  We performed Raman spectroscopy measurements under temperature changes from
10 K up to 850 K to probe the phonon-spin coupling in Y$_2$NiMnO$_6$. The
spin-phonon coupling was observed as a softening of the stretching mode,
indicating this phonon stabilizes the magnetic interaction. The result
indicates the rare earth ionic radius in Re$_2$NiMnO$_6$ double perovskites is
not the unique parameter influencing the spin-coupling magnitude.
