Ultrafast laser-excited spin transport in Au/Fe/MgO(001): Relevance of the Fe layer thickness
A. Alekhin, D. Bürstel, A. Melnikov, D. Diesing, and U. Bovensiepen;
in: Ultrafast Magnetism I - Proceedings of Ultrafast Magnetism Conference (UMC2013),
Strasbourg, France, October 28 – November 1, 2013;
Springer Proceedings in Physics, 159, 241-243 (2015), pp. 3;
Propagation dynamics of spin-dependent optical excitations is investigated by back-pump front-probe experiments in Au/Fe/MgO(001). We observe a decrease for all pump-probe signals detected at the Au surface, if the Fe thickness in increased. Relaxation processes within Fe limit the emission region of ballistic spins at the Fe/Au interface to ~1 nm.
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