Optically excited spin pumping mediating collective magnetization dynamicsin a spin valve structure

Danilov, A.P.; Scherbakov, A.V.; Glavin, B.A.; Linnik, T.L.; Kalashnikova, A.M.; Shelukhin, L.A.; Pattnaik, D.P.; Rushforth, A.W.; Love, C.J.; Cavill, S.A.; Yakovlev, D.R.; Bayer, M.

Abstract

We demonstrate spin pumping, i.e. the generation of a pure spin current by precessing magnetization, without application of microwave radiation commonly used in spin pumping experiments. We use femtosecond laser pulses to simultaneously launch the magnetization precession in each of two ferromagnetic layers of a Galfenol-based spin valve and monitor the temporal evolution of the magnetizations. The spin currents generated by the precession cause a dynamic coupling of the two layers. This coupling has dissipative character and is especially efficient when the precession frequencies in the two layers are in resonance, where coupled modes with strongly different decay rates are formed.

Citation

Danilov, A., Scherbakov, A., Glavin, B., Linnik, T., Kalashnikova, A., Shelukhin, L., Pattnaik, D., Rushforth, A., Love, C., Cavill, S., Yakovlev, D., & Bayer, M. (2018). Optically excited spin pumping mediating collective magnetization dynamicsin a spin valve structure. Physical Review B, 98(6), Article 060406. https://doi.org/10.1103/PhysRevB.98.060406

• Journal Article Type: Article
• Acceptance Date: Jul 20, 2018
• Online Publication Date: Aug 13, 2018
• Publication Date: Aug 13, 2018
• Deposit Date: Jul 25, 2018
• Publicly Available Date: Aug 13, 2018
• Journal: Physical Review B
• Print ISSN: 2469-9950
• Electronic ISSN: 2469-9969
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 98
• Issue: 6
• Article Number: 060406
• DOI: https://doi.org/10.1103/PhysRevB.98.060406
• Public URL: https://nottingham-repository.worktribe.com/output/947376
• Publisher URL: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.98.060406
• Contract Date: Jul 25, 2018