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

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.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-000F-3EA8-0 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-0014-997B-A
Genre: Journal Article

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 Creators:
Melnikov, Alexey1, 2, Author           
Razdolski, Ilya3, Author
Wehling, Tim O.4, Author
Papaioannou, Evangelos Th.2, Author
Roddatis, Vladimir5, Author
Fumagalli, Paul2, Author
Aktsipetrov, Oleg3, Author
Lichtenstein, Alexander I.4, Author
Bovensiepen, Uwe2, 6, Author
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Physics Department, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany, ou_persistent22              
3Physics Department, Moscow State University, 119991 Moscow, Russia, ou_persistent22              
4Theoretical Physics Institute, University of Hamburg, Jungiusstrasse 9, 20355 Hamburg, Germany, ou_persistent22              
5NRC “Kurchatov Institute,” place Akademika Kurchatova 1, Moscow, 123182, Russia, ou_persistent22              
6Faculty of Physics, University of Duisburg-Essen, Lotharstrasse 1, 47048 Duisburg, Germany, ou_persistent22              

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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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Language(s): eng - English
 Dates: 2011-08-12
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevLett.107.076601
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Title: Physical Review Letters
  Other : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y., etc. : American Physical Society.
Pages: - Volume / Issue: 107 (7) Sequence Number: 076601 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406