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

Journal Article · Tue Mar 17 04:00:00 EDT 2020 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.124.117202· OSTI ID:1609124

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

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.

• Research Organization: Energy Frontier Research Centers (EFRC) (United States). Quantum Materials for Energy Efficient Neuromorphic Computing (Q-MEEN-C); Argonne National Laboratory (ANL)
• Sponsoring Organization: USDOE Office of Science; USDOE Office of Science - Energy Frontier Research Center; Air Force Research Laboratory (AFRL) - Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF); University of Maryland
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1609124
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 11 Vol. 124; ISSN 0031-9007
• Country of Publication: United States
• Language: English