Dresden 2026 – wissenschaftliches Programm
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FM: Fachverband Funktionsmaterialien
FM 23: Focus Session: (Anti)ferroic states – Magnetic and magnetoelectric III (joint session FM/MA)
FM 23.6: Vortrag
Freitag, 13. März 2026, 11:15–11:30, BEY/0E40
Time resolved X-ray diffraction study of polarization reversal in uniaxial ferroelectric BaMgF4 single crystals — •Nathan Leubner1,4, Sara Polo-Filisan2, Gaetano Bonetti2, Hiroki Tanaka2, Matthias Zschornak3, Dirk C. Meyer1, Carsten Richter2, and Semën Gorfman4 — 1Institut für Experimentelle Physik, TU Bergakademie Freiberg — 2Leibniz-Institut für Kristallzüchtung, Berlin — 3Fakultät Maschinenbau, HTW Dresden — 4Department of Materials Science and Engineering, Tel Aviv University, Israel
BaMgF4 (BMF) is a uniaxial ferroelectric material crystallizing in the orthorhombic space group Cmc21 and being a compelling candidate for frequency conversion in far ultraviolet regime. In this work, we present time-resolved X-ray diffraction (XRD) studies of single-crystalline BMF under applied electric fields, enabling direct observation of atomic-scale structural changes during domain switching. Complementary dielectric measurements provide insights into the kinetics of domain wall motion. The XRD data reveal the electric-field dependence of strain, allowing for the determination of the components of the piezoelectric tensor of BMF. Furthermore, by exploiting the resonant Friedel pair contrast between oppositely polarized domains, we achieve a direct determination of the crystal structure of each domain. This approach eliminates the need for conventional correction factors (e.g., absorption, extinction), offering a robust and accurate alternative to traditional structure refinement methods. Our findings advance the fundamental understanding of ferroelectric switching in BMF.
Keywords: ferroelectrics; x-ray diffraction; stroboscopic; BaMgF4