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

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

2011-03-28

arxiv.org/abs/1103.5310v1

Physics

Condensed Matter

Materials Science

5 pages, 4 figures

Scientific paper

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.

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