Berlin 2012 – scientific programme
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KR: Fachgruppe Kristallographie
KR 5: Poster I – including Multiferroics (MA with DF, DS, KR, TT)
KR 5.23: Poster
Tuesday, March 27, 2012, 12:15–15:15, Poster A
Incorporation of N codopants in Co:ZnO investigated by X-ray absorption spectroscopy — •Daniel Schauries1, Andreas Ney1, Verena Ney1, Fabrice Wilhelm2, Andre Rogalev2, and Flora Yakhou2 — 1Fakultät für Physik, Universität Duisburg-Essen, Lotharstr. 1, D-47057 Duisburg, Germany — 2European Synchrotron Facility, 6 Rue Jules Horowitz, BP 220, 38043 Grenoble Cedex, France
p-doping of ZnO in general remains a grand challenge for material science. In particular p-type ZnO is of interest to investigate the perspectives for obtaining RT-ferromagnetism in p-type Co:ZnO.
We have grown Co:ZnO:N(0001) on sapphire substrates using reactive magnetron sputtering from Co/Zn targets at Co concentrations of 10, 15 and 20% and different Ar : O2 : N2 sputter gas compositions.
The structure was studied by synchrotron-based element specific X-ray absorption spectroscopy. All edges were measured with the electric field of the X-rays perpendicular and parallel to the c-axis to obtain X-ray Linear Dichroism (XLD). Subsequently all spectra for the Zn, Co, O and N-K-edge were simulated with FDMNES[1] to determinate the positions of the species. While Co only occupies Zn-sites, the situation turned out to be more complex for N — for low N2-concentration in the sputter gas probably incorporated N2 was formed, high N2-levels also led to the formation of substitutional N atoms on O-sites.
The resulting magnetic properties of Co:ZnO:N will be discussed as well. We greatfully acknowledge financial support from the DFG through the Heisenberg Programme.
[1] Y. Joly, Phys. Rev. B 63, 125120-125129 (2001).