Surface acoustic waves (SAWs) excite GHz phonons that resonantly hybridize with magnons in the ferromagnet. Reducing the SAW fundamental frequency compresses the overtone spacing, enabling quasicontinuous and broadband spectral access to magnon-phonon interactions. We observe an enhancement of the magnon-phonon interaction strength at the monostable-bistable transition of magnetization, evaluated from the normalized magnon-induced SAW absorption and attributed to increased magnetic susceptibility. This approach enables systematic mapping of magnon-phonon hybridization over wide frequency and magnetic-field ranges and supports tunable magnonic functionalities.

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• Magnetic phase transitions
• Magnetoelastic effect
• Magnonics
• Spin waves
• Spin-phonon coupling
• Heusler alloy
• Magnetic thin films
• Surface acoustic wave