Magnetic response of a highly nonlinear soliton lattice in a monoaxial chiral helimagnet

Abstract

We present a theory of nonlinear magnetic response of a chiral soliton lattice state in a monoaxial chiral helimagnet under an oscillating magnetic field. The chiral soliton lattice is stabilized by a static magnetic field applied perpendicular to the chiral axis. Just below the critical field strength, where an incommensurate-to-commensurate phase transition occurs, the soliton density becomes quite low and almost isolated 2π kinks are partitioned by vast ferromagnetic regions. We consider this highly nonlinear regime and demonstrate that internal deformations of each kink give rise to the nonlinear response in this regime. © 2020 American Physical Society.