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Dresden 2017 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 11: Ferroics - Domains, Domain Walls and Skyrmions II

DF 11.5: Vortrag

Mittwoch, 22. März 2017, 11:00–11:15, WIL B321

Monoclinic superdomains in ferroelectric K0.7Na0.3NbO3 thin films on TbScO3 — •Leonard von Helden1, Martin Schmidbauer1, Dorothee Braun1, Christoph Feldt1, Michael Hanke2, and Jutta Schwarzkopf11Leibniz Institut für Kristallzüchtung, Max-Born-Str. 2, 12389 Berlin — 2Paul-Drude-Institut für Festkörperelektronik, Hausvogteipl. 5-7, 10117 Berlin

KxNa1−xNbO3 is a promising material for lead free ferro- and piezoelectric applications. Enhanced piezoelectric properties can be achieved by incorporating anisotropic lattice strain in epitaxial thin films. Monoclinic domains, which are favorable as they enable a continuous rotation of the polarization vector within the monoclinic mirror plane, were shown to be stabilized in K0.7Na0.3NbO3 thin films grown by MOCVD on TbScO3 substrates.[1]
In this study we present the coexistence of four variants of superdomains in (001)pc oriented K0.7Na0.3NbO3 films on TbScO3 with a film thickness of 30 nm. Below this thickness, only two types of superdomains occur. Each superdomain consists of periodically ordered stripe domains which are characterized by their vertical and lateral response in piezoresponse force micrographs (PFM) indicating different local piezoelectric coefficients. The domain structure can tentatively be described by monoclinically distorted unit cells, whose in-plane orientation is rotated by 90 between the stripe domains. A domain model is presented based on X-Ray diffraction experiments using a nano-focused beam.
[1] J. Schwarzkopf et al., J. Appl. Crys., 49, 375-384, (2016)

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