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arXiv · 1912.11573

Magnon polarons in the spin Peltier effect

Reimei Yahiro·Takashi Kikkawa·Rafael Ramos·Koichi Oyanagi·Tomosato Hioki·Shunsuke Daimon·Eiji Saitoh
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Abstract

We report the observation of anomalous peak structures induced by hybridized magnon-phonon excitation (magnon polarons) in the magnetic field dependence of the spin Peltier effect (SPE) in a Lu$_{2}$Bi$_{1}$Fe$_{4}$Ga$_{1}$O$_{12}$ (BiGa:LuIG) with Pt contact. The SPE peaks coincide with magnetic fields tuned to the threshold of magnon-polaron formation, consistent with the previous observation in the spin Seebeck effect. The enhancement of SPE is attributed to the lifetime increase in spin current caused by magnon-phonon hybridization in BiGa:LuIG.

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Reimei Yahiro, Takashi Kikkawa, Rafael Ramos, Koichi Oyanagi, Tomosato Hioki, Shunsuke Daimon, Eiji Saitoh. 2019-12-25. Magnon polarons in the spin Peltier effect. https://doi.org/10.1103/physrevb.101.024407

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