Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 70: Symposium Photons in Magnetism (SYPM, jointly with MA, HL, MI)

O 70.5: Hauptvortrag

Donnerstag, 14. März 2013, 17:00–17:30, H1

Every atom counts - Magnetic properties of supported metal atoms and small alloy clusters — Torben Beeck, Ivan Baev, Steffen Palutke, Kai Chen, Sören Meyer, Kari Jänkälä, Michael Martins, and •Wilfried Wurth — Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg

Investigation of supported metal atoms and small clusters with a well-defined number of atoms gives fundamental insights into the evolution of magnetic properties from single atoms to nanostructures. Experimental results can be compared to theoretical studies since the supported small clusters present tractable systems for sophisticated theoretical methods that explicitly include strong correlation effects. Experimentally the magnetic properties can be investigated using magnetic circular dichroism in resonant x-ray absorption (XMCD). XMCD at modern synchrotron radiation sources such as BESSY II in Berlin and PETRA III in Hamburg allows us - due to its element specificity - to investigate very dilute targets such as small particles with very few atoms even on a large background, i.e. in contact with a metal substrate. In the talk I will review results on single metal atoms as well as small alloy clusters with a defined number of atoms and composition in contact with a metal substrate which illustrate how the local properties such as spin and orbital magnetic moment strongly depend on the interaction within the cluster and with the substrate.

Support by the DFG through SFB 668 and by the BMBF through grant 05K10GU5 is gratefully acknowledged.