Spin-Phonon Interaction in Yttrium Iron Garnet

Abstract

Spin-phonon interaction is an important channel for spin and energy relaxation in magnetic insulators. Understanding this interaction is critical for developing magnetic insulator-based spintronic devices. Quantifying this interaction in yttrium iron garnet (YIG), one of the most extensively investigated magnetic insulators, remains challenging because of the large number of atoms in a unit cell. Here, we report temperature-dependent and polarization-resolved Raman measurements in a YIG bulk crystal. We first classify the phonon modes based on their symmetry. We then develop a modified mean-field theory and define a symmetry-adapted parameter to quantify spin-phonon interaction in a phonon-mode specific way for the first time in YIG. Based on this improved mean-field theory, we discover a positive correlation between the spin-phonon interaction strength and the phonon frequency.

arXiv comment12 pages, 4 figures, 1 table; (Supp. Info. 10 pages, 5 figures, 2 tables)

References in corpus (18)

• Magnon-photon-phonon entanglement in cavity magnomechanics
• Magnon spin transport driven by the magnon chemical potential in a magnetic insulator
• Magnon Polarons in the Spin Seebeck Effect
• Probing spin correlations with phonons in the strongly frustrated magnet ZnCr2O4
• Spin - Phonon Coupling in Nickel Oxide Determined from Ultraviolet Raman Spectroscopy
• Supercurrent in a room temperature Bose-Einstein magnon condensate
• Thermal spin dynamics of yttrium iron garnet
• Dissecting spin-phonon equilibration in ferrimagnetic insulators by ultrafast lattice excitation
• Magneto-elastic modes and lifetime of magnons in thin yttrium-iron garnet films
• Magnon-phonon coupling unmasked: a direct measurement of magnon temperature
• Magnetic-induced phonon anisotropy in ZnCr${}_2$O${}_4$ from first principles
• Direct observation of magnon-phonon coupling in yttrium iron garnet
• First-Principles Study of Exchange Interactions of Yttrium Iron Garnet
• Evidence for the role of the magnon energy relaxation length in the Spin Seebeck Effect
• Bottleneck accumulation of hybrid magneto-elastic bosons
• Magnonics: Spin Waves Connecting Charges, Spins and Photons
• Observation of terahertz magnon of Kaplan-Kittel exchange resonance in yttrium-iron garnet by Raman spectroscopy
• Phonon dispersion, Raman spectra and evidence for spin-phonon coupling in MnV${}_2$O${}_4$ from first-principles