Speaker
Description
Magnonic devices based on spin-wave (SW) propagation in thin-film yttrium iron garnet (YIG) are promising candidates for compact, low-power RF components targeting 5G frequency bands. A central challenge in their practical adoption is insertion loss, which stems from the transduction of electromagnetic energy into spin waves and back. In this work, we present a comprehensive study of coplanar waveguide (CPW) transducers on YIG thin films, combining micromagnetic simulations performed with magnum.np, analytical modeling based on Kalinikos–Slavin theory, and experiments in a mutually cross-validating framework.
Transducer efficiency is quantified through the spin-wave resistance $R_{sw}$ (which describes the energy put into the spin-wave) and insertion loss. Analytically, $R_\mathrm{sw}$ is calculated via the Kalinikos–Slavin model. Micromagnetic simulations using magnum.np solve the Landau–Lifshitz–Gilbert equation, incorporating an external bias field and current-induced Oersted fields.
We perform systematic parameter studies — varying conductor width, height, center-to-center spacing, and YIG film thickness — to guide the design of transducers for optimal spin-wave efficiency $\eta_\mathrm{sw} = R_\mathrm{sw}/(R_\mathrm{sw} + R_\Omega)$
and insertion loss.