SKM 2023 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 11: Crystal Structure Defects / Real Structure / Microstructure

KFM 11.2: Vortrag

Donnerstag, 30. März 2023, 14:20–14:40, POT 51

Determining the Crystallization Mechanism in Optical Switching Experiments with Electron Backscatter Diffraction — •Maximilian Müller and Matthias Wuttig — I. Institute of Physics (IA), Aachen, Germany

To tailor phase-change materials for computing and data storage applications unraveling the contribution of nucleation and crystal growth to crystallization is essential. Usually, these processes are studied at low temperatures. Subsequently, from the temperature dependence of both processes at low temperature, the role of these processes at high temperatures is extrapolated. This is inherently dangerous if the underlying processes do not follow Boltzmann kinetics.

In this study, crystallization was achieved by short laser pulses with pulse lengths between a few ns to several *s. Afterwards, the resulting grain structure was analyzed by different techniques, including atomic force microscopy and Electron BackScatter Diffraction (EBSD). The grain size distribution is determined by these experiments which helps disentangling the processes of nucleation and growth. Significant differences are observed concerning the nucleation of different compounds. Trends for the nucleation and growth rate as a function of stoichiometry are analyzed and explained based upon systematic changes in bonding.