Dresden 2017 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 9: Poster Session

DF 9.25: Poster

Dienstag, 21. März 2017, 14:00–16:00, P1C

Time-resolved analysis of multiferroic switching in Ni₃V₂O₈, MnWO₄, DyMnO₃, and TbMnO₃ — Jonas Stein¹, •Sebastian Biesenkamp¹, Tobias Fröhlich¹, Tobias Cronert¹, Jeannis Leist², A Agung Nugroho⁶, Ladislav Bohatý⁵, Petra Becker⁵, Navid Qureshi⁴, Karin Schmalzl³, Götz Eckold², and Markus Braden¹ — ¹II. Physikalisches Institut, Universität zu Köln — ²Institut für Physikalische Chemie, Universität Göttingen — ³JCNS at ILL, France — ⁴ILL Grenoble, France — ⁵Kristallographie, Universität zu Köln — ⁶Institut Teknologi Bandung, Indonesia

We control multiferroic domains with electric fields in the order of several kV/mm to investigate the rise time in dependency of temperature and field strength and analyze the spatial extend and the dynamics of the chiral domains in the multiferroic phase and in vicinity of the multiferroic transition. Polarized neutrons are the ideal tool to investigate the multiferroic domains and complete the dielectric data. With our time-resolved setup it is possible to follow the reversion of chiral domains in the timescale of a few hundred microseconds to hours and record full Bragg scans for peak profile analysis in the time domain. In TbMnO₃ we find a clear logarithmic relation between the rise time and temperature that is fulfilled over 5 orders of magnitude. In DyMnO₃ the multiferroic switching is slowed down by Mn-Dy coupling.
Niermann et al. PRB 89, 134412 (2014) [2] Baum et al. PRB 89, 144406 (2014) [3] Holbein et al. PRB 91, 014432 (2015) [4] Stein et al. JPC 27, 446001 (2015)