Dresden 2017 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 18: Multiferroics (DF and MA)

DF 18.8: Talk

Thursday, March 23, 2017, 17:00–17:15, WIL B321

Simulation and investigation of polarization kinetics in polycrystalline ferroelectrics. — •Ruben Khachaturyan — Technische Universität Darmstadt, Department of Materials Modeling, 64295 Darmstadt, Stephanstr. 5

The understanding of polarization dynamics over a wide time scale plays a crucial role in a vast range of applications, from non-volatile memories (FeRAM) and sensors to fuel injection applications.

It was established that polarization process under applied voltage develops simultaneously in different parts of a material with different switching times [1]. As switching time is strongly field dependent [2] it was suggested that local switching time distribution is caused by local electrical field distribution [3-5].

There is currently no statistical concept that accounts for spatial correlations of local polarizations and fields during polarization switching in a ferroelectric polycrystalline material.

The main purpose of the work is to simulate dynamics of polarization switching in a polycrystalline material under applied electric field. The data extracted from the simulations, such as field and polarization distributions and their correlations at different times, provide necessary information to study influence of the local field distribution on local switching processes.