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Domain wall displacement in Co/Pt thin films induced by not only fs- but alsops-laser pulses is demonstrated using time-resolved magneto-optical Faradayimaging. We evidence multi-pulse helicity-dependent laser-induced domain wallmotion in all-optical switchable Co/Pt multilayers with a laser energy belowthe switching threshold. Domain wall displacement of about 2 nm per 2- ps pulseis achieved. By investigating separately the effect of linear and circularpolarization, we reveal that laser-induced domain wall motion results from acomplex interplay between pinning, temperature gradient and helicity effect.Then, we explore the microscopic origin of the helicity effect acting on thedomain wall. These experimental results enhance the understanding of themechanism of all-optical switching in ultra-thin ferromagnetic films.

Helicity-dependent all-optical domain wall motion in ferromagnetic thin films