Direct Imaging of Resonant Phonon-Magnon Coupling

Chenbo Zhao, Zhizhi Zhang, Yi Li, Wei Zhang, John E. Pearson, Ralu Divan, Qingfang Liu, Valentine Novosad, Jianbo Wang, Axel Hoffmann

Research output: Contribution to journalArticlepeer-review

Abstract

Detection of phonons is critical for research on the interconversion between resonantly coupled magnons and phonons. Here we report the direct visualization of the resonant coupling of magnons and phonons by microfocused Brillouin light scattering on the Ni/LiNbO3 hybrid heterostructure. The static patterns of surface acoustic wave phonons, originating from the interference between the incident wave ψ0(A0,k,φ0) and reflected wave ψ1(A1,-k,φ1), can be modulated by magnetic field due to the magnon-phonon coupling. By analyzing the information of phonons obtained from Brillouin spectroscopy, the properties of the magnon system (Ni film), e.g., ferromagnetic resonance field and resonance linewidth, can be determined. The results provide spatially resolved information about phonon manipulation and detection in a coupled magnon-phonon system.

Original languageEnglish (US)
Article number014052
JournalPhysical Review Applied
Volume15
Issue number1
DOIs
StatePublished - Jan 2021

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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