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Imaging and Structure Analysis of Ferroelectric Domains, Domain Walls, and Vortices by Scanning Electron Diffraction by Ludacka, Ursula; He, Jiali; Qin, Shuyu; Zahn, Manuel; Christiansen, Emil Frang; Hunnestad, Kasper A.; Yan, Zewu; Bourret, Edith; Kézsmárki, István; van Helvoort, Antonius T. J.; Agar, Joshua; Meier, Dennis is a scholarly article available to read on EtoBox.

What is Imaging and Structure Analysis of Ferroelectric Domains, Domain Walls, and Vortices by Scanning Electron Diffraction about?

Direct electron detectors in scanning transmission electron microscopy give unprecedented possibilities for structure analysis at the nanoscale. In electronic and quantum materials, this new capability gives access to, for example, emergent chiral structures and symmetry-breaking distortions that underpin functional properties. Quantifying nanoscale structural features with statistical significance, however, is complicated by the subtleties of dynamic diffraction and coexisting contrast mechanisms, which often results in low signal-to-noise and the superposition of multiple signals that are challenging to deconvolute. Here we apply scanning electron diffraction to explore local polar distortions in the uniaxial ferroelectric Er(Mn,Ti)O$_3$. Using a custom-designed convolutional autoencoder with bespoke regularization, we demonstrate that subtle variations in the scattering signatures of ferroelectric domains, domain walls, and vortex textures can readily be disentangled with statistical significance and separated from extrinsic contributions due to, e.g., variations in specimen thickness or bending. The work demonstrates a pathway to quantitatively measure symmetry-breaking distort

Author

Ludacka, Ursula; He, Jiali; Qin, Shuyu; Zahn, Manuel; Christiansen, Emil Frang; Hunnestad, Kasper A.; Yan, Zewu; Bourret, Edith; Kézsmárki, István; van Helvoort, Antonius T. J.; Agar, Joshua; Meier, Dennis

Published

2023

Language

EN