Ultrafast Switching in Avalanche-Driven Ferroelectrics by Supersonic Kink Movements

Ekhard K.H. Salje, Xiaofei Wang, Xiangdong Ding, James F. Scott

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Article number1700367
JournalAdvanced Functional Materials
Volume27
Issue number21
DOIs
StatePublished - Jun 6 2017

Keywords

  • acoustic emission
  • avalanche formation
  • cracking noise
  • ferroelastic walls
  • ferroelectric switching
  • kinks
  • supersonic wall movements

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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