  We propose to realize the ground state cooling of magnomechanical resonator
in a parity-time (PT)-symmetric cavity magnomechanical system composed of a
loss ferromagnetic sphere and a gain microwave cavity. In the scheme, the
magnomechanical resonator can be cooled close to its ground state via the
magnomechanical interaction, and it is found that the cooling effect in
PT-symmetric system is much higher than that in non-PT-symmetric system.
Resorting to the magnetic force noise spectrum, we investigate the final mean
phonon number with experimentally feasible parameters and find surprisingly
that the ground state cooling of magnomechanical resonator can be directly
achieved at room temperature. Furthermore, we also illustrate that the ground
state cooling can be flexibly controlled via the external magnetic field.
