Berlin 2018 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 25: Ferroics and Multiferroics (joint session KFM/TT/MA)

KFM 25.5: Vortrag

Donnerstag, 15. März 2018, 10:50–11:10, EMH 225

Domains Properties in Thin Ferroelectric Films Related to Surface Screening, Flexoelectric and Vegard Effects — •Ivan S. Vorotiahin^1,2, Anna N. Morozovska², Eugene A. Eliseev³, Sergei V. Kalinin⁴, Qian Li⁴, Yevhen M. Fomichov^3,5, and Yuri A. Genenko¹ — ¹Institut für Materialwissenschaft, Technische Universität Darmstadt, Darmstadt, Germany — ²Institute of Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine — ³Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kyiv, Ukraine — ⁴The Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, USA — ⁵Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic

Ferroelectric domains is a topic of undying interest in the research community, since their properties and formation conditions still remain not fully understood. Among those conditions, surface screening charges, flexoelectric effect and chemical stresses can be named. Their influence is well observable in films of several to several tens of nanometres thicknesses, i.e. in the forefront of the phenomenological theories.

A series of modelling experiments has been performed to predict the effects that those physical qualities can make on a shape of ferroelectric domains in the most well-known perovskite materials, as well as their impact on the electromechanical properties, phase diagrams, and field distributions. Their influence has been numerically and analytically estimated to provide a roadmap for future measurements and compared with each other to obtain a stronger understanding of the physical processes occurring in perovskites.