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MM: Fachverband Metall- und Materialphysik
MM 23: Topical Session: Interface-dominated phenomena - Interactions at Interfaces
MM 23.3: Vortrag
Dienstag, 17. März 2020, 12:15–12:30, IFW A
Directionality of metal-induced crystallization and layer exchange in amorphous carbon/nickel thin film stacks — •Matthias Krause1, Daniel Janke1, Frans Munnik1, Jaakko Julin1, René Hübner1, Jörg Grenzer1, Christina Wüstefeld2, David Rafaja2, and Sibylle Gemming1, 3 — 1Helmholtz-Zentrum Dresden- Rossendorf, 01328 Dresden, Germany — 2Institute of Materials Science, TU Bergakademie Freiberg, Gustav-Zeuner-Straße 5, 09599 Freiberg, Germany — 3Institute of Physics, TU Chemnitz, Reichenhainer Straße 70, 09126 Chemnitz, Germany
Metal-induced crystallization and layer exchange (LE) of amorphous carbon in thin film stacks with Ni were investigated as a function of the initial stacking order. Bilayer and triple layer stacks were exposed to heating ramps up to 700°C.
Turbostratic carbon formed during annealing. The degree of LE, quantified by ion beam analysis, is 95 % and 80 % for the outward and inward direction, respectively. Based on the calculation of surface and interface energies of the initial and final states, thermodynamic estimations pointed to the wetting of Ni grain boundaries by C atoms as the initial driving force for the LE and allowed a consistent understanding of the LE directionality and of the final thin film microstructure.