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

Autor:	Alekhin, Alexandr, Razdolski, Ilya, Ilin, Nikita, Meyburg, Jan P., Diesing, Detlef, Roddatis, Vladimir, Rungger, Ivan, Stamenova, Maria, Sanvito, Stefano, Bovensiepen, Uwe, Melnikov, Alexey
Rok vydání:	2016
Předmět:	Physics - Optics Condensed Matter - Mesoscale and Nanoscale Physics
Zdroj:	Phys. Rev. Lett. 119, 017202 (2017)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.119.017202
Popis:	Using the sensitivity of magneto-induced second harmonic generation to spin currents (SC), we demonstrate in Fe/Au/Fe/MgO(001) pseudo spin valves the generation of 250 fs-long SC pulses. Their temporal profile indicates that superdiffusive hot electron transport across a sub-100~nm Au layer is close to the ballistic limit and 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 non-thermal spin-dependent Seebeck effect is responsible for the generation of ultrashort SC pulses. We also show that hot electron spins rotate upon interaction with non-collinear magnetization at the Au/Fe interface, which holds high potential for future spintronic devices. Comment: 5 pages, 4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1606.03614 Zobrazit plný text záznamu View this record from Arxiv