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In spintronics applications, ultrafast spin dynamics have to be controlled atfemtosecond (fs) timescales via fs-laser radiation. At such ultrafasttimescales, the effect of the Gilbert damping factor {\alpha} on ultrafastdemagnetization time should be considered. In previous explorations for therelationship between these two parameters, it was found that the theoreticalcalculations based on the local spin-flip scattering model do not agree withthe experimental results. Here, we find that in Fe81Ga19(FeGa)/Ir20Mn80(IrMn)bilayers, the unconventional IrMn thickness dependence of {\alpha} results fromthe competition between spin currents pumped from the ferromagnetic (FM) FeGalayer to the antiferromagnetic (AFM) IrMn layer and those pumped from the AFMlayer to the FM layer. More importantly, we establish a proportionalrelationship between the change of the ultrafast demagnetization rate and theenhancement of Gilbert damping induced by the spin currents via interfacialspin chemical potential . Our work builds a bridge to connect the ultrafastdemagnetization time and Gilbert damping in ultrafast photo-induced spincurrents dominated systems, which not only explains the disagreement betweenexperimental and theoretical results in the relation of {\tau}_M with {\alpha},but provides further insight into ultrafast spin dynamics as well.

Enhancement of ultrafast demagnetization rate and Gilbert damping driven by femtosecond laser-induced spin currents in Fe81Ga19/Ir20Mn80 bilayers