Ultrafast transport of laser-excited spin polarized carriers in
  Au/Fe/MgO(001)

Bovensiepen, Uwe; Lichtenstein, Alexander I.; Aktsipetrov, Oleg; Fumagalli, Paul; Roddatis, Vladimir; Papaioannou, Evangelos Th.; Wehling, Tim O.; Razdolski, Ilya; Melnikov, Alexey S.

doi:10.1103/PhysRevLett.107.076601

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Ultrafast transport of laser-excited spin polarized carriers in Au/Fe/MgO(001)

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Author(s): Alexey Melnikov , Ilya Razdolski , Tim O. Wehling , Evangelos Th. Papaioannou , Vladimir Roddatis , Paul Fumagalli , Oleg Aktsipetrov , Alexander I. Lichtenstein , Uwe Bovensiepen

Publication date Created: 28 March 2011

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Abstract

A time domain approach to probe hot carrier-induced spin dynamics is demonstrated. The experiments are performed in epitaxial Au/Fe/MgO(001), where spin-polarized hot carriers are excited in the Fe layer by 35 fs laser pulses. They propagate to the Au surface where the transient spin polarization is detected by magneto-induced second harmonic generation. Different energies of majority and minority hot carriers excited in the exchange-split Fe band structure lead to their spindependent lifetimes in Au. Accordingly, two spin-polarized current contributions which propagate superdiffusively at different velocities result in a spin current pulse of about 100 fs duration.