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Light transition metals have recently emerged as a sustainable material classfor efficient spin-charge interconversion. We report measurements ofcurrent-induced spin-orbit torques generated by Ni$_{1-x}$Cu$_{x}$ alloys inperpendicularly magnetized ferrimagnetic Gd/Fe multilayers. We show that thespin-orbit torque efficiency of Ni$_{1-x}$Cu$_{x}$ increases with the Ni/Cuatomic ratio, reaching values comparable to those of Pt for Ni$_{55}$Cu$_{45}$.Furthermore, we demonstrate magnetization switching of a 20-nm-thick Gd/Femultilayer with a threshold current that decreases with increasing Niconcentration, similar to the spin-orbit torque efficiency. Our findings showthat Ni$_{1-x}$Cu$_{x}$$-$based magnetic heterostructures allow for efficientcontrol of the magnetization by electric currents.

Spin-orbit torques and magnetization switching in Gd/Fe multilayers generated by current injection in NiCu alloys