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O: Oberflächenphysik

O 6: Hauptvortrag

O 6.1: Hauptvortrag

Montag, 27. März 2000, 14:30–15:15, H36

Atomistic processes and the strain distribution in the early stages of thin film growth — •V.S. Stepanyuk¹, D.I. Bazhanov², W. Hergert¹, C. Massobrio³, P. Rennert¹, and P.H. Dederichs⁴ — ¹Fachbereich Physik, Martin-Luther-Universtät, Friedemann-Bach-Platz 6, D-06108 Halle — ²Max-Planck-Institute für Mikrostrukturphysik, Weinberg 2, 06120 Halle — ³Institut de Physique et de Chimie des Matériaux de Strasbourg, 23 rue du Loess F-67037 Strasbourg — ⁴Institut für Festkörperforschung, Forschungszentrum Jülich, D-52425 Jülich

Results of ab initio and semi-empirical studies of the energetics and strains of heterogeneous systems consisting of adatoms and small clusters on metal surfaces are presented. We concentrate on the Co/Cu(001) system. Intermixing on the surface and the cluster formation are investigated. The interaction of small Co clusters with their substrates leads to unexpected strain distribution in the surface. The strain in the surface region near islands vary strongly on an atomic scale. The effect of the size and the shape of clusters on the strain relief is discussed. The diffusion on the top of strained islands and the edge diffusion are considered.