Magnon-polaron transport in magnetic insulators

Title

Magnon-polaron transport in magnetic insulators

 Author

Flebus, Benedetta (Universiteit Utrecht)
Shen, K. (TU Delft QN/Bauer Group)
Kikkawa, Takashi (Tohoku University)
Uchida, Ken Ichi (Tohoku University; National Institute for Materials Science; Japan Science and Technology Agency)
Qiu, Zhiyong (Tohoku University)
Saitoh, Eiji (Tohoku University; Japan Atomic Energy Agency)
Duine, Rembert A. (Universiteit Utrecht; Eindhoven University of Technology)
Bauer, G.E. (TU Delft QN/Bauer Group; Tohoku University) ORCID 0000-0002-3615-8673

 Date

2017-04-14

 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.


 To reference this document use:

http://resolver.tudelft.nl/uuid:38a15539-cd66-4ef2-a6e7-a3f7cdcf53d6

 DOI

https://doi.org/10.1103/PhysRevB.95.144420

 ISSN

1098-0121

 Source

Physical Review B (Condensed Matter and Materials Physics), 95 (14)

 Part of collection

Institutional Repository

 Document type

journal article

 Rights

© 2017 Benedetta Flebus, K. Shen, Takashi Kikkawa, Ken Ichi Uchida, Zhiyong Qiu, Eiji Saitoh, Rembert A. Duine, G.E. Bauer
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