Motion and stability of chiral domain walls driven by non-gradient spin torques: Antiferromagnets and ferromagnets compared

Abstract We present a comparative study on the ferromagnetic and antiferromagnetic chiral domain walls under non-gradient spin torques by collective coordinates method. Based on the steady solutions, the stable chiral walls are picked out by linear stability analysis. We find that the spin torques drive the antiferromagnetic wall more quickly and stable than the ferromagnetic one. For the antiferromagnetic wall, the velocity is proportional to the exchange interaction, while Dzyaloshinskii-Moriya interaction for the ferromagnetic wall. Due to the strongness of exchange interaction, the antiferromagnetic wall propagates much faster than the ferromagnetic one. In addition, the antiferromagnetic wall remains the Neel type, while the ferromagnetic wall switches to a Bloch type with the current increasing. Finally, Dzyaloshinskii-Moriya interaction influences the motion direction of antiferromagnetic wall, but has no effect on the magnitude of velocity. For ferromagnetic walls, it determines the magnitude of velocity.