Magnon-polaron transport in magnetic insulators

Benedetta Flebus, Ka Shen, Takashi Kikkawa, Ken Ichi Uchida, Zhiyong Qiu, Eiji Saitoh, Rembert A. Duine, Gerrit E.W. Bauer

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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 languageEnglish
Article number144420
Number of pages11
JournalPhysical Review B (Condensed Matter and Materials Physics)
Volume95
Issue number14
DOIs
Publication statusPublished - 14 Apr 2017

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    Flebus, B., Shen, K., Kikkawa, T., Uchida, K. I., Qiu, Z., Saitoh, E., Duine, R. A., & Bauer, G. E. W. (2017). Magnon-polaron transport in magnetic insulators. Physical Review B (Condensed Matter and Materials Physics), 95(14), [144420]. https://doi.org/10.1103/PhysRevB.95.144420