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Article Dans Une Revue Journal of Magnetism and Magnetic Materials Année : 2018

Magnetic skyrmions in confined geometries: Effect of the magnetic field and the disorder

Stefania Pizzini
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Alessandro Sala
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Gilles Gaudin
Jan Vogel
Olivier Boulle

Résumé

We report on the effect of the lateral confinement and a perpendicular magnetic field on isolated room-temperature magnetic skyrmions in sputtered Pt/Co/MgO nanotracks and nanodots. We show that the skyrmions size can be easily tuned by playing on the lateral dimensions of the nanostructures and by using external magnetic field amplitudes of a few mT, which allow to reach sub-100 nm diameters. Our XMCD-PEEM observations also highlight the important role of the pinning on the skyrmions size and stability under an out-of-plane magnetic field. Micromagnetic simulations reveal that the effect of local pinning can be well accounted for by considering the thin film grain structure with local anisotropy variations and reproduce well the dependence of the skyrmion diameter on the magnetic field and the geometry.
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Dates et versions

hal-01764982 , version 1 (20-06-2024)

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Roméo Juge, Soong-Geun Je, Dayane de Souza Chaves, Stefania Pizzini, Liliana D. Buda-Prejbeanu, et al.. Magnetic skyrmions in confined geometries: Effect of the magnetic field and the disorder. Journal of Magnetism and Magnetic Materials, 2018, 455, pp.3 - 8. ⟨10.1016/j.jmmm.2017.10.030⟩. ⟨hal-01764982⟩
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