Avalanche criticality during ferroelectric/ferroelastic switching

Casals, Blai and Nataf, Guillaume F. and Salje, Ekhard K. H. (2021) Avalanche criticality during ferroelectric/ferroelastic switching. Nature Communications, 12 (1). ISSN 2041-1723 DOI https://doi.org/10.1038/s41467-020-20477-6

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Official URL: https://doi.org/10.1038/s41467-020-20477-6

Abstract

Field induced domain wall displacements define ferroelectric/ferroelastic hysteresis loops, which are at the core of piezoelectric, magnetoelectric and memristive devices. These collective displacements are scale invariant jumps with avalanche characteristics. Here, we analyse the spatial distribution of avalanches in ferroelectrics with different domain and transformation patterns: Pb(Mg1/3Nb2/3)O3–PbTiO3 contains complex domains with needles and junction patterns, while BaTiO3 has parallel straight domains. Nevertheless, their avalanche characteristics are indistinguishable. The energies, areas and perimeters of the switched regions are power law distributed with exponents close to predicted mean field values. At the coercive field, the area exponent decreases, while the fractal dimension increases. This fine structure of the switching process has not been detected before and suggests that switching occurs via criticality at the coercive field with fundamentally different switching geometries at and near this critical point. We conjecture that the domain switching process in ferroelectrics is universal at the coercive field.

Item Type: Article
Uncontrolled Keywords: 2021AREP; IA77
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
07 - Gold Open Access
Journal or Publication Title: Nature Communications
Volume: 12
Identification Number: https://doi.org/10.1038/s41467-020-20477-6
Depositing User: Sarah Humbert
Date Deposited: 20 Jan 2021 01:39
Last Modified: 20 Jan 2021 01:39
URI: http://eprints.esc.cam.ac.uk/id/eprint/5996

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