Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 55: Poster II
MA 55.84: Poster
Freitag, 4. April 2014, 10:30–13:30, P2
Preparation and structural and magnetic characterisation of transition metal-doped ZnO thin films. — •Vasantha Venkataraman1, Verena Ney1, Katharina Ollefs2, Fabrice Wilhelm2, Andrei Rogalev2, and Andreas Ney1 — 1Division of Solid State Physics, Johannes Kepler University, Linz, Austria — 2European Synchrotron Radiation Facility (ESRF), Grenoble, France
Numerous experimental studies have surfaced involving doping of ZnO thin films with transition metals (TM:ZnO). Though neither Cu, nor its oxides are ferromagnetic, reports of ferromagnetic Cu:ZnO can be found [1]. By DC reactive magnetron sputter deposition, we have prepared Cu:ZnO films on c-plane sapphire. By varying the proportions of the reactant (O2) and carrier (Ar) gases, we have a series of samples and have found three separate regimes. The regimes show a marked difference in terms of their apparent colour. Using x-ray absorption spectroscopy at the Cu-K edge, we have probed the series in order to establish an interrelation between the observed magnetic behavior and the local atomic positioning of dopant Cu atoms and the valence [2]. The XANES point to the oxidation states in the different regimes and XLD in turn indicates the substitution of the Zn atom sites by Cu as being unfavourable. SQUID magnetometry on the series has revealed paramagnetic behavior irrespective of regime.
[1] T. S. Herng et al., Phys. Rev. Lett. 105, 207201 (2010)
[2] J. L. DuBois et al., J. Am. Chem. Soc. 122, 5775 - 5787 (2000)