Peristaltic perpendicular-magnetic-anisotropy racetrack memory based on chiral domain wall motions

The chiral domain wall (DW) motions derived from the spin-orbit interaction have been observed to provide more efficient magnetization switching and a higher propagation speed compared with conventional current-induced DW motions based on the spin transfer torque switching mechanism. In this paper, we present a perpendicular-magnetic-anisotropy racetrack memory based on chiral DW motions. By controlling the propagation direction and speed of different DW configurations, the stored information moves peristaltically along the magnetic nanowire. Mixed simulations have been performed to validate its functionality. Through the analyses in terms of capacity, this spin-orbit interaction based device can achieve as high as 150 bits/nanowire so as to overcome the bottlenecks hindering the realization of large-capacity racetrack memory.