Magnon-phonon relaxation in yttrium iron garnet from first principles

Abstract

We combine the theoretical method of calculating spin wave excitation with the finite-temperature modeling and calculate the magnon-phonon relaxation time in the technologically important material Yttrium iron garnet (YIG) from first principles. The finite lifetime of magnon excitation is found to arise from the fluctuation of the exchange interaction of magnetic atoms in YIG. At room temperature, the magnon spectra have significant broadening that is used to extract the magnon-phonon relaxation time quantitatively. The latter is a phenomenological parameter of great importance in YIG-based spintronics research. We find that the magnon-phonon relaxation time for the optical magnon is a constant while that for the acoustic magnon is proportional to $1/k^2$ in the long-wavelength regime.

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• Non-Hermitian skin effect in magnetic systems
• First-principles study of magnon-phonon interactions in gadolinium iron garnet
• Observation of terahertz magnon of Kaplan-Kittel exchange resonance in yttrium-iron garnet by Raman spectroscopy
• Long lifetime of thermally-excited magnons in bulk yttrium iron garnet
• Atomistic Simulation of Phonon and Magnon Thermal Transport across the Ferro-Paramagnetic Transition
• Strain-Tunable Magnetic Compensation Temperature of Epitaxial Tb${}_3$Fe${}_5$O${}_{12}$ Thin Films
• Effect of vertex corrections on the enhancement of Gilbert damping in spin pumping into a two-dimensional electron gas
• Ultrafast Optomagnonics in Ferrimagnetic Multi-Sublattice Garnets
• Nonlinear relaxation between magnons and phonons in insulating ferromagnets
• Topological Magnetic Phases and Magnon-Phonon Hybridization in the Presence of Strong Dzyaloshinskii-Moriya Interaction
• Interplay of electron-magnon scattering and spin-orbit induced electronic spin-flip scattering in a two-band Stoner model