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DS: Fachverband Dünne Schichten

DS 3: Metal Layers and Multilayers

DS 3.1: Talk

Monday, March 26, 2007, 09:30–09:45, H34

High Kinetic Energy Photoelectron Spectroscopy on Metal Heterostructures — •Mihaela Gorgoi¹, Olof Karis², Svante Svensson^1,2, Gunnar Öhrwall², Gabriella Andersson², Moreno Marcellini², Franz Schäfers¹, Walter Braun¹, and Wolfgang Eberhardt¹ — ¹BESSY GmbH, Albert-Einstein-Str. 15, 12489 Berlin, Germany — ²Department of Physics, Uppsala University, PO Box 530 SE 751 21 Uppsala, Sweden

In the present work, results on different Cu/Ni heterostructures studied by high kinetic energy photoelectron spectroscopy are presented. Core level shifts are found as a function of the Cu layer thickness within the multilayer structure as well as a function of the interface type between the copper and nickel. While the thickness of the Ni layer was fixed at 5 ML, the thickness of the Cu layer varied. Three samples are studied for Cu thicknesses of 2 ML, 4 ML and 5 ML. The measured core level shifts are found to confirm theoretical calculations of these systems [1, 2]. We have been able to study the destruction of the layered structures from the core photoelectron chemical shifts. Thus we have developed a new non destructive tool to study the quality of deeply buried interfaces. This study may therefore have considerable technical and commercial applicability.

[1] W. Olovsson, E. Holmström, J. Wills, P. James, I.A. Abrikosov, A.M.N. Niklasson, Phys. Rev. B 72 (2005) 155419; [2] W. Olovsson, E. Holmström, I.A. Abrikosov, A.M.N. Niklasson, M. Gorgoi, O. Karis, S. Svensson, G. Öhrwall, G. Anderson, M. Marcellini, W. Braun, W. Eberhardt, accepted Phys. Rev. Lett.