Topological Dynamics of Dzyaloshinskii-Moriya Spin Textures
Lundi 22 septembre 2014 11:00
- Duree : 1 heure
Lieu : SPINTEC, Bât 1005 - salle 446, CEA Grenoble, 17 rue des martyrs
Orateur : Oleg TRETIAKOV (Assistant Prof at the Institute for Materials Research, Tohoku University, Japan)
Ferromagnetic (FM) and antiferromagnetic (AFM) structures can be employed to store and manipulate information by means of topological spin textures, such as skyrmions, vortices, or domain walls. We study current and field driven spin-texture dynamics in thin FM and AFM nanostructures. We derive effective equations of motion describing the dynamics of a spin-texture soft modes associated with its topological defects. Because these spin textures are topological objects, the equations are rather universal and depend only on a few parameters. This method allows to include in FMs such effects as Dzyaloshinskii-Moriya (DM) interaction and breaking of translational invariance for nonuniform nanowires. In AFMs, the dynamics is more complex because of the coupling between the staggered field and magnetization. Nevertheless, using the collective coordinate approach we are able to describe the AFM spin-texture dynamics and show that it is equivalent to the motion of a massive particle subjected to friction and external forces. Furthermore, we argue that the combined effects of space curvature and spin-orbit induced DM interaction can lead to even more exciting possibilities for domain wall propagation. For example, we show that domain walls are more robust to perturbations in DM ferromagnetic nanotubes and can be manipulated differently depending on their orientation and chirality.
Contact : mair.chshiev@cea.fr
Discipline évènement : (Physique)
Nature évènement : (Séminaire)
Evènement répétitif : (Séminaire nanomagnétisme et électronique de spin)
Site de l'évènement : Site CEA avec accès badge
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