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Using the sensitivity of magneto-induced second harmonic generation to spincurrents (SC), we demonstrate in Fe/Au/Fe/MgO(001) pseudo spin valves thegeneration of 250 fs-long SC pulses. Their temporal profile indicates thatsuperdiffusive hot electron transport across a sub-100~nm Au layer is close tothe ballistic limit and the pulse duration is primarily determined by thethermalization time of laser-excited hot carriers in Fe. Considering thecalculated spin-dependent Fe/Au interface transmittance we conclude that anon-thermal spin-dependent Seebeck effect is responsible for the generation ofultrashort SC pulses. We also show that hot electron spins rotate uponinteraction with non-collinear magnetization at the Au/Fe interface, whichholds high potential for future spintronic devices.

Femtosecond spin current pulses generated by the non-thermal spin-dependent Seebeck effect and interacting with ferromagnets in spin valves