Strain-overlap and surface-confinement engineering in AlScN/YIG magnetoacoustic devices

Abstract

We establish AlScN/YIG/GGG as an integrated piezoelectric-magnetic heterostructure for electrically generating surface acoustic waves (SAWs) and coupling them to spin waves in monocrystalline YIG. Combining electrical transmission measurements of interdigital-transducer delay lines with finite-element simulations, we identify the excited modes as Rayleigh-type SAWs whose surface confinement varies strongly with AlScN thickness. The resulting changes in the strain field within YIG directly modify the magnetoelastic coupling. Using the simulated complex strain components and an effective-driving-field model, we calculate the relative SAW attenuation for several AlScN thicknesses and wavelengths. The calculations qualitatively reproduce the measurements: at all investigated wavelengths, thinner AlScN layers yield stronger relative attenuation. Experimentally, the attenuation approaches 70dB/mm for a 54.5nm-thick AlScN layer at a wavelength of 1.2$μ$m. However, the strongest relative attenuation does not maximize the detectable signal. Instead, the absolute field-induced transmission change peaks at an AlScN thickness of approximately 100nm, with the precise optimum depending on the acoustic wavelength. These results identify the AlScN thickness as a key design parameter for balancing magnetoelastic attenuation and pure SAW transmission in AlScN/YIG devices.