SKM 2021 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 6: Focus Session: Magnon Polarons - Magnon-Phonon Coupling and Spin Transport (joint session MA/HL)

HL 6.1: Hauptvortrag

Montag, 27. September 2021, 13:30–14:00, H5

Magnon-polarons in magnetic insulators — •Benedetta Flebus — Boston College, Chestnull Hill, USA

We theoretically study the effects of strong magneto-elastic coupling on the transport properties of magnetic insulators. We develop a Boltzmann transport theory for the mixed magnon-phonon modes, i.e., magnon-polarons, and determine transport coefficients of the composite quasi-particles. 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. We discuss how 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.