Ultrafast Switching in Avalanche-Driven Ferroelectrics by Supersonic Kink Movements

Salje, Ekhard K. H. and Wang, Xiaofei and Ding, Xiangdong and Scott, James F. (2017) Ultrafast Switching in Avalanche-Driven Ferroelectrics by Supersonic Kink Movements. Advanced Functional Materials. ISSN 1616301X DOI 10.1002/adfm.201700367 (In Press)

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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.

Item Type: Article
Uncontrolled Keywords: 2017AREP; IA72;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
08 - Green Open Access
Journal or Publication Title: Advanced Functional Materials
Identification Number: 10.1002/adfm.201700367
Depositing User: Sarah Humbert
Date Deposited: 22 May 2017 10:13
Last Modified: 19 Jun 2017 09:31
URI: http://eprints.esc.cam.ac.uk/id/eprint/3969

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