Controlling avalanche soliton nucleation in a chiral soliton lattice on a monoaxial chiral magnet CrNb₃S₆ by dynamic strain

The monoaxial chiral magnet $CrNb3S6$ exhibits a chiral soliton lattice (CSL) upon application of an external magnetic field (H) perpendicular to the helical axis (c-axis). The increase in the soliton (kink) number of the CSL in the process of decreasing H accompanies soliton penetration after nucleation at the surface. Avalanche soliton nucleation occurs during the initial process of soliton nucleation. We applied dynamic strain with scores of MHz to the crystal with the crystal size along the c-axis of 10 μm from the edge of the c-axis, so that we controlled the avalanche soliton nucleation by modifying the surface barrier. The present results suggest that the acoustic wave is useful for controlling the soliton number.