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)