Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 49: Metal Substrates: Structure, Epitaxy and Growth

O 49.1: Talk

Wednesday, March 18, 2015, 10:30–10:45, MA 042

Investigation of nanocluster formation far from equilibrium in heteroepitaxial system: Co/Cu(111) — •Quang Huy Vu, Sebastian Kunze, and Karina Morgenstern — Physical Chemistry I, Ruhr-Universiät Bochum, Universitätstr. 150,44801 Bochum, Germany

Lattice mismatch plays an important role in heteroepitaxial systems. Here we present such a system, Co adsorbed on Cu(111). Why is so important to study this system? The small lattice mismatch between cobalt and copper of 1.9% makes it attractive to investigate its structural characteristics and study its effect onto submonolayer adsorption. The growth mechanism of cobalt was measured by means of fast-scanning tunneling microscopy within the range of surface temperatures from 100 K to 300 K and for different deposition rates. At very low coverage, cobalt forms nanoclusters on Cu(111). These clusters adsorb favorably at step edges on Cu(111) at 115 K. In contrast at higher coverage, cobalt forms islands of fractal shapes with 1 ML height at 165K. Furthermore, the nucleation of 2 ML island height is studied at 165 K not only on the terraces but also on the step edges. Finally, the etching of Cu is observed at room temperature indicates growth of intermixed nanocluters. In this presentation the atomic processes of the island formation will be discussed