IFLP   13074
INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
XAFS study of ferromagnetic Cu doped TiO2 thin films
Autor/es:
C.E. RODRÍGUEZ TORRES; L. A. ERRICO; F. GOLMAR; A.M. MUDARRA NAVARRO; A.F. CABRERA; S. DUHALDE; M. RENTERÍA; F.H. SÁNCHEZ
Revista:
LNLS- Activity report 2005
Editorial:
Brazilian Synchrotron Light Laboratory
Referencias:
Año: 2006 p. 1 - 2
ISSN:
1518-0204
Resumen:
A variety of semiconducting materials, called diluted magnetic semiconductors (DMS), combine two properties: semiconductivity and magnetism. While most of the DMS have a Curie temperatue (TC) much lower than room temperature, room-temperature ferromagnetism has been observed in some Mn-doped compounds such as ZnO. In 2001-2002, Co-doped TiO2 thin films with the anatase and the rutile structures were reported to be ferromagnetic even above 400 K. These results have motivated intensive experimental  and theoretical studies on the structural and electronic properties of these materials. In recent years, the theoretical and experimental studies were extended to other magnetic (Mn, Fe, Ni) and non magnetic impurities, for example, Cu. However, due to intrinsic complexities, many questions remain concerning the underlying microscopic mechanism of short, middle, and long-range magnetic order and the precise location of the impurities in the host lattice. Another important question to respond is why does the doping with non magnetic elements result in strong ferromagnetic samples. In order to understand these questions, Cu-doped TiO2 thin films, grown by pulsed laser deposition (PLD), were studied by x-ray absorption spectroscopy (XAFS) in order to determine the valence state and local environment of the impurities as a function of composition and to relate these features with the magnetic properties.