  Here, we research a novel cavity magnomechanical system, where magnon driven
by a microwave field couples with a phonon mode with a nonlinear
magneostrictive interaction (radiation pressure-like). Based on this
interaction, we numerically demonstrate PT-symmetric chaos in this system. With
only one monochrome driving, the chaotic threshold is lowered to a rather low
levels, this is due to the dynamical enhancement of nonlinearity in the
PT-symmetry broken phase. Moreover, by simply manipulating the phase transition
between PT-symmetry phase and PT-symmetry broken phase, we can switch the
system between into and out of chaotic regimes. Our work may broaden the cavity
magnomechanics and provide a promising application for magnetic chaos-related
security communications.
