Comptes Rendus
no. 8
Universal magnetic domain wall dynamics in the presence of weak disorder
[Universalité de la dynamique dʼune paroi de domaine magnétique en présence dʼun faible désordre]
Jacques Ferré1  ; Peter J. Metaxas2  ; Alexandra Mougin1  ; Jean-Pierre Jamet1  ; Jon Gorchon1  ; Vincent Jeudy1, 3
1 Laboratoire de physique des solides, UMR CNRS 8502, Université Paris-Sud, 91405 Orsay, France
2 School of Physics, M013, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
3 Université de Cergy-Pontoise, 95000 Cergy-Pontoise, France
Comptes Rendus. Physique, Volume 14 (2013) no. 8, pp. 651-666.

Le déplacement dʼinterfaces élastiques dans un milieu désordonné est un sujet qui sʼapplique à de nombreuses branches de la physique. Le mouvement dʼune paroi magnétique dans un film de Pt/Co/Pt ultra-mince a pu être interprété dans le cadre de théories sur la dynamique dʼune interface élastique se propageant dans un milieu faiblement désordonné. Les trois régimes dynamiques prévus théoriquement, cʼest-à-dire la reptation, le dépiégeage et le déplacement uniforme de la paroi, ont été directement mis en évidence dans ce système expérimental modèle. Nous discutons ici ces régimes et démontrons comment la reptation sous champ peut être contrôlée, non seulement par la température et le piégeage, mais aussi via une interaction avec des entités magnétiques situées à lʼintérieur ou à lʼextérieur de la couche magnétique. Les conséquences dʼeffets de confinement dans des dispositifs nanoscopiques sont brièvement discutées, comme certains résultats récents sur le mouvement de paroi provoqué par un courant ou assisté par un champ électrique. Finalement, de nouveaux développements théoriques et perspectives sont proposés.

The motion of elastic interfaces in disordered media is a broad topic relevant to many branches of physics. Field-driven magnetic domain wall motion in ultrathin ferromagnetic Pt/Co/Pt films can be well interpreted within the framework of theories developed to describe elastic interface dynamics in the presence of weak disorder. Indeed, the three theoretically predicted dynamic regimes of creep, depinning, and flow have all been directly evidenced in this model experimental system. We discuss these dynamic regimes and demonstrate how field-driven creep can be controlled not only by temperature and pinning, but also via interactions with magnetic entities located inside or outside the magnetic layer. Consequences of confinement effects in nano-devices are briefly reviewed, as some recent results on domain wall motion driven by an electric current or assisted by an electric field. Finally new theoretical developments and perspectives are discussed.

Publié le :
DOI : 10.1016/j.crhy.2013.08.001
Keywords: Magnetic films, Wall dynamics, Creep, Depinning, Disorder
Mot clés : Films magnétiques, Dynamique de paroi, Reptation, Dépiégeage, Désordre
Jacques Ferré 1 ; Peter J. Metaxas 2 ; Alexandra Mougin 1 ; Jean-Pierre Jamet 1 ; Jon Gorchon 1 ; Vincent Jeudy 1, 3

1 Laboratoire de physique des solides, UMR CNRS 8502, Université Paris-Sud, 91405 Orsay, France
2 School of Physics, M013, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
3 Université de Cergy-Pontoise, 95000 Cergy-Pontoise, France 
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     title = {Universal magnetic domain wall dynamics in the presence of weak disorder},
     journal = {Comptes Rendus. Physique},
     pages = {651--666},
     publisher = {Elsevier},
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Jacques Ferré; Peter J. Metaxas; Alexandra Mougin; Jean-Pierre Jamet; Jon Gorchon; Vincent Jeudy. Universal magnetic domain wall dynamics in the presence of weak disorder. Comptes Rendus. Physique, Volume 14 (2013) no. 8, pp. 651-666. doi : 10.1016/j.crhy.2013.08.001. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2013.08.001/

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