Creep motion of elastic interfaces driven in a disordered landscape

E E Ferrero (1) , L Foini (2) , T Giamarchi (3) , A B Kolton (1) , A Rosso (4)

1 Centro Atómico Bariloche [Argentine]
2 IPHT - Institut de Physique Théorique - UMR CNRS 3681
3 UNIGE - Université de Genève = University of Geneva
4 LPTMS - Laboratoire de Physique Théorique et Modèles Statistiques

The thermally activated creep motion of an elastic interface weakly driven on a disordered landscape is one of the best examples of glassy universal dynamics. Its understanding has evolved over the last 30 years thanks to a fruitful interplay between elegant scaling arguments, sophisticated analytical calculations, efficient optimization algorithms and creative experiments. In this article, starting from the pioneer arguments , we review the main theoretical and experimental results that lead to the current physical picture of the creep regime. In particular, we discuss recent works unveiling the collective nature of such ultra-slow motion in terms of elementary activated events. We show that these events control the mean velocity of the interface and cluster into "creep avalanches" statistically similar to the deterministic avalanches observed at the depinning critical threshold. The associated spatio-temporal patterns of activated events have been recently observed in experiments with magnetic domain walls. The emergent physical picture is expected to be relevant for a large family of disordered systems presenting thermally activated dynamics.

Keywords: creep; domain walls; depinning; disordered elastic systems; avalanches; activated motion

Domains: Physics [physics]

E E Ferrero, L Foini, T Giamarchi, A B Kolton, A Rosso. Creep motion of elastic interfaces driven in a disordered landscape. 2020. ⟨cea-02524847⟩