Dynamics of Dzyaloshinskii-Moriya Spin Textures in Nanotubes
Dr. Oleg Tretiakov (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 interaction (DMI) and breaking of translational invariance for nonuniform nanowires. Furthermore, we argue that the combined effects of space curvature and spin-orbit induced DMI can lead to even more exciting possibilities for domain wall propagation. For example, we show that domain walls are more robust to perturbations in ferromagnetic nanotubes with DMI and can be manipulated differently depending on their orientation and chirality.