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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 3: Focus Session: (Multi-)Ferroic States I
KFM 3.1: Vortrag
Montag, 18. März 2024, 09:30–09:50, EMH 225
Domain Size Engineering by Grain Scaling in Polycrystalline Hexagonal DyMnO3 — •Ruben Dragland, Katharina Wolk, Elvia Chavez Panduro, Kasper Aas Hunnestad, Jan Schultheiss, and Dennis Meier — Norwegian University of Science and Technology (NTNU), Trondheim, Norway
Controlling the density and distribution of ferroelectric domain walls is essential for the development of domain wall electronics,
giving intriguing opportunities for continued downscaling of active electronic components.
The microstructure is a vital parameter for domain engineering,
and a proportional relation between grain and domain size is established.
However, inversely proportional domain scaling has been observed in ErMnO3, while domain-microstucture relations in other polycrystalline systems of the hexagonal manganite family remains to be explored.
Here, the domain structure in a hexagonal DyMnO3 polycrystal is investigated, exhibiting a non-uniform grain size distribution which is attributed to the material’s propensity to crystallize in the orthorhombic phase.
By systematically quantifying the domain sizes during post-processing, inverted scaling of domain size with grain size is observed, identifying the inverse scaling as an intrinsic phenomenon, effectively ruling out processing and heat treatment as the main origin.
The observed impact of non-uniform grain sizes on the domain structure is of interest to understand the complex nanoscale domain physics in ferroelectric polycrystals, and reveals new opportunities for tuning their macroscopic response towards broader time scales.
Keywords: Ferroelectrics; Domain Engineering; Domain Wall Electronics; Hexagonal Manganites; Piezoresponse Force Microscopy