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

Research output: Contribution to journalArticleAcademicpeer-review

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.
Original languageEnglish
Article number144420
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume95
Issue number14
DOIs
Publication statusPublished - 14 Apr 2017

Keywords

  • Magnetoelastic effect
  • Spin Seebeck effect
  • Spintronics
  • Magnetic insulators

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