Coherent Spin Pumping in a Strongly Coupled Magnon-Magnon Hybrid System

Yi Li, Wei Cao, Vivek P. Amin, Zhizhi Zhang, Jonathan Gibbons, Joseph Sklenar, John Pearson, Paul M. Haney, Mark D. Stiles, William E. Bailey, Valentine Novosad, Axel Hoffmann, Wei Zhang

Research output: Contribution to journalArticle

Abstract

We experimentally identify coherent spin pumping in the magnon-magnon hybrid modes of yttrium iron garnet/permalloy (YIG/Py) bilayers. By reducing the YIG and Py thicknesses, the strong interfacial exchange coupling leads to large avoided crossings between the uniform mode of Py and the spin wave modes of YIG enabling accurate determination of modification of the linewidths due to the dampinglike torque. We identify additional linewidth suppression and enhancement for the in-phase and out-of-phase hybrid modes, respectively, which can be interpreted as concerted dampinglike torque from spin pumping. Furthermore, varying the Py thickness shows that both the fieldlike and dampinglike couplings vary like 1/tPy, verifying the prediction by the coupled Landau-Lifshitz equations.

Original languageEnglish (US)
Article number117202
JournalPhysical review letters
Volume124
Issue number11
DOIs
StatePublished - Mar 20 2020
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Li, Y., Cao, W., Amin, V. P., Zhang, Z., Gibbons, J., Sklenar, J., Pearson, J., Haney, P. M., Stiles, M. D., Bailey, W. E., Novosad, V., Hoffmann, A., & Zhang, W. (2020). Coherent Spin Pumping in a Strongly Coupled Magnon-Magnon Hybrid System. Physical review letters, 124(11), [117202]. https://doi.org/10.1103/PhysRevLett.124.117202