTROSCOPY; ATOMS; CHARGE DENSITY; CONCENTRATION RATIO; ELECTRONIC STRUCTURE; FILMS; FINE STRUCTURE; GALLIUM NITRIDES; HOLES; LAYERS; MANGANESE NITRIDES; MOLECULAR BEAM EPITAXY; VACANCIES; VALENCE; X-RAY DIFFRACTION; X-RAY SPECTROSCOPY