Journal
PHYSICAL REVIEW LETTERS
Volume 119, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.119.017202
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Funding
- Deutsche Forschungsgemeinschaft [ME 3570/1, Sfb 616]
- EU 7th framework program through CRONOS
- EU 7th framework program through ACMOL [280879, 618082]
- Science Foundation Ireland [14/IA/2624, 16/US-C2C/3287]
- Science Foundation Ireland (SFI) [16/US-C2C/3287] Funding Source: Science Foundation Ireland (SFI)
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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.
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