Speaker
Description
Magnetic skyrmions are vortex-like spin textures of potential interest for racetrack memories, nanoengines, but also quantum and neuromorphic computing. We consider magnetic skyrmions from localised-spin textures coupled to itinerant electrons. The electron dynamics is described either via Green's functions (NEGF-GKBA) or exact diagonalization, and the localised spins classically or quantum mechanically. We start with skyrmion textures made of classical spins, treated via the Landau–Lifshitz–Gilbert equation, to investigate how electronic spin currents and dilute spin disorder affect skyrmion transport. We show that the skyrmion dynamics is sensitive to the specific form of the spin disorder due to the local spin dynamics around the magnetic impurities. We then move to a quantum-mechanical treatment of the spins, to address the case of quantum nano-skyrmions. The spin-electron exchange is treated at the mean-field level, while Tensor Networks are used for the localised spins. We motivate this approach via exact benchmarks and show by examples that itinerant electrons distinctly affect the properties, including entanglement, of quantum nanoskyrmions. Finally, we discuss ongoing work where the description is extended to include optical cavity photons. Preliminary results are presented and discussed, according to the progress made before the workshop.