Cascading reconfigurable skyrmion logic devices: simplified architectures for versatile computing systems

Magnetic skyrmions, topologically protected and particle-like spin textures, have emerged as promising candidates for the development of high-density, low-power, and multifunctional spintronic memory and logic devices. In this work, we have employed micromagnetic simulations to demonstrate a significant advancement in skyrmion-based logic device design, emphasizing reconfigurability and architectural simplicity. We have designed AND and OR logic gates by individually controlling the skyrmion motion by tapering the output arm. Furthermore, a single device structure capable of executing both AND and OR logic operations is achieved through the use of voltage-controlled magnetic anisotropy (VCMA) gates, thereby eliminating the need for multiple device types and enhancing fabrication efficiency and scalability. The concept is further extended to achieve reconfigurable NAND/NOR operations through seamless VCMA-driven switching. Additionally, cascaded AND gate architectures are demonstrated to enable reconfigurable AND/OR functionalities. Critical operational regimes have been systematically explored across a wide range of material parameters to ensure robustness and reliability. These findings highlight the potential of skyrmion-based logic devices for advancing energy-efficient and versatile computing technologies.