Researchers find magnetic skyrmions diffuse asymmetrically in structured environments
A research team led by Masahito Mochizuki and Xichao Zhang at Waseda University, working with collaborators from the Hong Kong University of Science and Technology, Los Alamos National Laboratory, the Chinese University of Hong Kong, Nanjing University, and the University of York, has shown that magnetic skyrmions can diffuse asymmetrically when confined to a structured environment, moving more readily in one direction than the other even though their underlying thermal motion is random. The work proposes topology and geometry as a new lever for controlling diffusion, with potential relevance to unconventional, physics-based computing hardware.
Skyrmions are particle-like, topologically protected spin textures that can be nudged into motion by tiny thermal fluctuations, and prior work has documented behaviors, such as wall-guided “Brownian gyromotion,” that ordinary particles don’t exhibit. Directional or asymmetric diffusion of particle-like systems has drawn growing interest for unconventional AI hardware, where geometry rather than circuitry could shape how information propagates. Until now, though, how skyrmions diffuse in structured, chamber-like environments, as opposed to open thin films, had been largely unexplored.
Source: https://www.spintronics-info.com/researchers-find-magnetic-skyrmions-diffuse-asymmetrically-structured
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