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Quantum manipulation of mechanical resonators has been widely applied infundamental physics and quantum information processing. Among them, cooling themechanical system to its quantum ground state is regarded as a key step. Inthis work, we propose a scheme which one can realize ground-state cooling ofresonator in a cavity magnomechanical system. The system consists of amicrowave cavity and a small ferromagnetic sphere, in which phonon-magnoncoupling and cavity photon-magnon coupling can be achieved via magnetostrictiveinteraction and magnetic dipole interaction, respectively. After adiabaticallyeliminating the cavity mode, an effective Hamiltonian which consists of magnonand mechanical modes is obtained. Within experimentally feasible parameters, wedemonstrate that the ground-state cooling of the magnomechanical resonator canbe achieved by extra magnetic damping. Unlike optomechanical cooling,magnomechanical interaction is utilized to realize the cooling of resonators.We further illustrate the ground-state cooling can be effectively controlled bythe external magnetic field.

Ground-state cooling of an magnomechanical resonator induced by magnetic damping