Man, HaoranShi, ZhongXu, GuangyongXu, YadongChen, XiSullivan, SeanZhou, JianshiXia, KeShi, JingDai, Pengcheng2017-10-192017-10-192017Man, Haoran, Shi, Zhong, Xu, Guangyong, et al.. "Direct observation of magnon-phonon coupling in yttrium iron garnet." <i>Physical Review B,</i> 96, no. 10 (2017) American Physical Society: https://doi.org/10.1103/PhysRevB.96.100406.https://hdl.handle.net/1911/97798The 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.engArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.Journal articleDirect_observation_magnon-phonon_couplinghttps://doi.org/10.1103/PhysRevB.96.100406