Open Conference Systems, StatPhys 27 Main Conference

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Domain walls beyond the elastic approximation
Nirvana Belén Caballero, Thierry Giamarchi

##manager.scheduler.building##: Edificio Santa Maria
##manager.scheduler.room##: Auditorio San Agustin
Date: 2019-07-10 12:00 PM – 03:45 PM
Last modified: 2019-06-14

Abstract


Ferroics are special materials characterized by having regions (domains) with different electrical polarization or magnetization that lead to the existence of structures at the nanoscale in the form of domain walls. The high-speed manipulation of these nanoestructures is the prime factor for the development of the next generation of new and low-power functional devices for computation and communication. Controlling these nanoestructures is challenging since their behavior is governed by the competition between their elastic energy, temperature, and the varying potential landscape which allows pinning, leading to a characteristic roughening, and a complex dynamic response. Understanding the out-of-equilibrium physics of these systems, as well as the heterogeneous disorder landscape, are the key experimental and theoretical challenges in this field. New tools are needed to meet this challenge and describe the complex physics of domain walls.
By simulations of a Ginzburg-Landau model for ferroic systems, we explore how to treat features of domain walls usually ignored in the elastic approximation (such as overhangs, bubbles, plasticity). By a combination of analysis of different analytical and numerical results, we propose observables to study the geometry of domain walls. We examine in particular observables such as the roughness and the two-dimensional structure factor, both numerically and analytically. Our simulations, in addition to making contact with experiments, allow to test and provide insight to develop new analytical approaches to this problem.