Dresden 2003 – wissenschaftliches Programm

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O: Oberflächenphysik

O 22: Epitaxie und Wachstum I

O 22.8: Vortrag

Dienstag, 25. März 2003, 16:45–17:00, FOE/ORG

Stress and growth of Ag monolayers on a Fe(100) whisker — •Dirk Sander, R. Mahesh, S. M. Zharkov, and J. Kirschner — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle

In-situ stress measurements have been performed during the deposition of Ag monolayers on a Fe whisker. A compressive stress of −0.6 GPa is measured above 5 monolayer Ag thickness which is ascribed to the epitaxial misfit of −0.8 % between Ag and Fe. Back-extrapolation of the coverage dependent stress measurements to zero coverage reveals an Ag-induced change of surface stress of Fe(100) of −1.23 N/m. Comparing this surface stress change with the calculated surface stress for Ag(100) suggests a tensile surface stress of +2.05 N/m for clean Fe(100). The deposition of 2–5 layers Ag does not change the stress induced by the first layer significantly. This almost stress free growth is assigned to a rougher surface morphology which is most likely caused by a surface alloy formation.