Ultrafast transport of laser-excited spin-polarized carriers in Au/Fe/MgO(001) |
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| Authors: | Melnikov Alexey Razdolski Ilya Wehling Tim O Papaioannou Evangelos Th Roddatis Vladimir Fumagalli Paul Aktsipetrov Oleg Lichtenstein Alexander I Bovensiepen Uwe |
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| Institution: | Physical Chemistry Department, Fritz-Haber-Institute of the Max Planck Society, Berlin, Germany. melnikov@fhi-berlin.mpg.de |
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| 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. |
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