  We report the existence of entangled steady-states in bipartite quantum
magnonic systems at elevated temperatures. We consider dissipative dynamics of
two magnon modes in a bipartite antiferromagnet, subjected to interaction with
a phonon mode and an external rotating magnetic field. To quantify the
bipartite magnon-magnon entanglement, we use entanglement negativity and
compute its dependence on temperature and magnetic field. We provide evidence
that the coupling between magnon and phonon modes is necessary for the
entanglement, and that, for any given phonon frequency and magnon-phonon
coupling rate, there are always ranges of the magnetic field amplitudes and
frequencies for which magnon-magnon entanglement persists at room temperature.
