Relativistic Motion of Antiferromagnetic Domain Walls Driven by Spin-Orbit Torques

Antiferromagnetic spintronics is attracting considerable interest nowadays as the antiferromagnet is immune to external magnetic fields [1] and compatible with metal or semiconductor electronic structure [2]. To be used as functional devices, one has to find an efficient driving force to manipulate antiferromagnet spins. The effect of spin transfer torque (STT) on antiferromagnetic spins has been identified [3]. Recently, Hals et. al, [4] reported a theory of STT-induced dynamics of antiferromagnetic domain wall (AF-DW) and found that the DW velocity is proportional to the ratio between the dissipative torque and the damping, as for ferromagnet (FM) DWs.