Séminaire du LPTMS: Laura Foini
Spatio-temporal patterns in ultra-slow domain wall creep dynamics
Laura Foini (LPT-ENS, Paris)
In presence of impurities, ferromagnetic and ferroelectric domain walls slide only above a finite external field. Close to this depinning threshold, they proceed by large and abrupt jumps, called avalanches, while, at much smaller field, these interfaces creep by thermal activation.
In this talk I will present our results for the creep dynamics at vey low forces, obtained by a novel numerical technique that captures this ultra-slow regime over huge time scales. We point out the existence of activated events that involve collective reorganizations similar to avalanches, but, at variance with them, display correlated spatio-temporal patterns that resemble the complex sequence of aftershocks observed after a large earthquake. Remarkably, we show that events assembly in independent clusters that display at large scales the same statistics as critical depinning avalanches. We foresee this correlated dynamics being experimentally accessible by magneto-optical imaging of ferromagnetic films.
Date/Time : 24/01/2017 - 11:00 - 12:00
Location : LPTMS, salle 201, 2ème étage, Bât 100, Campus d'Orsay
Upcoming seminars
- Séminaire du LPTMS : Giulia Pisegna (University of Rome La Sapienza) - 4 Mai 2021 - 11:00
- Séminaire du LPTMS : Antoine Fruleux (Ecole Polytechnique) - 11 Mai 2021 - 11:00
- Séminaire du LPTMS : Orazio Scarlatella (Collège de France) - 18 Mai 2021 - 11:00
- Séminaire du LPTMS : Marko Medenjak (LPENS) - 25 Mai 2021 - 11:00
- Séminaire du LPTMS : Samjay Ramassamy (IPHT) - 1 Juin 2021 - 11:00