Optically driven spin pumping mediating collective magnetization dynamics in a spin valve structure

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.

arXiv comment5 pages, 3 figures

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Cited by in corpus (8)

• Optical excitation of propagating magnetostatic waves in an epitaxial Galfenol film by an ultrafast magnetic anisotropy change
• Effect of magnetic anisotropy relaxation on laser-induced magnetization precession in thin galfenol films
• Nonreciprocal spin-wave dynamics in Pt/Co/W/Co/Pt multilayers
• Optical excitation of single- and multi-mode magnetization precession in Galfenol nanolayers
• Nonreciprocal collective magnetostatic wave modes in geometrically asymmetric bilayer structure with nonmagnetic spacer
• Ultrafast all-optical generation of pure spin and valley currents
• Ultrafast optical observation of spin-pumping induced dynamic exchange coupling in ferromagnetic semiconductor/metal bilayer
• Nanophotonic structures with optical surface modes for tunable spin current generation