Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 16: Micro- and Nanostructured Magnetic Materials II
MA 16.10: Vortrag
Mittwoch, 24. März 2010, 12:30–12:45, H23
Preparation and characterisation of regularly arranged MnAs nanoclusters and chains on (111)B-GaAs substrates — •Matthias T. Elm1, Shingo Ito2, Hans-Albrecht Krug von Nidda3, Shinjiroh Hara2, and Peter J. Klar1 — 11. Physikalisches Institut, Justus-Liebig University, Heinrich-Buff-Ring 16, 35392 Giessen — 2Research Center for Integrated Quantum Electronics, Hokkaido University, Sapporo, Japan — 3Experimentalphysik V, University of Augsburg
Ordered arrangements of ferromagnetic MnAs nanoclusters and cluster chains were obtained by selective-area MOVPE on pre-patterned (111)B-GaAs substrates. Using this new method it is possible to control the position, the size and the shape of the nanoclusters on the surface in the growth process, which offers interesting opportunities to tune the properties of individual nanoclusters and the interaction of the clusters with the carriers of the surrounding semiconducting matrix. Several cluster arrangements and cluster chains were grown consisting of nanoclusters with a length of 690 nm and a width of 290 nm. The quality of the cluster growth was investigated by SEM and AFM. The magnetic properties were probed by MFM and FMR in order determine the magnetic anisotropy and the domain formation 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 transport properties were correlated with the cluster arrangement of the samples and the magnetization orientation.