  Magnetic skyrmions are exciting candidates for energy-efficient computing due
to their non-volatility, detectability,and mobility. A recent proposal within
the paradigm of reversible computing enables large-scale circuits composed
ofdirectly-cascaded skyrmion logic gates, but it is limited by the
manufacturing difficulty and energy costs associated withthe use of notches for
skyrmion synchronization. To overcome these challenges, we therefore propose a
skyrmion logicsynchronized via modulation of voltage-controlled magnetic
anisotropy (VCMA). In addition to demonstrating theprinciple of VCMA
synchronization through micromagnetic simulations, we also quantify the impacts
of current den-sity, skyrmion velocity, and anisotropy barrier height on
skyrmion motion. Further micromagnetic results demonstratethe feasibility of
cascaded logic circuits in which VCMA synchronizers enable clocking and
pipelining, illustrating afeasible pathway toward energy-efficient large-scale
computing systems based on magnetic skyrmions.
