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

Abstract

Spin-transfer torque (STT) and spin-orbit torque (SOT) are spintronic phenomena allowing magnetization manipulation using electrical currents. Beyond their fundamental interest, they allow developing new classes of magnetic memories and logic devices, in particular based on domain wall (DW) motion. In this work, we report the study of STT driven DW motion in ferrimagnetic manganese nickel nitride (Mn4-xNixN) films, in which a fine adjustment of the Ni content allows setting the magnetic compensation at room temperature. The reduced magnetization, combined with the large spin polarization of conduction electrons, strongly enhances the STT so that domain wall velocities approaching 3000 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 when the magnetic compensation composition is crossed. This striking feature, related to the change of direction of the spin polarization with respect to that of the net magnetization, is clarified by ab initio band structure calculations.

arXiv comment24 pages, 4 figures

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Cited by in corpus (7)

• Electrical control of magnetism by electric field and current-induced torques
• Dynamics of hybrid magnetic skyrmion driven by spin-orbit torque in ferrimagnets
• Interfacial Mixing Effect in a Promising Skyrmionic Material: Ferrimagnetic Mn${}_4$N
• Ionically-Driven Synthesis and Exchange Bias in Mn${}_4$N/MnN${}_x$ Heterostructures
• High-mobility inertial domain walls driven by spin-transfer torque in a ferrimagnetic spinel oxide
• Energy-efficient spin Hall nano-oscillators using near-compensated CoGd ferrimagnets
• Rare-earth-free noncollinear metallic ferrimagnets Mn4-xZxN with compensation at room temperature