Strengthening magnetoacoustic coupling is crucial to the improvement of surface acoustic wave (SAW)-driven spintronics devices. A key challenge in enhancing magnetoacoustic coupling is minimizing the phonon dissipation of the SAW device, which usually requires complicated SAW engineering. This paper presents the observation of an order-of-magnitude enhancement of the magnetoacoustic coupling within a $\mathrm{Co}$/$\mathrm{Cu}$/$\mathrm{Ni}$-$\mathrm{Fe}$ multilayer structure deposited on a ${\mathrm{Li}\mathrm{Nb}\mathrm{O}}_3$ piezoelectric substrate. This enhancement is driven by spin current transmission, facilitated by the nonparallel alignment of magnetizations between the $\mathrm{Co}$ layer and the $\mathrm{Ni}$-$\mathrm{Fe}$ layer. This work provides a versatile platform for advancing magnetoacoustic coupling devices based on the principle of spin current, which exhibits potential for next-generation on-chip SAW spintronics devices.

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• Magnetoacoustic effect
• Magnons
• Phonons
• Spin current
• Spin transfer torque
• Magnetic multilayers
• Piezoelectrics
• Surface acoustic wave