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We study the ultrafast demagnetization of Ni/NiMn and Co/NiMnferromagnetic/antiferromagnetic bilayer systems after excitation by a laserpulse. We probe the ferromagnetic order of Ni and Co using magnetic circulardichroism in time-resolved pump--probe resonant X-ray reflectivity. Tuning thesample temperature across the antiferromagnetic ordering temperature of theNiMn layer allows to investigate effects induced by the magnetic order of thelatter. The presence of antiferromagnetic order in NiMn speeds up thedemagnetization of the ferromagnetic layer, which is attributed tobidirectional laser-induced superdiffusive spin currents between theferromagnetic and the antiferromagnetic layer.

Accelerating the laser-induced demagnetization of a ferromagnetic film by antiferromagnetic order in an adjacent layer