Angle-dependent 2D domain wall motion with Dzyaloshinskii-Moriya interaction*

We explore the dependence of the 2D domain wall motion on the incident angle of magnons (spin waves), in the presence of the Dzyaloshinskii-Moriya interaction (DMI). It is found that the domain wall may either be dragged toward or be pushed away from the magnon source, depending on the incident angle of the magnons. This is mainly contributed by the linear momentum absorbed or released by the DMI when magnons pass through the domain wall. In addition, the total internal reflection of magnons beyond a critical incident angle from one side also contributes to the pushing effect. This adds a new mechanism for the magnetic domain wall motion.