  We propose a scheme to improve magnon-photon-phonon entanglement in cavity
magnomechanics using coherent feedback loop. In addition, we prove that the
steady state and dynamical state of the system is a genuine tripartite
entanglement state. We use the logarithmic negativity as the witness of quantum
correlations to quantify the entanglement of all bipartite subsystem, and
genuine tripartite entanglement via the nonzero minimum residual contangle, in
steady and dynamical regime. We consider the feasible experiment parameters to
realize the tripartite entanglement. We show that the entanglement can be
significantly improved with coherent feedback using a suitable tuning of the
reflective parameter of the beam splitter. The entanglement is robust against
the thermal effects. Our proposal scheme to improve the entanglement can be of
interest to applications in quantum information.
