Publications

Multistep stochastic mechanism of polarization reversal in rhombohedral ferroelectrics

Genenko, Y.A. and Khachaturyan, R. and Vorotiahin, I.S. and Schultheiß, J. and Daniels, J.E. and Grünebohm, A. and Koruza, J.

PHYSICAL REVIEW B
Volume: 102 Pages:
DOI: 10.1103/PhysRevB.102.064107
Published: 2020

Abstract
A stochastic model for the field-driven polarization reversal in rhombohedral ferroelectrics is developed, providing a description of their temporal electromechanical response. Application of the model to simultaneous measurements of polarization and strain kinetics in a rhombohedral Pb(Zr,Ti)O3 ceramic over a wide time window allows the identification of preferable switching paths, fractions of individual switching processes, and their activation fields. In conjunction, the phenomenological Landau-Ginzburg-Devonshire theory is used to analyze the impact of an external field and stress on switching barriers, showing that residual mechanical stress may promote the fast switching. © 2020 American Physical Society.

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