Structure of epitaxial (Fe,N) codoped rutile TiO2 thin films by x-ray absorption

T. C. Kaspar, A. Ney, A. N. Mangham, S. M. Heald, Y. Joly, V. Ney, F. Wilhelm, A. Rogalev, F. Yakou, and S. A. Chambers
Phys. Rev. B 86, 035322 – Published 23 July 2012

Abstract

Homoepitaxial thin films of Fe:TiO2 and (Fe,N):TiO2 were deposited on rutile(110) by molecular beam epitaxy. X-ray absorption near edge spectroscopy (XANES) spectra were collected at the Ti L-edge, Fe L-edge, Ti K-edge, O K-edge, and N K-edge. No evidence of structural disorder associated with a high concentration of oxygen vacancies is observed. Substitution of Fe for Ti could be inferred, and secondary phases such as Fe2O3, Fe3O4, and FeTiO3 can be ruled out. The similarity of the N K-edge spectra to O, and the presence of a strong x-ray linear dichroism signal for the N K-edge, indicates that N is substitutional for O in the rutile lattice and is not present as a secondary phase such as TiN. Simulations of the XANES spectra confirm substitution, although N appears to be present in more than one local environment. Neither Fe:TiO2 nor (Fe,N):TiO2 exhibit intrinsic room temperature ferromagnetism, despite the presence of mixed valent Fe(II)/Fe(III) in the reduced (Fe,N):TiO2 film.

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  • Received 11 May 2012

DOI:https://doi.org/10.1103/PhysRevB.86.035322

©2012 American Physical Society

Authors & Affiliations

T. C. Kaspar1,*, A. Ney2,†, A. N. Mangham1, S. M. Heald3, Y. Joly4, V. Ney2,†, F. Wilhelm5, A. Rogalev5, F. Yakou5, and S. A. Chambers1

  • 1Fundamental and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, USA
  • 2Faculty of Physics and CeNIDE, University of Duisburg-Essen, 47057 Duisburg, Germany
  • 3Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 4Institut Néel, CNRS et Université Joseph Fourier, BP 166, F-38042 Grenoble Cedex 9, France
  • 5European Synchrotron Radiation Facility (ESRF), BP 220, 38043 Grenoble Cedex, France

  • *Corresponding author: tiffany.kaspar@pnl.gov
  • Present address: Department of Solid State Physics, Johannes Kepler University, A-4040 Linz, Austria.

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Issue

Vol. 86, Iss. 3 — 15 July 2012

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