Berlin 2012 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 1: Focus Session: Conductive Domain Walls

DF 1.2: Hauptvortrag

Montag, 26. März 2012, 10:00–10:30, EB 107

Charged Domain Walls and Their Impact on Properties of Ferroelectrics — •Alexander Tagantsev — Swiss Federal Institute of Technology

A ferroelectric domain wall can carry net bound charge depending on its orientation with respect to the direction of polarization in adjacent domains. The properties of such walls, called charged walls, can substantially differ from those of walls which carry no bound charge. An essential feature of this kind of walls is that, practically, they can exist only when their bound charge is nearly fully screened by free carriers in the material.

This paper is devoted to the theory of properties (structure, mobility, and conductivity) of charged ferroelectric domain walls and that of the impact of this kind of walls on the dielectric and piezoelectric properties of the material. Available experimental data will be discussed in the context of the theories presented.