  While current-induced spin-orbit torques (SOTs) have been extensively studied
in ferromagnets and antiferromagnets, ferrimagnets have been less studied. Here
we report the presence of enhanced spin-orbit torques resulting from negative
exchange interaction in ferrimagnets. The effective field and switching
efficiency increase substantially as CoGd approaches its compensation point,
giving rise to 9 times larger spin-orbit torques compared to that of
non-compensated one. The macrospin modelling results also support efficient
spin-orbit torques in a ferrimagnet. Our results suggest that ferrimagnets near
compensation can be a new route for spin-orbit torque applications due to their
high thermal stability and easy current-induced switching assisted by negative
exchange interaction.

Materials Science