Regensburg 2007 – scientific programme

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O: Fachverband Oberflächenphysik

O 30: Nanostructures at Surfaces III (Dots, Particles, Clusters)

O 30.5: Talk

Tuesday, March 27, 2007, 16:45–17:00, H36

Selfassembled growth and magnetism of ordered arrays of nanometer size Co clusters — •Axel Enders, Jian Zhang, Violetta Sessi, Jan Honolka, and Klaus Kern — MPI für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart

In this talk we will show how spherical clusters of less than 3 nm diameter can be fabricated on substrates by buffer layer assisted growth, without the implications usually associated with epitaxy. The resulting clusters are randomly distributed over the bare substrate surface. However, the application of such clusters as individually addressable magnetic units requires their controlled arrangement into well-defined ordered arrays. We are therefore guiding the clusters with the morphology of periodic network structures prefabricated on the substrate. We use mechanically extremely stable boron nitride nanomeshes as template surfaces. We will demonstrate that ordered cluster layers with a filling factor of more than 75% are achieved by repeated cluster deposition cycles onto the nanomesh. We will discuss the magnetic properties of the cluster ensemble as well as the application of the mesh as reactor for the fabrication of ordered, binary alloy clusters.