Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 16: Magnetic Particles and Clusters I
MA 16.9: Vortrag
Dienstag, 26. Februar 2008, 12:30–12:45, H 1028
Magnetic and structural properties of size-selected Fe50Co50-clusters on surfaces — •Furkan Bulut1, Wolfgang Rosellen1, Joachim Bansmann2, Armin Kleibert3, Karl-Heinz Meiwes-Broer2, Renate Kerstin Gebhardt1, and Mathias Getzlaff1 — 1Institut für Angewandte Physik, Universität Düsseldorf, 40225 Düsseldorf — 2Institut für Oberflächenchemie und Katalyse, Universität Ulm, 89069 Ulm — 3Institut für Physik, Universität Rostock, 18051 Rostock
Mass-filtered Fe50Co50-clusters were produced by a continuously working arc cluster ion source [1]. The diameter of these size selected clusters can be tuned between 6-12 nm. We could prove a crystalline structure and determine the stoichiometry of the corresponding nearly free alloy clusters by HRTEM and EDX, resp. The clusters were deposited on Ni/W(110) and W(110) surfaces. Element specific spin and orbital magnetic moments were investigated by XMCD. We also performed in-situ STM. We could show that the clusters being deposited under soft landing conditions exhibit no fragmentation. We have proved that the clusters have no preferential adsorption sites on W(110) and are irregularly distributed on the terraces. They are slightly flattened due to particle surface interactions [2, 3].
[1] A. Kleibert et al., J. Appl. Phys. 101, 114318 (2007)
[2] M. Getzlaff et al., Appl. Phys. A 82 (2006) 95
[3] R. K. Gebhardt et al., Eur. Phys. J. D (submitted)