  Magnetic skyrmions, topologically-stabilized spin textures that emerge in
magnetic systems, have garnered considerable interest due to a variety of
electromagnetic responses that are governed by the topology. The topology that
creates a microscopic gyrotropic force also causes detrimental effects, such as
the skyrmion Hall effect, which is a well-studied phenomenon highlighting the
influence of topology on the deterministic dynamics and drift motion.
Furthermore, the gyrotropic force is anticipated to have a substantial impact
on stochastic diffusive motion; however, the predicted repercussions have yet
to be demonstrated, even qualitatively. Here we demonstrate enhanced
thermally-activated diffusive motion of skyrmions in a specifically designed
synthetic antiferromagnet. Suppressing the effective gyrotropic force by tuning
the angular momentum compensation leads to a more than 10 times enhanced
diffusion coefficient compared to that of ferromagnetic skyrmions.
Consequently, our findings not only demonstrate the gyro-force dependence of
the diffusion coefficient but also enable ultimately energy-efficient
unconventional stochastic computing.
