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Phys Rev Lett. 2011 Aug 12;107(7):076601. Epub 2011 Aug 12.

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

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  • 1Physical Chemistry Department, Fritz-Haber-Institute of the Max Planck Society, Berlin, Germany. melnikov@fhi-berlin.mpg.de


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.

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