LAUSR

In this paper, we present a new approach to reduce the volatility and chaos of the racetrack based on skyrmions. A multilayer (Pt/Co/Cu/Co) structure is designed, where energy potential wells are created in the upper Co layer because of the magnetostatic interaction between the upper Co layers and the Co rings at the bottom layer. The potential wells can store codes that are denoted by skyrmions or a ferromagnetic state. By periodically injecting out-of-plane and in-plane currents, the codes can be generated and controlled to pass through the potential wells one by one. All the codes can be stored in the potential well without loss and chaos, regardless of whether it is code ‘1’ that is denoted by a skyrmion or it is code ‘0’ that is denoted by a ferromagnetic state. The feasibility of this method is proved by micromagnetic simulations. Our design may provide an effective way to reduce signal volatility in skyrmion-based racetrack memory.