Magnetic frequency combs (MFCs), which consist of equally spaced spectral lines generated by nonlinear magnetization dynamics, are promising for precision frequency control, broadband signal processing, and on-chip magnonic devices. However, conventional MFCs generally require strong microwave pumping and bulky magnetic resonators, resulting in high power consumption, thermal perturbations, and limited integrability. Here, we propose a low-power route to MFC generation through nonlinear magnetoelastic coupling between a standing surface acoustic wave (SAW) and magnons in a ferromagnetic thin film. Micromagnetic simulations are performed for a 1000 nm × 1000 nm × 5 nm CoFeB film with absorbing boundary regions. The intrinsic response contains a single ferromagnetic-resonance peak near 8 GHz, consistent with the Kittel estimate of 7.86 GHz. When a longitudinal Rayleigh-type standing strain field is applied, the periodically modulated magnetoelastic effective field produces cascaded sidebands. Setting the magnetoelastic coefficients to zero eliminates the comb, confirming that magnetoelastic coupling is the essential generation mechanism.

The dependences of the comb on SAW strain amplitude, frequency, propagation direction, and magnetic anisotropy are systematically quantified. At a SAW frequency of 2 GHz and a strain amplitude of 2‰, a stable comb with a 2 GHz line spacing is obtained, demonstrating that the repetition frequency is directly set by the acoustic frequency. A clearly resolvable multi-line comb appears at a strain amplitude of approximately 0.1‰; below this observational threshold, only the fundamental acoustic mode and weak low-order mixing components remain. Sweeping the SAW frequency from 0.2 to 2 GHz continuously tunes the line spacing: a 0.2 GHz SAW produces a dense comb spanning about 3 GHz, intermediate frequencies of 0.8–1 GHz yield comparatively uniform line intensities, and a 2 GHz SAW extends the bandwidth beyond 30 GHz, although the high-order lines decay more rapidly. The comb intensity is strongly anisotropic because the magnetoelastic torque depends on the relative orientation of the equilibrium magnetization and SAW propagation direction. In addition, an intermediate uniaxial anisotropy constant of about 2.4 × 10⁴ J/m³ provides the best balance between coherent magnetic alignment and dynamic response; weaker anisotropy (≤2×10⁴ J/m³) leads to nonuniform magnetization, whereas strong anisotropy (>5×10⁴ J/m³) suppresses the precession and reduces the number of comb lines. These findings identify SAW-driven periodic magnetoelastic modulation and nonlinear sideband cascading as the core physics of the MFC and establish an acoustically programmable, low-power, thin-film platform for tunable and highly integrated magnetoacoustic frequency-comb devices.