Phonon laser in a cavity magnomechanical system
arXiv:1906.01871
Abstract
The phonon analog of an optical laser has become the focus of research. We theoretically study phonon laser in a cavity magnomechanical system, which consist of a microwave cavity, a small ferromagnetic sphere and an uniform external bias magnetic field. This system can realize the phonon-magnon coupling and the cavity photon-magnon coupling via magnetostrictive interaction and magnetic dipole interaction respectively, the magnons are driven directly by a strong microwave field simultaneously. Frist, the intensity of driving magnetic field which can reach the threshold condition of phonon laser is given. Then, we demonstrate that the phonon laser can be well controlled by an adjustable external magnetic field without changing other parameters, which provides an additional degree of freedom compared to the phonon laser in optomechanical systems. Finally, with the experimentally feasible parameters, threshold power in our scheme is close to the case of optomechanical systems. Our results provide a theoretical basis for the realization of phonon lasers in magnomechanical systems.
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