Magnon polarons in the spin Peltier effect
Reimei Yahiro, Takashi Kikkawa, R. Ramos, Koichi Oyanagi, Tomosato Hioki, Shunsuke Daimon, Eiji Saitoh
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 ${\mathrm{Lu}}_{2}{\mathrm{Bi}}_{1}{\mathrm{Fe}}_{4}{\mathrm{Ga}}_{1}{\mathrm{O}}_{12}$ (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.
Topics & Concepts
MagnonPolaronCondensed matter physicsThermoelectric effectSpin (aerodynamics)PhysicsPhononExcitationMagnetic fieldElectronFerromagnetismQuantum mechanicsThermodynamicsMagnetic properties of thin filmsPhysics of Superconductivity and MagnetismMagneto-Optical Properties and Applications