Dynamics and nonmonotonic drag for individually driven skyrmions

We examine the motion of an individual skyrmion driven through assembly other skyrmions in absence quenched disorder. The behavior is determined by ratio damping and Magnus terms, known as intrinsic Hall angle. For fixed drive dominated regime, effective viscosity decreases monotonically with increasing density. In contrast, velocity varies nonmonotonically density, there a regime which moves faster well pronounced speed-up effect traveling dense medium more rapidly than for low densities or single-particle limit. velocity-force curves Magnus-dominated exhibit overshoot differences from damping-dominated regime. find finite threshold force increases density drive-dependent map dynamic phase diagrams showing motion, nonlinear flow, speed-up, saturation regimes. some cases, can reduce angle while producing boost, could be valuable applications.