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We numerically study the acoustic parametric amplification of spin wavesusing surface acoustic waves (SAW) in a magnetic thin film. First, weillustrate how the process of parametric spin-wave generation using short-wavedSAWs with a fixed frequency allows to tune frequencies of the generated spinwaves by the applied magnetic field. We further present the amplification ofmicrowave driven spin waves using this method. The decay length and theamplitude of the driven spin waves can be amplified up to approximately 2.5 and10 times compared to the reference signal, respectively. More importantly, theproposed design can be used as a frequency converter, in which a low (high)frequency spin-wave mode stimulates the excitation of a high (low) frequencymode. Our results pave the way in designing highly flexible and efficienthybrid magnonic device architectures for microwave data transport andprocessing.

Amplification and frequency conversion of spin waves using acoustic waves