The generation of magnon polarons, which are hybridized states resulting from strong magnon-phonon coupling, is key to enabling coherent manipulation in acoustic and spintronic devices. However, the conventional device configuration, a magnetic thin film on a thick piezoelectric layer, often has difficulty achieving large magnon-phonon coupling due to very small spatial-mode overlap. Here, we demonstrate the generation of magnon polarons by using a mode-matched on-chip magnomechanical system. A configuration with a thin piezoelectric film on a magnetic layer with a thickness of several micrometers has been found to sustain deeply distributed magnon modes that enable magnetoelastic coupling to phonons over almost the entire mode volume. The enhanced spatial-mode overlap has generated magnon polarons the spectra of which have shown distinct avoided crossings. This magnomechanical system will facilitate the utilization of coherent magnon-phonon conversion and their hybrid states in functional phononic devices.

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• Acoustic phonons
• Magnetoacoustic effect
• Magnetoelastic effect
• Magnons
• Polarons
• Spintronics
• Multilayer thin films
• Surface acoustic wave