We report an unconventional twofold-symmetric magnetoelastic coupling in Ni films, mediated by Rayleigh surface acoustic waves (SAWs). This unique magnetoelastic symmetry originates from a dominant vertical shear strain ${ϵ}_{yz}$, which becomes prominent due to the low effective elastic modulus of Ni film. As the film thickness increases, ${ϵ}_{yz}$ surpasses the conventional Rayleigh SAW strain ${ϵ}_{xx}$, a consequence originated from the elastic modulus mismatch at the film-substrate interface. This finding highlights the dominance of ${ϵ}_{yz}$ in soft thin film under SAW excitation, offering a new platform to excite strong nonreciprocal and topological magnon-phonon hybridization.

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• Ferromagnetism
• Magnetoacoustic effect
• Magnetoelastic effect
• Surface acoustic wave