Magnon-polaron transport in magnetic insulators

Abstract

We theoretically study the effects of strong magnetoelastic coupling on the transport properties of magnetic insulators. We develop a Boltzmann transport theory for the mixed magnon-phonon modes (magnon polarons) and determine transport coefficients and spin diffusion length. Magnon-polaron formation causes anomalous features in the magnetic field and temperature dependence of the spin Seebeck effect when the disorder scattering in the magnetic and elastic subsystems is sufficiently different. Experimental data by Kikkawa et al. [PRL 117, 207203 (2016)] on yttrium iron garnet films can be explained by an acoustic quality that is much better than the magnetic quality of the material. We predict similar anomalous features in the spin and heat conductivity and non-local spin transport experiments.

References in corpus (5)

• Magnon spin transport driven by the magnon chemical potential in a magnetic insulator
• Magnon Polarons in the Spin Seebeck Effect
• Thermal spin dynamics of yttrium iron garnet
• Coherent elastic excitation of spin waves
• Stability of Bose Einstein condensates of hot magnons in YIG

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