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

Year: 2011
Type: article
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.
DOI: 10.1103/physrevlett.107.076601
Authors: Alexey Melnikov, Ilya Razdolski, Tim O. Wehling, Evangelos Th. Papaioannou, Vladimir Roddatis, Paul Fumagalli, Oleg Aktsipetrov, Alexander I. Lichtenstein, Uwe Bovensiepen
Institutions: Max Planck Society, Fritz Haber Institute of the Max Planck Society, Freie Universität Berlin, Lomonosov Moscow State University, Universität Hamburg, Kurchatov Institute, University of Duisburg-Essen
Language: English
Open Access status: green
OpenAlex ID: W2055630667
FWCI: 7.3
Cites: 25
Cited by: 280
Related to: 9