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O: Fachverband Oberflächenphysik

O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)

O 42.117: Poster

Wednesday, March 25, 2009, 17:45–20:30, P2

Influence of supporting substrate on the shape of deposited size-selected nanoparticles — •Christian Kleinhans, Wolfgang Rosellen, Furkan Bulut, Kerstin Gebhardt, and Mathias Getzlaff — Institute of Applied Physics, University Düsseldorf

The structure of supported clusters, significantly affecting their electronic and magnetic properties, is of large interest in today’s physics, especially from a technological point of view for future applications. With a continuously working, UHV-compatible arc cluster ion source (ACIS), Fe-, Co- and FeCo-alloy-clusters have been produced and subsequently mass filtered using an electrostatic quadrupole-deflector-unit. The sizes range from 5 to 15nm. The deposition of these preformed free clusters onto a ferromagnetic Ni-thin-film prepared on a W(110)-substrate was performed under soft-landing conditions. For comparison, the clusters were additionally deposited on the bare W(110) surface. Due to the different surface energies, changes in the shape of the clusters are to be expected. The determination of size and shape of the nanoparticles was carried out by means of STM and TEM. We will also discuss the temperature dependence concerning the different nanoparticle-substrate sytems.