Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 7: Focus Session: Defects and Interfaces in Multiferroics 2

KFM 7.1: Hauptvortrag

Montag, 5. September 2022, 15:00–15:30, H5

Multiferroic coupling on the level of domain walls — •Mads C. Weber^1,2, Yannik Zemp¹, Marcela Giraldo¹, Ehsan Hassanpour^1,3, Quintin Meier¹, Yusuke Tokunaga⁴, Yoshinori Tokura^4,5, Sang-Wook Cheong⁶, Nicola N. Spaldin¹, Thomas Lottermoser¹, and Manfred Fiebig¹ — ¹ETH Zurich — ²Le Mans University — ³University of Bern — ⁴University of Tokyo — ⁵RIKEN — ⁶Rutgers University

Multiferroic materials are of interest for the coupling of different ferroic properties on the level of the domains. However, this coupling is not only limited to the bulk but concerns the domain walls too. Here, we show on the example of three different multiferroic systems, that the multi order-parameter coupling on the domain wall level leads to a wide variety of intrinsic domain wall phenomena. In (Dy,Tb)FeO₃, we demonstrate that the interaction of two independent magnetic sublattices gives rise to a polar, multiferroic domain wall in a non-multiferroic environment. The crosstalk of ferroelectricity, structural distortions and magnetic order in hex-ReMnO₃ leads to spin rotations of 60^∘, 120^∘ or 180^∘ about the magnetic domain walls. Depending on the position of the magnetic domain walls with respect of the ferroelectric domain walls, these walls can exchange their rotational character. In the last example, we show that the interplay of two structural distortions in hybrid improper ferroelectrics induces head-to-head and tail-to-tail orientations of the polarization of adjacent ferroelectric domains. These examples illustrate the wide variety of domain wall phenomena thanks to (multi)ferroic coupling effects on the nanoscale.