Magnon control of light transmission in a  -symmetric-like cavity magnomechanical system

Abstract

We theoretically study magnon control of light transmission in a cavity magnomechanical system, which consists of an active magnon mode and a passive microwave cavity mode. Phonon-magnon coupling and cavity photon-magnon coupling can be achieved via magnetostrictive interaction and magnetic dipole interaction respectively in this system. By driving a small ferromagnetic sphere which connected by an optical fiber to the inner wall of a microwave cavity, the effective magnon-gain can be obtained. We find that the transparent, absorptive and amplificatory windows can appear by adjusting the gain of the magnon mode, and the introduction of gain can realize significant amplification of transmitted probe power, especially at the EP point. In comparison with traditional optomechanically induced amplification, the amplification can be controlled not only by adjusting the driving field and magnon-microwave coupling, but also by adjusting the external magnetic field. Our results lays a theoretical foundation for the study of the magnon control in magnomechanical systems.