Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 49: POSTER II
MA 49.32: Poster
Thursday, March 19, 2015, 15:00–18:00, Poster A
The effect of the microstructure on the structural dopant-host coordination of Co implanted TiO2 films — •Oguz Yildirim1,2, Steffen Cornelius1, Georgy Zukov3, Andrey Novikov3, Elena Ganshina3, Alexander Granovsky3, Alevtina Smekhova3, Carsten Baehtz4, and Kay Potzger1 — 1Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf e.V. , D-01328 Dresden, Germany — 2Technische Universität Dresden, D-01062 Dresden, Germany — 3Lomonosov Moscow State University (MSU), Faculty of Physics, Moscow, Russia — 4Rossendorf Beamline, European Synchrotron Radiation Facility, F-38043 Grenoble, France
TiO2 films, exhibiting amorphous, polycrystalline anatase or epitaxial anatase structures have been implanted with Co ions up to an atomic concentration of 5%. The influence of the structure of the host lattice on the local environment of the implanted Co atoms was investigated by a variety of techniques. For decreasing structural order, more oxide coordination was found for Co ions. I.e., for the epitaxial and polycrystalline films, Co atoms exhibit a mixed oxidation state of (+2) and (0) interpreted as substitutional and metallic environment at x-ray absorption measurements, respectively. The presence of metallic Co clusters inside the epitaxial film has also been confirmed by magnetometry and transmission electron microscopy. Substitutional CoTi for implanted epitaxial and polycrystalline anatase TiO2 films was confirmed by magneto-optic (MO) spectroscopy. On the other hand, for the amorphous film, the Co ions show oxidic environment.