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Ultrafast switching in avalanche-driven ferroelectrics by supersonic kink movements

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Date
06/06/2017
Author
Salje, Ekhard K. H.
Wang, Xiaofei
Ding, Xiangdong
Scott, James F.
Keywords
Acoustic emission
Avalanche formation
Cracking noise
Ferroelectric switching
Ferroelastic walls
Kinks
Supersonic wall movements
QC Physics
QD Chemistry
NDAS
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Abstract
Devices operating at GHz frequencies can be based on ferroelectric kink-domains moving at supersonic speed. The kinks are located inside ferroelastic twin boundaries and are extremely mobile. Computer simulation shows that strong forcing generates velocities well above the speed of sound. Kinks are accelerated from v = 0 continuously with Döring masses in the order of skyrmion masses under constant strain rates. Moving kinks emit phonons at all velocities, and the emission cones coincide with the Mach cones at supersonic speed. Kinks form avalanches with the emission of secondary kinks via a mother–daughter nucleation mechanism and may be observable in acoustic emission experiments. Supersonic kinks define a new type of material; while mobile domains are the key for ferroelastic and ferroelectric device applications at low frequencies, it is expected that fast kink movements replace such domain movements for materials applications at high frequencies.
Citation
Salje , E K H , Wang , X , Ding , X & Scott , J F 2017 , ' Ultrafast switching in avalanche-driven ferroelectrics by supersonic kink movements ' , Advanced Functional Materials , vol. 27 , no. 21 , 1700367 . https://doi.org/10.1002/adfm.201700367
Publication
Advanced Functional Materials
Status
Peer reviewed
DOI
https://doi.org/10.1002/adfm.201700367
ISSN
1616-3028
Type
Journal article
Rights
Copyright © 2017, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1002/adfm.201700367
Description
The authors appreciate the support of the Natural Science Foundation of China (51320105014, 51621063, and 51231008) and 111 project (B06025). E.K.H.S. is also grateful to the Engineering and Physical Sciences Research Council (EP/K009702/1) and the Leverhulme Foundation (RPG-2012-564) for support.
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  • University of St Andrews Research
URL
http://onlinelibrary.wiley.com/doi/10.1002/adfm.201700367/full#footer-support-info
URI
http://hdl.handle.net/10023/13065

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