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In this work, we investigated the spin dynamics in a slab of chiral magnetsinduced by an alternating (ac) spin current. Periodic trajectories of theskyrmion in real space are discovered under the ac current as a result of theMagnus and viscous forces, which originate from the Gilbert damping, the spintransfer torque, and the $ \beta $-nonadiabatic torque effects. The results areobtained by numerically solving the Landau-Lifshitz-Gilbert equation and can beexplained by the Thiele equation characterizing the skyrmion core motion.

Skyrmion dynamics in a chiral magnet driven by periodically varying spin currents