  Magnetic skyrmion is a topologically protected domain-wall structure at
nanoscale, which could serve as a basic building block for advanced spintronic
devices. Here, we propose a microwave field-driven skyrmionic device with the
transistor-like function, where the motion of a skyrmion in a voltage-gated
ferromagnetic nanotrack is studied by micromagnetic simulations. It is
demonstrated that the microwave field can drive the motion of a skyrmion by
exciting propagating spin waves, and the skyrmion motion can be governed by a
gate voltage. We also investigate the microwave current-assisted creation of a
skyrmion to facilitate the operation of the transistor-like skyrmionic device
on the source terminal. It is found that the microwave current with an
appropriate frequency can reduce the threshold current density required for the
creation of a skyrmion from the ferromagnetic background. The proposed
transistor-like skyrmionic device operated with the microwave field and current
could be useful for building future skyrmion-based circuits.
