Berlin 2008 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 51: Poster IV

HL 51.60: Poster

Thursday, February 28, 2008, 16:30–19:00, Poster D

Determination of charge state in Co- and Mn-doped ZnO films — •Daniel Markó¹, Kay Potzger¹, Karsten Küpper¹, Qingyu Xu¹, Shengqiang Zhou¹, Heidemarie Schmidt¹, Jürgen Faßbender¹, Michael Lorenz², Elke Arenholz³, and Jonathan D. Denlinger³ — ¹Forschungszentrum Dresden-Rossendorf e.V., Institut für Ionenstrahlphysik und Materialforschung, Bautzner Landstr. 128, D-01328 Dresden, Germany — ²Universität Leipzig, Institut für Experimentelle Physik II, Abteilung Halbleiterphysik, PO Box 100920, D-04009 Leipzig, Germany — ³Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA

We have investigated Co- and Mn-alloyed ZnO films grown by pulsed laser deposition (PLD) on a-plane sapphire substrates. X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) measurements have been performed at beamline 8.0.1 and beamline 6.3.1 at the Advanced Light Source in Berkeley, USA. From XAS spectra, recorded in both total electron yield and total fluorescence yield mode, the valence states of Mn and Co have been determined. No ferromagnetic properties have been observed by means of XMCD at 20 K at the L_2,3-absorption edges of Mn and Co, respectively. This observation agrees with the purely paramagnetic response of those Co- and Mn-alloyed ZnO films from SQUID magnetometry and Hall effect measurements.