Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 12: Symposium: Size-Selected Clusters at Surfaces I
(Invited Speakers: Karl-Heinz Meiwes-Broer, Heinz Hövel, Thorsten Bernhardt)
O 12.1: Hauptvortrag (ohne Erstattung)
Montag, 25. Februar 2008, 13:30–14:00, MA 005
Charge transport and magnetism of deposited clusters — •Karl-Heinz Meiwes-Broer1, Ingo Barke1, Armin Kleibert1, Viola von Oyenhausen1, Joachim Bansmann2, Kristian Sell1, Stefan Polei1, and Norman Wilken1 — 1Institut für Physik, Universität Rostock, Universitätsplatz 3, D-18051 Rostock, Germany — 2Abteilung Oberflächenchemie und Katalyse, Universität Ulm, Albert-Einstein-Allee 47, D-89069 Ulm, Germany
Magnetism and electronic properties of clusters at surfaces are of wide interest as is documented by the current Priority Programme of the Deutsche Forschungsgemeinschaft (DFG-Schwerpunktprogramm 1153) [1]. In particular, the novel physics found on the nm-scale might lead to interesting novel objects for future applications. In this contribution 3 to 15 nm mass-filtered metal clusters are studied deposited from an ACIS source onto ultraclean solid surfaces. In the case of alloy clusters, the particles stoichiometry could independently be clarified by EDX and X-ray absorption spectroscopy, typically yielding a composition close to the target material. Low-temperature STS serves for the investigation of electronic properties. The resulting dI/dU curves are distinctly structured which results from the size-dependent density of states of the clusters as well as from the underlying substrate. Magnetic properties are interrogated with x-ray absorption (XMCD) measurements. Strongly size and substrate dependent magnetic orbital moments are found [2].
[1] Special issue on clusters at surfaces in Appl. Phys. A 82(1), 2006
[2] A. Kleibert et al., J. Appl. Phys. 101, 114318, 2007