Speaker
Description
Low-energy dynamics of magnetic topological defects are governed by collective modes, e.g., center-of-mass coordinates and helicity of skyrmions, as well as the local excitations of the defects with energies below the magnon continuum. The coupling between these modes makes it possible to excite complex, large-amplitude dynamics by periodically oscillating electromagnetic fields and electrical currents. In particular, skyrmions in frustrated magnets with a centrosymmetric crystal lattice can have a local electromagnon mode that can be excited by both electric and magnetic fields and is coupled to the skyrmion chirality. This mode is responsible for the deformation of a moving skyrmion that makes it massive. I will discuss the dynamics of periodically driven topological defects, simulated numerically and described analytically using generalized Thiele equations, which can be used for fast switching of magnetic states and information processing.