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 TbMnO3Jonas Stein1, •Sebastian Biesenkamp1, Tobias Fröhlich1, Tobias Cronert1, Jeannis Leist2, A Agung Nugroho6, Ladislav Bohatý5, Petra Becker5, Navid Qureshi4, Karin Schmalzl3, Götz Eckold2, and Markus Braden11II. 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)

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