title: Ultrafast transport of laser-excited spin-polarized carriers in Au/Fe/MgO(001).
abstract: Hot carrier-induced spin dynamics is analyzed in epitaxial Au/Fe/MgO(001) by a time domain approach. We excite a spin current pulse in Fe by 35 fs laser pulses. The transient spin polarization, which is probed at the Au surface by optical second harmonic generation, changes its sign after a few hundred femtoseconds. This is explained by a competition of ballistic and diffusive propagation considering energy-dependent hot carrier relaxation rates. In addition, we observe the decay of the spin polarization within 1 ps, which is associated with the hot carrier spin relaxation time in Au.
authors: Physical Chemistry Department, Fritz-Haber-Institute of the Max Planck Society, Berlin, Germany. melnikov@fhi-berlin.mpg.de
authors: Alexey
authors: A
authors: Melnikov
authors: Ilya
authors: I
authors: Razdolski
authors: Tim O
authors: TO
authors: Wehling
authors: Evangelos Th
authors: ET
authors: Papaioannou
authors: Vladimir
authors: V
authors: Roddatis
authors: Paul
authors: P
authors: Fumagalli
authors: Oleg
authors: O
authors: Aktsipetrov
authors: Alexander I
authors: AI
authors: Lichtenstein
authors: Uwe
authors: U
authors: Bovensiepen