Chirality dependent sorting of 360° domain wall in a branch structure

Abstract

We have demonstrated 360° domain wall (DW) sorting in a branch structure based on its chirality. The 360° DW driven by the current-induced spin-transfer torque shows a linear motion with preserved spin texture up to a certain critical current density. Interestingly, the critical current density is shifted towards the higher values when the DW is driven in a branch structure. Above the critical current density, the 360° DW transforms into a novel vortex DW with spin texture different from the conventional vortex DWs. The core of the vortex DW moves transverse to the DW motion and drives the DW motion into one of the branches. Thus, the DWs with opposite chirality moves into different branches facilitating the chirality dependent sorting operation within the branch structure. The velocity of 360° DW changes linearly with increase in the current density values however it is independent of the angle between the two branches.