Current-induced sliding motion in a helimagnet MnAu${}_2$

We found signatures of current-induced sliding motion in helimagnetic $\mathrm{M}\mathrm{n}{\mathrm{A}\mathrm{u}}_2$ thin films. An abrupt change in differential resistivity occurred at a threshold bias current in the helimagnetic state, whereas it was absent in the induced ferromagnetic state. Broadband voltage noise also emerged above the threshold current in the helimagnetic state. Based on the similarity to canonical charge/spin density wave systems, we ascribed the origin of these phenomena to the sliding motion of the helimagnetic structure.