  An optical frequency comb is a spectrum of optical radiation which consists
of evenly spaced and phase-coherent narrow spectral lines and is initially
invented in laser for frequency metrology purposes. A direct analogue of
frequency combs in the magnonic systems has not been demonstrated to date. In
our experiment, we generate a new magnonic frequency comb in the resonator with
giant mechanical oscillation through the magnomechanical interaction. We
observe the magnonic frequency comb contains up to 20 comb lines, which are
separated to the mechanical frequency of the 10.08 MHz. The thermal effect
based on the strong pump power induces the cyclic oscillation of the magnon
frequency shift, which leads to a periodic oscillation of the magnonic
frequency comb. Moreover, we demonstrate the stabilization and control of the
frequency spacing of the magnonic frequency comb via injection locking. Our
work lays the groundwork of magnonic frequency combs for sensing and metrology.
