Berlin 2024 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 3: Focus Session: (Multi-)Ferroic States I

KFM 3.4: Vortrag

Montag, 18. März 2024, 10:30–10:50, EMH 225

Reversible domain wall displacement in ferroelectric ErMnO₃ — •Manuel Zahn^1,2, Kyle Kelley³, Aaron M. Müller⁴, Sabine M. Neumeyer³, Thomas Lottermoser⁴, Sergei V. Kalinin⁵, Neus Domingo³, István Kézsmárki¹, Dennis Meier², and Jan Schultheiß² — ¹University of Augsburg, Augsburg, Germany — ²Norwegian University of Science and Technology (NTNU), Trondheim, Norway — ³Oak Ridge National Laboratory, Oak Ridge, USA — ⁴ETH Zurich, Zurich, Switzerland — ⁵University of Tennessee, Knoxville, USA

Many of the intriguing characteristics of ferroelectric materials arise from the physical responses at the level of the domains. In conventional ferroelectric systems, such as like Pb(Zr,Ti)O₃, BaTiO₃, and LiNbO₃, polarization reversal between monodomain states takes place through a nucelation and growth process. Different from these systems, hexagonal manganites (RMnO₃, R = Sc, Y, In, and Dy-Lu) host topological meeting points of domain walls that cannot be erased, giving rise to a fundamentally different switching behavior. Here, we explore the confined switching dynamics of ferroelectric domains in ErMnO₃, using band-excitation piezoresponse force microscopy (BE-PFM). Our measurements reveal reversible local displacement of ferroelectric walls induced by the electric field. Interestingly, we observe a continuous breathing-like mode of the domains when cycling the electric field. Our study provides new insights into the dynamics of the topologically protected domains and expands previous switching studies towards the domain level.