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Spin currents can be generated on an ultrafast timescale by excitation of aferromagnetic (FM) thin film with a femtosecond laser-pulse. Recently, it hasbeen demonstrated that these ultrafast spin currents can transport angularmomentum to neighbouring FM layers, being able to change both the magnitude andorientation of the magnetization in the adjacent layer. In this work, both thegeneration and absorption of these optically excited spin currents areinvestigated. This is done using non-collinear magnetic bilayers, i.e. two FMlayers separated by a conductive spacer. Spin currents are generated in a Co/Nimultilayer with out-of-plane (OOP) anisotropy, and absorbed by a Co layer withan in-plane (IP) anisotropy. This behaviour is confirmed by careful analysis ofthe laser-pulse induced magnetization dynamics, whereafter it is demonstratedthat the transverse spin current is absorbed very locally near the injectioninterface of the IP layer (90% within the first approx. 2 nm). Moreover, itwill also be shown that this local absorption results in the excitation of THzstanding spin waves within the IP layer. The dispersion measured for these highfrequency spin waves shows a discrepancy with respect to the theoreticalpredictions, for which a first explanation involving intermixed interfaceregions is proposed. Lastly, the spin current generation is investigated usingdifferent number of repeats for the Co/Ni multilayer, which proves to be ofgreat relevance for identifying the optical spin current generation mechanism.

Absorption and generation of femtosecond laser-pulse excited spin currents in non-collinear magnetic bilayers