  Antiferromagnets are promising materials for future spintronic applications
due to their unique properties including zero stray fields, robustness versus
external magnetic fields and ultrafast dynamics, which have attracted extensive
interest in recent years. In this work, we investigate the dynamics of isolated
skyrmions in an antiferromagnetic nanotrack with a voltage-gated region. It is
found that the skyrmion can be jointly controlled by the driving current and
the voltage-controlled magnetic anisotropy gradient. We further propose a
design of logic computing gates based on the manipulation of antiferromagnetic
skyrmions, which is numerically realized combining several interactions and
phenomena, including the spin Hall effect, voltage-controlled magnetic
anisotropy effect, skyrmion-skyrmion interaction, and skyrmion-edge
interaction. The proposed logic gates can perform the basic Boolean operations
of the logic AND, OR, NOT, NAND and NOR gates. Our results may have a great
impact on fundamental physics, and be useful for designing future non-volatile
logic computing devices with ultra-low energy consumption and ultra-high
storage density.
