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Magnetic racetrack memory has significantly evolved and developed since itsfirst experimental verification and is considered as one of the most promisingcandidates for future high-density on-chip solid state memory. However, thelack of a fast and precise magnetic domain wall (DW) shifting mechanism and therequired extremely high DW motion (DWM) driving current both make the racetrackdifficult to commercialize. Here, we propose a method for coherent DWM that isfree from above issues, which is driven by chirality switching (CS) and anultralow spin-orbit-torque (SOT) current. The CS, as the driving force of DWM,is achieved by the sign change of DM interaction which is further induced by aferroelectric switching voltage. The SOT is used to break the symmetry when themagnetic moment is rotated to the Bloch direction. We numerically investigatethe underlying principle and the effect of key parameters on the DWM throughmicromagnetic simulations. Under the CS mechanism, a fast (102 m/s), ultralowenergy (5 attojoule), and precisely discretized DWM can be achieved.Considering that skyrmions with topological protection and smaller size arealso promising for future racetrack, we similarly evaluate the feasibility ofapplying such a CS mechanism to a skyrmion. However, we find that the CS onlycauses it to "breathe" instead of moving. Our results demonstrate that the CSstrategy is suitable for future DW racetrack memory with ultralow powerconsumption and discretized DWM.

Ultralow power and shifting-discretized magnetic racetrack memory device driven by chirality switching and spin current