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Spin-transfer torque (STT) and spin-orbit torque (SOT) are spintronicphenomena allowing magnetization manipulation using electrical currents. Beyondtheir fundamental interest, they allow developing new classes of magneticmemories and logic devices, in particular based on domain wall (DW) motion. Inthis work, we report the study of STT driven DW motion in ferrimagneticmanganese nickel nitride (Mn4-xNixN) films, in which a fine adjustment of theNi content allows setting the magnetic compensation at room temperature. Thereduced magnetization, combined with the large spin polarization of conductionelectrons, strongly enhances the STT so that domain wall velocities approaching3000 m/s can be obtained for Ni compositions close to the compensation point.In addition, a reversal of the domain wall motion direction is observed whenthe magnetic compensation composition is crossed. This striking feature,related to the change of direction of the spin polarization with respect tothat of the net magnetization, is clarified by ab initio band structurecalculations.

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Current-driven domain wall dynamics in ferrimagnetic Ni-doped Mn4N films  : very large domain wall velocities and reversal of motion direction across  the magnetic compensation point