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We have investigated hybridized magnon-phonon excitation (magnon polarons) inspin Seebeck effects (SSEs) in Bi$_x$Y$_{3-x}$Fe$_{5}$O$_{12}$(Bi$_x$Y$_{3-x}$IG; $x=0$, $0.5$, and $0.9$) films with Pt contact. We observedsharp peak structures in the magnetic field $H$ dependence of the longitudinalSSE (LSSE) voltages, which appear when the phonon dispersions are tangential tothe magnon dispersion curve in Bi$_x$Y$_{3-x}$IG. By increasing the Bi amount$x$, the peak fields in the LSSE shift toward lower $H$ values due to thereduction of the sound velocities in Bi$_x$Y$_{3-x}$IG. We also measured theSSE in a nonlocal configuration and found that magnon-polaron anomalies appearwith different signs and intensities. Our result shows composition-tunabilityof magnon-polaron anomalies and provides a clue to further unravel the physicsof magnon-polaron SSEs.

Composition-tunable magnon-polaron anomalies in spin Seebeck effects in epitaxial Bi$_x$Y$_{3-x}$Fe$_{5}$O$_{12}$ films