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Femtosecond Spin Current Pulses Generated by the Nonthermal Spin-Dependent Seebeck Effect and Interacting with Ferromagnets in Spin Valves

MPG-Autoren
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Alekhin,  Alexandr
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Razdolski,  Ilya
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Ilin,  Nikita
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Melnikov,  Alexey
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Institute of Physics, Martin Luther University Halle-Wittenberg;

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PhysRevLett.119.017202.pdf
(Verlagsversion), 957KB

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Zitation

Alekhin, A., Razdolski, I., Ilin, N., Meyburg, J. P., Diesing, D., Roddatis, V., et al. (2017). Femtosecond Spin Current Pulses Generated by the Nonthermal Spin-Dependent Seebeck Effect and Interacting with Ferromagnets in Spin Valves. Physical Review Letters, 119(1): 017202. doi:10.1103/PhysRevLett.119.017202.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-002D-A8EB-0
Zusammenfassung
Using the sensitivity of optical second harmonic generation to currents, we demonstrate the generation of 250-fs long spin current pulses in Fe/Au/Fe/MgO(001) spin valves. The temporal profile of these pulses indicates ballistic transport of hot electrons across a sub-100 nm Au layer. The pulse duration is primarily determined by the thermalization time of laser-excited hot carriers in Fe. Considering the calculated spin-dependent Fe/Au interface transmittance we conclude that a nonthermal spin-dependent Seebeck effect is responsible for the generation of ultrashort spin current pulses. The demonstrated rotation of spin polarization of hot electrons upon interaction with noncollinear magnetization at Au/Fe interfaces holds high potential for future spintronic devices.