Avalanches from charged domain wall motion in BaTiO3 during ferroelectric switching

Casals, Blai and Nataf, Guillaume F. and Pesquera, David and Salje, Ekhard K. H. (2020) Avalanches from charged domain wall motion in BaTiO3 during ferroelectric switching. APL Materials, 8 (1). 011105. ISSN 2166-532X DOI https://doi.org/10.1063/1.5128892

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We report two methods for direct observations of avalanches in ferroelectric materials during the motion of domain walls. In the first method, we use optical imaging techniques to derive changes in domain structures under an electric field. All changes occur through small jumps (jerks) that obey avalanche statistics. In the second method, we analyze jerks by their displacement current. Both methods reveal a power law distribution with an energy exponent of 1.6, in agreement with previous acoustic emission measurements, and integrated mean field theory. This new combination of methods allows us to probe both polarization and strain variations during the motion of domain walls and can be used for a much wider class of ferroelectrics, including ceramic samples, than acoustic emission.

Item Type: Article
Uncontrolled Keywords: 2019AREP; IA76
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
07 - Gold Open Access
Journal or Publication Title: APL Materials
Volume: 8
Page Range: 011105
Identification Number: https://doi.org/10.1063/1.5128892
Depositing User: Sarah Humbert
Date Deposited: 24 Jan 2020 11:18
Last Modified: 24 Jan 2020 11:18
URI: http://eprints.esc.cam.ac.uk/id/eprint/4611

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