期刊
PHYSICAL REVIEW LETTERS
卷 124, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.117202
关键词
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资金
- U.S. DOE, Office of Science, Office of Basic Energy Sciences, Materials Science and Engineering Division [DE-AC02-06CH11357]
- Quantum Materials for Energy Efficient Neuromorphic Computing, an Energy Frontier Research Center - U.S. DOE, Office of Science
- AFOSR [FA9550-19-1-0254]
- NIST Center for Nanoscale Science and Technology through the University of Maryland [70NANB14H209]
- NSF [NSF-DMR1411160]
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/root t(Py), verifying the prediction by the coupled Landau-Lifshitz equations.
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