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Dresden 2020 – wissenschaftliches Programm

Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 15: Postersession KFM

KFM 15.16: Poster

Donnerstag, 19. März 2020, 16:00–18:30, P2/1OG

Mapping of Conductivity at Ferroelectric Domain Walls using Alternating Voltages — •Jan Schultheiß1, Erik Lysne1, Jakob Schaab2, Edith Bourret3, Zewu Yan3,2, Stephan Krohns4, Donald M. Evans1, and Dennis Meier11Department of Materials Science and Engineering, NTNU Trondheim, Norway — 2Department of Materials, ETH Zurich, Switzerland — 3Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA — 4Experimental Physics V, University of Augsburg, Germany

Ferroelectric domain walls (DWs) are natural interfaces that separate domains with different orientation of the electric polarization. Using conductive atomic force microscopy (cAFM), it was found that DWs can exhibit completely different electronic conduction properties than the bulk domains. The characterization of the intrinsic transport behavior, however, remains a challenging task as conventional cAFM is inherently susceptible to contributions from contact resistance.
Here, we study the electrical conduction at ferroelectric domain walls under alternating voltages (a.c.) in the frequency range 0.2-20 MHz. We compare spatially resolved current maps with standard d.c. cAFM and highlight differences for different types of DWs in a hexagonal manganate (ErMnO3). We find that domain- and DW-related conduction contrasts drop at distinctly different frequencies, correlating with the polarization configuration at the DWs. Quantification of the characteristic frequencies provides new insight into the intrinsic transport mechanism at functional DWs.

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