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A skyrmion is a topological particle-like excitation in classical continuum field theory [1-3]. Skyr-mion can be driven by spin-polarized current [4, 5]. However, to move the skyrmion along the central line of a nanotrack by in-plane spin-polarized current requires severe matching between the damping coefficient and the non-adiabatic coefficient, i.e. α is close to β, limiting possible material systems...
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