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TZID:Europe/Paris
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BEGIN:VEVENT
UID:1-484@lptms.universite-paris-saclay.fr
DTSTART:20170124T110000Z
DTEND:20170124T120000Z
DTSTAMP:20170117T101336Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-laura-foini-2/
SUMMARY:Séminaire du LPTMS: Laura Foini - LPTMS\, salle 201\, 2ème étage
 \, Bât 100\, Campus d'Orsay - 24 Jan 17 11:00
DESCRIPTION:Spatio-temporal patterns in ultra-slow domain wall creep dynami
 cs\nLaura Foini (LPT-ENS\, Paris)\nIn presence of impurities\, ferromagnet
 ic and ferroelectric domain walls slide only above a finite external field
 . Close to this depinning threshold\, they proceed by large and abrupt jum
 ps\, called avalanches\, while\, at much smaller field\, these interfaces 
 creep by thermal activation.\nIn this talk I will present our results for 
 the creep dynamics at vey low forces\, obtained by a novel numerical tech
 nique that captures this ultra-slow regime over huge time scales. We point
  out the existence of activated events that involve collective reorganizat
 ions similar to avalanches\, but\, at variance with them\, display correla
 ted spatio-temporal patterns that resemble the complex sequence of aftersh
 ocks observed after a large earthquake. Remarkably\, we show that events a
 ssembly in independent clusters that display at large scales the same stat
 istics as critical depinning avalanches. We foresee this correlated dynami
 cs being experimentally accessible by magneto-optical imaging of ferromagn
 etic films.\n
CATEGORIES:seminars
LOCATION:LPTMS\, salle 201\, 2ème étage\, Bât 100\, Campus d'Orsay\, 15 
 Rue Georges Clemenceau\, Orsay\, 91405\, France
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