Berlin 2015 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 7: Focused Session on Ferroic Domain Walls II (DF with MA)
DF 7.2: Vortrag
Dienstag, 17. März 2015, 10:00–10:20, EB 107
Nonlinear characteristic of ferroelectric domains: From single domain wall to the periodic structure — •Kai Spychala1, Moritz Grothe1, Alex Widhalm1, Gerhard Berth1,2, and Artur Zrenner1,2 — 1Department Physik, Universität Paderborn, 33098 Paderborn, Germany — 2Center for Optoelectronics and Photonics Paderborn (CeOPP), 33098 Paderborn, Germany
On the way to smaller periods of periodically poled structures in ferroelectrica a comprehensive acknowledgement of the domain wall's nonlinear response is necessary. In this approach the analysis of the ferroelectric domain structures have been realized by means of second harmonic (SH) microscopy. In our study the nonlinear characteristic of an isolated transition between two contrarily poled ferroelectric domains has been determined. Here for the nonlinear sequence in the region of a single domain wall, a symmetric trend transverse to the domain transition was initially detected. A detailed depth-resolved and polarization-dependent study hints at a SH-signature conditioned by the orientation of the crystals. Additionally a functional dependence on depth of such sequences was observed. Here an influence of surface charge and inner electric field distribution can be assumed. Furthermore specific nonlinear signatures which are directly connected to the period of the do-main grating were detected in the system's nonlinear response. Due to the long-range character of the correlation between the domain boundaries, an assumed direct link with the inner electric field distribution is suggested.