Regensburg 2007 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 38: Diffusion and point defects III
MM 38.1: Vortrag
Donnerstag, 29. März 2007, 14:45–15:00, H6
Diffusion of Fe in intermetallic thin films — •Marcus Rennhofer1, Daniel Kmiec1, Bogdan Sepiol1, Gero Vogl1, André Vantomme2, Johan Meersschaut2, Bart Laenens2, Daniel Merkel3, Laszlo Bottyan3, Svetoslav Stankov4, and Rudolf Rüffer4 — 1Fakultät für Physik, Universität Wien — 2Instituut voor Kern- en Stralingsfysica and INPAC, K.U.Leuven — 3KFKI, Department of Nuclear Physics, Budapest — 4ESRF, Grenoble, Cedex, France
Diffusion studies on the mesoscopic and macroscopic scale were done up to now via radio-tracer technique for a wide range of diffusivities. Nevertheless, the resolution of diffusion depths is limited by the detector efficiencies and sputtering resolving power. On the other hand scattering methods with atomic resolution [1] have very limited range of accessible diffusion coefficients. We advantageously applied grazing incidence nuclear resonant scattering of synchrotron radiation [2] for the study of iron self-diffusion in thin intermetallic films of L10-FePt, L10-FePd and B2-FeSi. It is possible to measure very low rates of diffusion of about 10−21 m2s−1 to 10−25 m2s−1. We will give a short introduction to the method, and present recent results.
[1] G. Vogl and B. Sepiol, eds. Heitjans and Kärger Diffusion in condensed matter, Springer, p 65 (2005).
[2] M. Gupta, A. Gupta, J. Stahn, M. Horisberger, T. Gutberlet and P. Allenspach in Phys. Rev. B 70, 184206 (2004).