Dresden 2006 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 9: Poster I

HL 9.27: Poster

Montag, 27. März 2006, 15:15–17:45, P3

Growth and characterization of Mn- and Co- doped ZnO nanowires — •Andreas Rahm, Evgeni M. Kaidashev, Heidemarie Schmidt, Mariana Diaconu, Andreas Pöppl, Rolf Böttcher, Christoph Meinecke, Tilman Butz, Michael Lorenz, and Marius Grundmann — Universität Leipzig, Fakultät für Physik und Geowissenschaften, Linnéstr. 5, D-04103 Leipzig, Germany

ZnO based nanostructures have attracted increasing interest in recent years due to their structural diversity. Furthermore, transition metal doping (e.g. by Co or Mn) of ZnO has been predicted [1] and shown [2] to create a promising ferromagnetic material for spintronics. We report on the high-pressure pulsed laser deposition growth of zinc oxide nanowires [3] containing about 0.2 at-% Co and 0.5 at-% Mn by NiO and Au catalyst. Scanning electron microscopy and X-ray diffraction measurements revealed arrays of parallel-standing nanowires with hexagonal cross section and uniform in-plane epitaxial relations without rotational domains. Elemental analysis was carried out using particle induced X-ray emission and Q-band electron spin resonance. The valence of the incorporated Mn was determined to be 2+. Atomic and magnetic force microscopy measurements indicate that Mn is incorporated preferentially at the nanowire boundaries. [1] T. Dietl , H. Ohno, F. Matsukura, J. Cibert, D. Ferrand, Sciene 287, 1019 (2000) [2] K. Ueda, H. Tabata, T. Kawai, Appl. Phys. Lett. 79, 988 (2001) [3] M. Lorenz, E.M. Kaidashev, A. Rahm, T. Nobis, J. Lenzner, G. Wagner, D. Spemann, H. Hochmuth, M. Grundmann, Appl. Phys. Lett. 86 (2005), 143113