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Probing optical spin-currents using THz spin-waves in noncollinear magnetic bilayers by Lichtenberg, Tom; Beens, Maarten; Jansen, Menno H.; Duine, Rembert A.; Koopmans, Bert is a scholarly article available to read on EtoBox.

What is Probing optical spin-currents using THz spin-waves in noncollinear magnetic bilayers about?

Optically induced spin currents have proven to be useful in spintronics applications, allowing for sub-ps all-optical control of magnetization. However, the mechanism responsible for their generation is still heavily debated. Here we use the excitation of spin-current induced THz spin-waves in noncollinear bilayer structures to directly study optical spin-currents in the time domain. We measure a significant laser-fluence dependence of the spin-wave phase, which can quantitatively be explained assuming the spin current is proportional to the time derivative of the magnetization. Measurements of the absolute spin-wave phase, supported by theoretical calculations and micromagnetic simulations, suggest that a simple ballistic transport picture is sufficient to properly explain spin transport in our experiments and that the damping-like optical STT dominates THz spin-wave generation. Our findings suggest laser-induced demagnetization and spin-current generation share the same microscopic origin.

Author

Lichtenberg, Tom; Beens, Maarten; Jansen, Menno H.; Duine, Rembert A.; Koopmans, Bert

Published

2021

Language

EN