Direct observation of magnon-phonon coupling in yttrium iron garnet

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

doi:10.1103/physrevb.96.100406

Direct observation of magnon-phonon coupling in yttrium iron garnet

Journal Article · Wed Sep 27 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.96.100406· OSTI ID:1470136

Man, Haoran ^[1]; Shi, Zhong ^[2]; Xu, Guangyong ^[3]; Xu, Yadong ^[4]; Chen, Xi ^[5]; Sullivan, Sean ^[5]; Zhou, Jianshi ^[5]; Xia, Ke ^[6]; Shi, Jing ^[4]; Dai, Pengcheng ^[7]

Rice Univ., Houston, TX (United States)
Univ. of California, Riverside, CA (United States); Tongji University, Shanghai (China)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Univ. of California, Riverside, CA (United States)
Univ. of Texas, Austin, TX (United States)
Beijing Normal University (China)
Rice Univ., Houston, TX (United States); Beijing Normal University (China)

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. In this work, 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.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Robert A. Welch Foundation; US Army Research Office (ARO); National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: SC0012670; SC0012311

OSTI ID:: 1470136

Alternate ID(s):: OSTI ID: 1395197

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 10 Vol. 96; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Direct observation of magnon-phonon coupling in yttrium iron garnet

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