Berlin 2012 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 1: Focus Session: Conductive Domain Walls

DF 1.5: Hauptvortrag

Montag, 26. März 2012, 11:25–11:55, EB 107

Domain wall functionality in complex oxides — •Jan Seidel — Lawrence Berkeley National Laboratory, Berkeley CA 94720, USA

Interfaces and topological boundaries in complex oxide materials, such as domain walls, have recently received increasing attention due to the fact that their properties, which are linked to the inherent order parameters of the material, its structure and symmetry, can be completely different from that of the bulk material. I will present recent results on electronic and optical properties of ferroelectric domain walls in multiferroic BiFeO3 and ErMnO3. The origin and nature of the observed electrical conductivity at certain wall types is probed using a combination of conductive atomic force microscopy, high resolution transmission electron microscopy and first-principles density functional computations.