XAS study of the local environment of impurities in doped TiO2 thin films

• Published in: Physica. B, Condensed matter Vol. 398; no. 2; pp. 219 - 222
• Main Authors: RODRIGUEZ TORRES, C. E, CABRERA, A. F, ERRICO, L. A, DUHALDE, S, RENTERIA, M, GOLMAR, F, SANCHEZ, F. H
• Format: Conference Proceeding Journal Article
• Language: English
• Published: Amsterdam Elsevier 01-09-2007
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Magnetic properties and materials; Magnetic semiconductors; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Other interactions of matter with particles and radiation; Physics; Studies of specific magnetic materials; X-ray absorption and absorption edges; 75.50Pp; 75.70.-i; 61.10.Ht; Doping; Ferromagnetic materials; Pulsed laser deposition; Diluted magnetic semiconductors; Thin films; EXAFS; XANES; Semimagnetic semiconductors; Thin films; Titanium oxides; Local structure; Impurities; X-ray absorption spectra; Transition element additions; Ferromagnetism
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2007.04.020

In this work, we present an X-ray absorption spectroscopy (XAS) characterization of the local environment of the impurity in room temperature ferromagnetic (RTF) anatase TiO2 thin films doped with Co, Ni, Cu, or Zn, deposited on LaAlO3 substrate by pulsed laser deposition (PLD). It was found that there is a considerable amount of impurity atoms substituting Ti in TiO2 anatase, although the presence of metal transition monoxide clusters can not be discarded. From our results, we infer that the observed RT ferromagnetism of the samples could be assigned to the metal transition atoms replacing Ti in TiO2 anatase.