Ultrafast Transport of Laser-Excited Spin-Polarized Carriers in
Authors:
- Alexey MelnikovAMAlexey Melnikov
- Ilya RazdolskiIRIlya Razdolski
- Tim O. WehlingTWTim O. Wehling
- Evangelos Th. PapaioannouEPEvangelos Th. Papaioannou
- Vladimir RoddatisVRVladimir Roddatis
- Paul FumagalliPFPaul Fumagalli
- Oleg AktsipetrovOAOleg Aktsipetrov
- Alexander I. LichtensteinALAlexander I. Lichtenstein
- Uwe BovensiepenUBUwe Bovensiepen
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- 12 August 2011
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 107 (7) , 076601
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.Keywords
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