@article{4d374552212b4870869c97d051ab0de5,
title = "Temperature dependence of three-dimensional domain wall arrangement in ferroelectric K0.9Na0.1NbO3epitaxial thin films",
abstract = "The three-dimensional arrangement and orientation of domain walls in ferroelectric K0.9Na0.1NbO3/(110)NdScO3 epitaxial thin films were investigated at different temperatures both experimentally by means of piezoresponse force microscopy and three-dimensional x-ray diffraction and theoretically by three-dimensional phase-field simulations. At room temperature, a well-ordered herringbone-like domain pattern appears in which there is a periodic arrangement of a1a2/MC monoclinic phases. Four different types of domain walls are observed, which can be characterized by out-of-plane tilt angles of ±45° and in-plane twist angles of ±21°. For the orthorhombic high-temperature phase, a periodic a1/a2 stripe domain pattern with exclusive in-plane polarization is formed. Here, two different types of domain walls are observed, both of them having a fixed out-of-plane domain wall angle of 90° but distinguished by different in-plane twist angles of ±45°. The experimental results are fully consistent with three-dimensional phase-field simulations using anisotropic misfit strains. The qualitative agreement between the experiment and the theory applies, in particular, to the wide phase transition range between about 180 °C and 260 °C. In this temperature range, a complex interplay of coexisting monoclinic a1a2/MC and orthorhombic a1/a2 phases takes place.",
author = "Martin Schmidbauer and Laura Bogula and Bo Wang and Michael Hanke and {Von Helden}, Leonard and Adriana Ladera and Wang, {Jian Jun} and Chen, {Long Qing} and Jutta Schwarzkopf",
note = "Funding Information: We would like to thank DESY Hamburg for providing beam time at the stations P08 (Proposal No. I-20180675). We are especially grateful to Florian Bertram for technical support during the x-ray diffraction experiments and to Michaela Klann for sample growth. The NdScO3 substrates were grown at Leibniz-Institut f{\"u}r Kristallz{\"u}chtung in the group of Steffen Ganschow. B.W. and L.-Q.C. acknowledge support by the National Science Foundation (NSF) through Grant No. DMR-1744213. A.L. acknowledges funding from the Materials Research Science and Engineering Center (MRSEC) of the Pennsylvania State University, supported by the NSF under Grant. No. DMR-1420620. We also thank EFRE (Project No. 1.8/15) and DFG (Project No. FE 1438/ 2-1) for funding this project. We would like to thank Matthias Bickermann for a critical reading of the manuscript. The computer simulations were performed using the commercial software package μ-PRO (http://mupro.co/contact/) on the ICS-ACI Computing Systems at Pennsylvania State University and at the Extreme Science and Engineering Discovery Environment cluster, which used the Comet system at the UC San Diego. Publisher Copyright: {\textcopyright} 2020 Author(s).",
year = "2020",
month = nov,
day = "14",
doi = "10.1063/5.0029167",
language = "English (US)",
volume = "128",
journal = "Journal of Applied Physics",
issn = "0021-8979",
publisher = "American Institute of Physics Publising LLC",
number = "18",
}