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The discovery of ferroelectricity in AlScN allowed the first clearobservation of the effect in the wurtzite crystal structure, resulting in amaterial with a previously unprecedented combination of very large coercivefields (2-5 MV/cm) and remnant polarizations (70-110 ${\mu}$C/cm$^2$). Weobtained initial insight into the switching dynamics of AlScN, which suggests adomain wall motion limited process progressing from the electrode interfaces.Further, imprint was generally observed in AlScN films and can tentatively betraced to the alignment of charged defects with the internal and externalpolarization and field, respectively. Potentially crucial from the applicationpoint of view, ferroelectricity could be observed in films with thicknessesbelow 30 nm - as the coercive fields of AlScN were found to be largelyindependent of thickness between 600 nm and 27 nm.

Ferroelectricity in AlScN: Switching, Imprint and sub-150 nm Films