Dresden 2017 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 9: Poster Session
DF 9.19: Poster
Dienstag, 21. März 2017, 14:00–16:00, P1C
Real-time observations of ferroelectric switching by ultrafast x-ray diffraction — •Christelle Kwamen2, Matthias Reinhardt2, Wolfram Leitenberger1, Matthias Roessle1, Flavio Zamponi1, Marin Alexe3, and Matias Bargheer1,2 — 1Institut für Physik und Astronomie, Uni Potsdam — 2Helmholtz-Zentrum Berlin — 3Department of Physics, University of Warwick
We present time-resolved x-ray diffraction experiments on the ferroelectric switching of Lead-Titanate films with a thickness of 150 nm.
The Bragg peak position directly measures the piezoelectric strain during the switching process, while the peak width derived from reciprocal space maps yields a detailed picture of the domain wall propagation dynamics. The scattering intensity yields the structure factor of the unit cells, which is a direct measure of the poling process.
We discuss how the switching speed can be increased from nanosecond to several picoseconds.