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Direct Observation of Magnon-Phonon Coupling in Yttrium Iron Garnet



Haoran Man, Zhong Shi, Guangyong Xu, Yadong Xe, Xi Chen, Sean Sullivan, Jianshi Zhou, Ke Xia, Jing Shi, Pengcheng Dai


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 the spin Seeback effect (SSE) voltages have been observed in Pt/YIG and attributed to the 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 they hybridized scattering intensity. These results are different from expectations of conventional spin-lattice coupling, calling for new paradigms to understand the scattering process of magnon-phonon interactions and the resulting magnon-polarons.
Physical Review B


magnon phonon neutron scattering


Man, H. , Shi, Z. , Xu, G. , Xe, Y. , Chen, X. , Sullivan, S. , Zhou, J. , Xia, K. , Shi, J. and Dai, P. (2017), Direct Observation of Magnon-Phonon Coupling in Yttrium Iron Garnet, Physical Review B, [online], (Accessed May 26, 2024)


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Created September 26, 2017, Updated October 12, 2021