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In this work, we investigate single-shot all-optical switching (AOS) inTb/Co/Gd/Co/Tb multilayers in an attempt to establish AOS in syntheticferrimagnets with high perpendicular magnetic anisotropy. In particular, westudy the effect of varying Tb thicknesses to disentangle the role of the tworare earth elements. Even though the role of magnetic compensation has beenconsidered to be crucial, we find that the threshold fluence for switching islargely independent of the Tb content. Moreover, we identify the timescale forthe magnetization to cross zero to be within the first ps after laserexcitation using time-resolved MOKE. We conclude that the switching is governedmostly by interactions between Co and Gd.

Ultrafast single-pulse all-optical switching in synthetic ferrimagnetic Tb/Co/Gd multilayers