Control of Spin-Wave Damping in YIG Using Spin Currents from Topological Insulators

Aryan Navabi, Yuxiang Liu, Pramey Upadhyaya, Koichi Murata, Farbod Ebrahimi, Guoqiang Yu, Bo Ma, Yiheng Rao, Mohsen Yazdani, Mohammad Montazeri, Lei Pan, Ilya N. Krivorotov, Igor Barsukov, Qinghui Yang, Pedram Khalili, Yaroslav Tserkovnyak, Kang L. Wang

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

Spin waves in insulating materials such as Yttrium Iron Garnet (YIG) can be used for signal propagation and processing using the spin of the electrons rather than transport of their charge. Planar YIG films can be integrated with silicon technology to realize devices such as tunable filters, frequency selective limiters, and signal-to-noise enhancers. However, such films suffer from spin-wave damping, which limits their use in such applications. Here, we show that spin currents in topological insulators (TI) can be used to reduce spin-wave damping. TI supports surface spin currents, potentially making it an efficient source of antidamping torque. We show that in a YIG/Bi2Se3 bilayer, the spin-wave damping rate can be reduced by 60% at a current density of 8×105A/cm2. Furthermore, we show that the damping reduction has a strong dependence on spin-wave frequency and we demonstrate that this dependence arises from nonlinear magnon scattering.

Original languageEnglish (US)
Article number034046
JournalPhysical Review Applied
Volume11
Issue number3
DOIs
StatePublished - Mar 19 2019

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Navabi, A., Liu, Y., Upadhyaya, P., Murata, K., Ebrahimi, F., Yu, G., Ma, B., Rao, Y., Yazdani, M., Montazeri, M., Pan, L., Krivorotov, I. N., Barsukov, I., Yang, Q., Khalili, P., Tserkovnyak, Y., & Wang, K. L. (2019). Control of Spin-Wave Damping in YIG Using Spin Currents from Topological Insulators. Physical Review Applied, 11(3), [034046]. https://doi.org/10.1103/PhysRevApplied.11.034046