Dissipative-coupling-induced magnomechanical chaos

Abstract Chaotic motion that exhibits extraordinary dynamic behavior has attracted particular attention in magnonics in the context of understanding nonlinear magnomechanical interaction. Here, we theoretically explore the magnomechanical chaos induced by dissipative coupling in an open cavity magnomechanical system. Numerical calculations of the magnomechanical dynamics show that the introduction of dissipative coupling can greatly enhance the nonlinearity of the system and induces ultra-low driving threshold chaotic motion, which effectively solves the bottleneck that the weak magnetostrictive interaction cannot trigger chaotic motion in a cavity magnomechanical system. Furthermore, we find that the degree of chaos represented by the Lyapunov exponent can be well tuned by changing the dissipative coupling strength. In addition to providing insight into chaotic behavior in open magnomechanical systems, dissipative-coupling-induced chaotic motion may also hold for other magnonic quantum systems since magnons possess excellent compatibility with other quasiparticles, and may find applications in the chaotic transfer of information.