SKM 2023 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 1: Focus: Domains and Domainwalls in (Multi)Ferroics I

KFM 1.8: Vortrag

Montag, 27. März 2023, 11:55–12:15, POT 51

Tracing property-determining structural alterations via scanning electron diffraction — •Ursula Ludacka¹, Jiali He¹, Emil Frang Christiansen¹, Shuyu Qin², Manuel Zahn^1,6, Zewu Yan^3,4, Edith Bourret⁴, Antonius van Helvoort¹, Joshua Agar^2,5, and Dennis Meier¹ — ¹NTNU, Trondheim, Norway — ²Lehigh University, Bethlehem, USA — ³ETH Zurich, Zurich, Switzerland — ⁴Lawrence Berkeley National Laboratory, Berkeley, USA — ⁵Drexel University, PA, USA — ⁶Augsburg University, Germany

Ferroelectricity originates from polar displacements of lattice atoms, suggesting a one-to-one correlation between electronic and structural properties at the atomic level. Scanning electron diffraction (SED), a subcategory of 4D-STEM, in combination with direct electron detection (DED) is a powerful tool for probing functional properties on the atomic scale. We demonstrate the potential and opportunities of this innovative SED approach using improper ferroelectric ErMnO3, an ideal model system as its basic ferroelectric properties, such as local conductivity changes and atomic-scale structure are well understood. By utilizing a convolutional neural network on the SED dataset, we can deconvolve intrinsic scattering phenomena on the atomic level (ferroelectric domains and domain walls) from extrinsic scattering phenomena, such as thickness, bending, or scan distortions. Our results on this topic contain new insights into atomic scale property-structure relations for ferroelectrics. However, the gained knowledge is applicable to complex oxides in general.