Ultrafast Transport of Laser-Excited Spin-Polarized Carriers in Au/Fe/MgO(001)

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

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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Melnikov, Alexey
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Physics Department, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany;

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Citation

Melnikov, A., Razdolski, I., Wehling, T. O., Papaioannou, E. T., Roddatis, V., Fumagalli, P., et al. (2011). Ultrafast Transport of Laser-Excited Spin-Polarized Carriers in Au/Fe/MgO(001). Physical Review Letters, 107(7): 076601. doi:10.1103/PhysRevLett.107.076601.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-3EA8-0

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.