  Cavity optomechanics, providing an inherently nonlinear interaction between
photons and phonons, have shown enomerous potential in generating macroscopic
quantum entanglement. Here we propose to realize diverse bipartite and
tripartite entanglement in cavity-magnon optomechanics. By introducing magnons
to standard cavity optomechanics, not only tunable optomechanical entanglement
and magnon-magnon entanglement can be achieved, but also flexible tripartite
entanglement including magnon-photon-phonon entanglement, magnon-magnon-photon
and -phonon entanglement can be generated. Moreover, optimal bipartite and
tripartite entanglement can be achieved by tuning parameters. We further show
that all entanglement can be enhanced via engineering the magnon-photon
coupling,and is proven to be robust against the bath temperature within the
survival temperature. Besides, we find that the optomechanical entanglement can
be protected or restored by bad magnons with large decay rate, while other
entanglement is severely reduced. The results indicate that our proposal
provides a novel avenue to explore and control tunable macroscopic quantum
effects in hybrid cavity-magnon optomechanics.
