Magnon-magnon coupling can be utilized to develop highly efficient information transmission and processing devices, such as spin-wave-based devices. Moreover, it is crucial in quantum information technology, particularly in facilitating interactions and information transfer between quantum bits. In this study, we reported the electric field-triggered magnon-magnon coupling in CoZr/Ta/CoZr/$\mathrm{Pb}\left({\mathrm{Mg}}_{1/3}{\mathrm{Nb}}_{2/3}\right){\mathrm{O}}_{3-0.29}\mathrm{PbTi}{\mathrm{O}}_3$ sandwich-structured multilayer film. It maintains a uniform precession ferromagnetic resonance mode under an unpolarized state and demonstrates magnon-magnon coupling under an electric field of −6.25 kV/cm. The changes in effective damping of CoZr (bottom) are attributed to the magnon-driven spin screening effect (it will affect the spin-polarized charges at the ferromagnetic/ferroelectric interface to be distributed in a spiral pattern) induced by ferroelectric polarization, which breaks the parity-time symmetry within the sandwich structure, facilitating electric-field-triggered magnon-magnon coupling. This discovery opens a pathway for achieving magnon-magnon coupling by direct ferromagnetic exchange interactions.

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• Ferroelectricity
• Spin-orbit coupling
• Ferroelectrics
• Thin films
• Ferromagnetic resonance