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Despite the potential advantages of information storage inantiferromagnetically coupled materials, it remains unclear whether one cancontrol the magnetic moment orientation efficiently because of the cancelledmagnetic moment. Here, we report spin-orbit torque induced magnetizationswitching of ferrimagnetic Co1-xTbx films with perpendicular magneticanisotropy. Current induced switching is demonstrated in all of the studiedfilm compositions, including those near the magnetization compensation point.The spin-orbit torque induced effective field is further quantified in thedomain wall motion regime. A divergent behavior that scales with the inverse ofmagnetic moment is confirmed close to the compensation point, which isconsistent with angular momentum conservation. Moreover, we also quantify theDzyaloshinskii-Moriya interaction energy in the Ta/Co1-xTbx system and we findthat the energy density increases as a function of the Tb concentration. Thedemonstrated spin-orbit torque switching, in combination with the fast magneticdynamics and minimal net magnetization of ferrimagnetic alloys, promisesspintronic devices that are faster and with higher density than traditionalferromagnetic systems.

Spin-Orbit Torque Efficiency in Compensated Ferrimagnetic Cobalt-Terbium Alloys