Regensburg 2025 – scientific programme
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 8: (Multi)ferroic States: From Fundamentals to Applications (III)
KFM 8.2: Talk
Tuesday, March 18, 2025, 10:00–10:15, H9
Exploring (110) epitaxial strain in ferroelectric films and superlattices — •Lan-Tien Hsu, Chien-Wen Hao, and Anna Grünebohm — Interdisciplinary Centre for Advanced Materials Simulation (ICAMS) and Center for Interface-Dominated High Performance Materials (ZGH), Ruhr-University Bochum, Universitätsstr. 150, 44801 Bochum, Germany
Epitaxial strain in low-symmetry orientations significantly influences the phase stability and polarization orientation of ferroelectric thin films and superlattices,[1] offering the potential for advanced nanoelectronic applications.[2] We explore the phase diagrams of (110)-oriented BaTiO3, KNbO3, and superlattice BaTiO3/SrTiO3 under strain and electric field using ab initio based coarse-grained molecular dynamics.[3] We reveal how the epitaxial (110) strain affects polarization, transition temperatures, and the emergence of topological features. Complex multidomain structures appear, particularly in superlattices due to depolarization fields.
[1] Das et al, Nature 568, 368-372 (2019)
[2] Grünebohm et al, J.Phys.:Condens.Matter 34, 073002 (2021)
[3] Nishimatsu et al, Phys. Rev. B 78, 104104 (2008)
Keywords: ferroelectric; epitaxial strain; superlattice; symmetry; domain structure