Berlin 2018 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 17: Skyrmions III (joint session MA/TT/KFM)
KFM 17.1: Vortrag
Mittwoch, 14. März 2018, 15:00–15:15, EB 301
Skyrmion drag effect: — •Adel Abbout1, Joseph Weston2, Xavier Waintal2, and Aurelien Manchon1 — 1King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia — 2CEA Grenoble, France.
In this work, we study the motion of skyrmionic magnetic textures and analyze the current induced by this motion using time-dependent non-equilibrium Green's function formalism implemented on a real-space tight-binding model. We focus on the time dependent distribution of the nonequilibrium charge and spin densities and discuss the corresponding topological Hall effect. The perturbation induced by this motion applies a torque on the whole texture. The influence of the generated current on the whole texture is discussed and its signature is unveiled in the renormalization of the damping parameter. A cooperative effect due to the collective motion of skyrmions is proposed in order to enhance the skyrmion's velocity. The stationary regime is analyzed as a function of the different parameters of the system and explained using the formalism of electronic pumping. A simple formula for the current is proposed.