Regensburg 2007 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 15: Poster Session

DS 15.17: Poster

Dienstag, 27. März 2007, 15:00–17:00, Poster B

Structural properties of cobalt implanted TiO₂ rutile films — •Numan Akdogan¹, Alexei Nefedov¹, Werner Becker², Rustam Khaibullin³, Lenar Tagirov^3,4, and Hartmut Zabel¹ — ¹Institut für Experimentalphysik IV, Ruhr-Universität Bochum — ²Institut für Physik mit Ionenstrahlen, Ruhr-Universität Bochum — ³Kazan Physical-Technical Institute of RAS — ⁴Kazan State University

Recently we have reported room temperature ferromagnetism (FM) and in-plane magnetic anisotropy of single-crystalline rutile structures after high dose Co implantation [1]. From the observation of in-plane magnetic anisotropy we concluded that FM in this system results from incorporation of Co ions in the TiO₂ lattice, but co-existence with Co nanoclusters could not be excluded. To clarify this situation we studied the structural properties of Co-doped (100)-oriented rutile TiO₂ single crystals for different implantation doses. Co ions implanted into rutile TiO₂ substrates with energy of 40 keV and implantation dose in the range of 0.25-1.50·10¹⁷ ions/cm². The structural characterization was carried out using synchrotron radiation at the HASYLAB. The specular and off-specular reflectivity measurements probe the implanted Co density profile. In addition, with RBS the depth profile was determined and used for fitting the x-ray reflectivity data. This way a consistent and very good agreement of the fit to the x-ray reflectivity data could be achieved. - Partial support by SFB 491, by RFBR (grant 04-02-97505), and by TUBITAK (project 104T176) is acknowledged. N. Akdogan acknowledges a fellowship through IMPRS-SurMat. [1] N. Akdogan et al., J. Phys.: Condens. Matter. 17, L359 (2005)