The Magnetic Dynamics Of Magnetic Skyrmion In Chiral Magnets

We investigated the magnetic dynamics of skyrmion by the spin configuration and the skyrmion dynamics driven by periodically varying spin currents.The magnetic skyrmion structure can be formed in the chiral magnets(CMs)with strong Dzyaloshinskii-Moriya interactions.In this work,we propose a way of artificially tailoring the topological details of the skyrmion such as its radial and whirling symmetric patterns by external magnetic fields besieging the CM slab.As long as the boundary magnetic fields are strong enough to fix the boundary ferromagnetism,the attained skyrmion profile is stable over time.The dynamics of spins is considered by numerical solving the non-equilibrium Landau-Lifshitz-Gilbert equation.In this work,we investigated the spin dynamics in a slab of chiral magnets induced by an alternating(ac)spin current.Periodic trajectories of the skyrmion in real space are discovered under the ac current as a result of the Magnus and viscous forces,which originate from the Gilbert damping,the spin transfer torque,and the ?-nonadiabatic torque effects.The results are obtained by numerically solving the Landau-Lifshitz-Gilbert equation and can be explained by the Thiele equation characterizing the skyrmion core motion.