Regensburg 2025 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 8: (Multi)ferroic States: From Fundamentals to Applications (III)

KFM 8.2: Vortrag

Dienstag, 18. März 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