![]() ![]() Based on it, a lot of theoretical and experimental researches have been done. In addition, the YIG sphere has nonlinearity and adjustability in many quantum information carriers, these excellent properties make it possible to find many interesting and important phenomena in cavity-magnon systems and cavity magnomechanical systems. Here, the magnons inside the YIG sphere can be considered as collectively excited, and the frequency of them can be controlled by an external magnetic field.īecause the YIG sphere has characteristics of high density and low loss, the Kittel mode 23 (a ferromagnetic resonance mode) in it can be strongly coupled 24, 25, 26 with the cavity mode. ![]() The varying magnetization caused by the excitation of the magnons in the YIG sphere results in the geometric deformation of the surface, and it leads to the magnon-phonon coupling. And a small yttrium iron garnet (YIG) sphere is introduced into the cavity magnomechanical system as an effective mechanical resonator. The emergence of magnetostrictive force brings us a new way to achieve different information carriers 21, 22. However, the adjustability of them are not very good. ![]() As we know, traditional optomechanical systems utilize radiation force 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, electrostatic force 18, 19, and piezoelectric force 20 for the interaction between phonons and cavity photons. Among them, the coupling between photons and magnons is realized by the magnetic dipole interaction, and magnetostrictive force is a key to the magnon-phonon coupling. In recent years, the cavity magnomechanical systems has been becoming a novel platform for realizing the coupling between photons, magnons and phonons. Our study may inspire the field of magnetically controlled phonon lasers. Finally, with the experimentally feasible parameters, threshold power in our scheme is close to the case of optomechanical systems. Compared with phonon laser in optomechanical systems, our scheme brings a new degree of freedom of manipulation. Then, we demonstrate that the adjustable external magnetic field can be used as a good control method to the phonon laser. Frist, the intensity of driving magnetic field which can reach the threshold condition of phonon laser is given. 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. We theoretically study phonon laser in a cavity magnomechanical system, which consist of a microwave cavity, a sphere of magnetic material and a uniform external bias magnetic field. Using phonons to simulate an optical two-level laser action has been the focus of research. ![]()
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