Magnon-polaron transport in magnetic insulators

B. Flebus; K. Shen; T. Kikkawa; K.I. Uchida; Z. Qiu; E. Saitoh; R.A. Duine; G.E.W. Bauer

doi:10.1103/PhysRevB.95.144420

Magnon-polaron transport in magnetic insulators

B. Flebus, K. Shen, T. Kikkawa, K.I. Uchida, Z. Qiu, E. Saitoh, R.A. Duine, G.E.W. Bauer

Physics of Nanostructures

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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 the 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 [Phys. Rev. Lett. 117, 207203 (2016)PRLTAO0031-900710.1103/PhysRevLett.117.207203] 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 nonlocal spin transport experiments.

Original language	English
Article number	144420
Pages (from-to)	1-11
Journal	Physical Review B
Volume	95
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.95.144420
Publication status	Published - 14 Apr 2017

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AU - Shen, K.

AU - Kikkawa, T.

AU - Uchida, K.I.

AU - Qiu, Z.

AU - Saitoh, E.

AU - Duine, R.A.

AU - Bauer, G.E.W.

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Magnon-polaron transport in magnetic insulators

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