Dresden 2009 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 9: Poster 1
HL 9.34: Poster
Montag, 23. März 2009, 14:30–17:00, P2
Magnetic and magneto-transport properties of self-assembled MnAs-nanoclusters on undoped GaInAs-surfaces. — •Matthias T. Elm1, Shinjiroh Hara2, Hans-Albrecht Krug von Nidda3, and Peter J. Klar1 — 1Institute of Experimental Physics I, Justus-Liebig University Gießen, Germany — 2Research Center for Integrated Quantum Electronics, Hokkaido University, Sapporo, Japan — 3Experimentalphysik V, University of Augsburg, Germany
Self-assembled MnAs nanoclusters were grown on undoped GaInAs/InP (111)B-substrate by MOVPE. The MnAs nanoclusters were randomly distributed on the samples. The c-axis of all clusters is orientated perpendicular to the growth direction. The lateral size and height of typical nanoclusters are 100 and 47 nm, respectively. The density of the nanoclusters varies from 2.8×108 to 6.6×108 cm−2 due to different growth conditions. The growth of the MnAs nanoclusters leads to a p-type conductivity of the samples with carrier concentrations of about 2×1018cm−3 at room temperature. The magnetic properties were probed by ESR measurements in order to determine the magnetic anisotropy of the clusters. The samples were also investigated by angle-dependent magneto-transport measurements in the temperature range from 20 to 280 K in external magnetic fields up to 10 T. The differences in the temperature-dependent behavior, in the magneto-resistance as well as the influence of the ferromagnetic clusters on the transport will be discussed.