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HL: Fachverband Halbleiterphysik

HL 46: Poster 2

HL 46.52: Poster

Donnerstag, 29. März 2007, 15:00–17:30, Poster A

Magnetic circular dichroism of Co doped ZnO — •Christoph Knies¹, Swen Graubner¹, Jan Stehr¹, Detlev M. Hofmann¹, Tom Kammermeier², Andreas Ney², and Nikolai Romanov³ — ¹University of Giessen, I. Physics Institute, Heinrich-Buff-Ring 16, D-35392 Giessen — ²Universität Essen-Duisburg, MC-EXT "Maglomat", Experimetalphysik, Universität Duisburg-Essen, Lotharstr. 1, D-47057 Duisburg — ³A. F. Ioffe Institute, St. Petersburg, Russia

Co doped ZnO is an interesting material for room temperature spintronic applications. Poly-crystalline ZnO samples doped with Co were synthesized in our group by a wet chemical synthesis using dip coating for the film formation. The magnetic properties of the samples were investigated by temperature and magnetic field dependent circular dichroism (MCD) measurements. We observe groups of optical transitions in the near infrared (∼0.9 eV) and visible (∼2.9 eV) spectral range which are caused by Co²⁺ internal excitations. At energies of above 3.0 eV is the onset of a Co²⁺ to Co⁺ charge transfer transition located. The MCD results are discussed in respect to magnetisation measurements which show a hysteresis like behaviour for samples doped with 2% and 5% Co.