  Magnetic skyrmions have potential applications in next-generation spintronics
devices with ultralow energy consumption. In this work, the current-driven
skyrmion motion in a narrow ferromagnetic nanotrack with voltage-controlled
magnetic anisotropy (VCMA) is studied numerically. By utilizing the VCMA
effect, the transport of skyrmion can be unidirectional in the nanotrack,
leading to a one-way information channel. The trajectory of the skyrmion can
also be modulated by periodically located VCMA gates, which protects the
skyrmion from destruction by touching the track edge. In addition, the location
of the skyrmion can be controlled by adjusting the driving pulse length in the
presence of the VCMA effect. Our results provide guidelines for practical
realization of the skyrmion-based information channel, diode, and racetrack
memory.
