Direct observation of magnon-phonon coupling in yttrium iron garnet
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The magnetic insulator yttrium iron garnet (YIG) with a ferrimagnetic transition temperature of ∼ 560 K has been widely used in microwave and spintronic devices. Anomalous features in spin Seeback effect (SSE) voltages have been observed in Pt/YIG and attributed to magnon-phonon coupling. Here, we use inelastic neutron scattering to map out low-energy spin waves and acoustic phonons of YIG at 100 K as a function of increasing magnetic field. By comparing the zero and 9.1 T data, we find that instead of splitting and opening up gaps at the spin wave and acoustic phonon dispersion intersecting points, magnon-phonon coupling in YIG enhances the hybridized scattering intensity. These results are different from expectations of conventional spin-lattice coupling, calling for different paradigms to understand the scattering process of magnon-phonon interactions and the resulting magnon polarons.
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Man, Haoran, Shi, Zhong, Xu, Guangyong, et al.. "Direct observation of magnon-phonon coupling in yttrium iron garnet." Physical Review B, 96, no. 10 (2017) American Physical Society: https://doi.org/10.1103/PhysRevB.96.100406.