Role of Magnon-Magnon Scattering in Magnon Polaron Spin Seebeck Effect

Abstract

The spin Seebeck effect (SSE) signal of magnon polarons in bulk-Y3Fe5O12 (YIG)/Pt heterostructures is found to drastically change as a function of temperature. It appears as a dip in the total SSE signal at low temperatures, but as the temperature increases, the dip gradually decreases before turning to a peak. We attribute the observed dip-to-peak transition to the rapid rise of the four-magnon scattering rate. Our analysis provides important insights into the microscopic origin of the hybridized excitations and the overall temperature dependence of the SSE anomalies.

References in corpus (7)

• Spin Seebeck insulator
• Observation of the Spin-Seebeck Effect in a Ferromagnetic Semiconductor
• Theory of magnon-driven spin Seebeck effect
• Magnon Polarons in the Spin Seebeck Effect
• Long-distance spin transport in a disordered magnetic insulator
• Direct observation of magnon-phonon coupling in yttrium iron garnet
• Nonlocal magnon-polaron transport in yttrium iron garnet

Cited by in corpus (1)

• Composition-tunable magnon-polaron anomalies in spin Seebeck effects in epitaxial Bi${}_x$Y${}_{3-x}$Fe${}_5$O${}_{12}$ films