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SYSA: Symposium Synergistic Imaging Techniques: From Spins and Atoms to Ferroic Domains

SYSA 1: Synergistic Imaging Techniques: From Spins and Atoms to Ferroic Domains

SYSA 1.2: Invited Talk

Monday, March 18, 2024, 15:30–16:00, H 0105

Exploring ferroelectric domains and domain wall dynamics with quantitative STEM — •Marta D. Rossell — Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland

With increasing miniaturization, ferroelectric devices face a loss of their properties and major reliability issues hinder their commercialization. Overcoming these problems requires a deeper understanding of the microscopic mechanisms of domain wall motion, nucleation and the role of various types of defects, such as oxygen vacancies. A major challenge is thus the investigation of ferroelectric materials at the nanometer and atomic scale and under operando conditions. This has recently become feasible thanks to advances in aberration-corrected (scanning) transmission electron microscopy (S/TEM) and microelectromechanical (MEMS) technology for miniaturized TEM sample holders for in-situ heating and electrical biasing experiments. In this talk, I will show some recent results on how crystalline defects in various ferroelectric thin films can induce, for example, local polarization reversal, alter domain kinetics or even modify phase transition temperatures.

Keywords: ferroelectric thin films; scanning transmission electron microscopy; crystalline defects; phase transition temperature