Skyrmions as quasi-particles : from dynamics to application in unconventional computing
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Abstract
This dissertation explores the magnetic behavior and manipulation of skyrmions -
topologically protected spin textures in metallic thin films - focusing on their dynamics,
confinement, and application in low-power unconventional computation.
Skyrmion flow in the creep regime was studied in straight and modulated channels,
revealing boundary-dependent velocity profiles in qualitative agreement with
Thiele-based simulations.
Controlled He+ and Ga+ irradiation enabled tuning of magnetic properties and enabled
creating artificial barrier for e.g., skyrmion compression. The experimental
findings of the latter are compared and supported by adapted theoretical models
and simulations.
A key part is the development of a novel reservoir computing (RC) scheme based
on the Brownian dynamics of confined skyrmions. Even in a simplistic confining
geometry like an equilateral triangle, the system performs Boolean logic operations,
even nonlinear logic at ultra-low current densities. Its scalability and potential for
increased complexity make skyrmion-based RC a promising platform for energyefficient,
unconventional computing.