Identification of Different Electron Screening Behavior Between the Bulk and Surface of (Ga,Mn)As

J. Fujii, M. Sperl, S. Ueda, K. Kobayashi, Y. Yamashita, M. Kobata, P. Torelli, F. Borgatti, M. Utz, C. S. Fadley, A. X. Gray, G. Monaco, C. H. Back, G. van der Laan, and G. Panaccione
Phys. Rev. Lett. 107, 187203 – Published 27 October 2011

Abstract

We report x-ray photoemission spectroscopy results on (Ga,Mn)As films as a function of both temperature and Mn doping. Analysis of Mn 2p core level spectra reveals the presence of a distinct electronic screening channel in the bulk, hitherto undetected in more surface sensitive analysis. Comparison with model calculations identifies the character of the Mn 3d electronic states and clarifies the role, and the difference between surface and bulk, of hybridization in mediating the ferromagnetic coupling in (Ga,Mn)As.

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  • Received 25 July 2011

DOI:https://doi.org/10.1103/PhysRevLett.107.187203

© 2011 American Physical Society

Authors & Affiliations

J. Fujii1, M. Sperl2, S. Ueda3, K. Kobayashi3, Y. Yamashita3, M. Kobata3, P. Torelli1, F. Borgatti4, M. Utz2, C. S. Fadley5,6, A. X. Gray5,6, G. Monaco7, C. H. Back2, G. van der Laan8, and G. Panaccione1

  • 1CNR Istituto Officina dei Materiali (IOM), Laboratorio TASC, S.S.14, Km 163.5, I-34149 Trieste, Italy
  • 2Institut für Experimentelle Physik, Universität Regensburg, D-93040 Regensburg, Germany
  • 3NIMS beamline Station at Spring-8, National Institute for Materials Science, Sayo, Hyogo 679-5148, Japan
  • 4CNR Istituto per lo Studio dei Materiali Nanostrutturati (ISMN), via P. Gobetti 101, I-40129 Bologna, Italy
  • 5Department of Physics, University of California, Davis, California 95616, USA
  • 6Material Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 7European Synchrotron Radiation Facility (ESRF), BP 220, F-38043 Grenoble, France
  • 8Diamond Light Source, Chilton, Didcot, Oxfordshire OX11 0DE, United Kingdom

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Issue

Vol. 107, Iss. 18 — 28 October 2011

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