Efficient spin-wave excitation by surface acoustic waves in ultra-low damping YIG/ZnO-heterostructures

Abstract

We demonstrate the efficient excitation of spin waves in the ultra-low magnetic damping material yttrium-iron-garnet (YIG) by surface acoustic waves (SAWs). To this end, we employ interdigital transducers fabricated on a piezoelectric zinc oxide (ZnO) thin film covering the YIG. This enables the excitation of coherent, propagating Rayleigh-type and Sezawa-type SAWs. We find that the ultralow magnetic damping of YIG is retained after the ZnO-deposition and we carry out a comprehensive investigation of the magnetoelastic interaction due to the different SAW modes as a function of the external magnetic field magnitude and orientation. By measuring the SAW attenuation our experiments reveal a highly anisotropic and non-reciprocal SAW-SW-interaction in agreement with our model caluclation, while demonstrating that low-damping magnons can be efficiently excited by SAWs.

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• Intrinsic and non-local Gilbert damping in polycrystalline nickel studied by Ti:Sapphire laser fs spectroscopy
• Surface acoustic wave driven ferromagnetic resonance in (Ga,Mn)(As,P) epilayers
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Cited by in corpus (2)

• Magnon-polaron control in a surface magnetoacoustic wave resonator
• Magnetoelastic Waves in Ferromagnetic Thin Films Mediated by Dipolar Interactions