Dresden 2020 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 23: Topical Session: Interface-dominated phenomena - Interactions at Interfaces

MM 23.3: Talk

Tuesday, March 17, 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 Gemming^{1, 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.