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MA: Fachverband Magnetismus

MA 16: Skyrmions I

MA 16.11: Vortrag

Dienstag, 10. März 2026, 12:15–12:30, HSZ/0004

MULTISTABLE SKYRMIONS IN THIN NANODOTS — •Mateusz Zelent^1,2 and Maciej Krawczyk² — ¹FACHBEREICH PHYSIK AND LANDESFORSCHUNGSZENTRUM OPTIMAS, RHEINLAND-PFÄLZISCHE TECHNISCHE UNIVERSITÄT KAISERSLAUTERN-LANDAU, 67663 KAISERSLAUTERN, GERMANY — ²Faculty of Physics and Astronomy, Adam Mickiewicz University, Poznan, ul. Uniwersytetu Poznańskiego 2, Poznan, Poland

We present a new method for controlling and manipulating magnetic skyrmions in ultrathin multilayer structures by employing spatially tailored magnetostatic fields produced by ferromagnetic rings. Through a combination of analytical calculations and micromagnetic simulations, we demonstrate that the stray field generated by a Co/Pd ferromagnetic ring with perpendicular magnetic anisotropy can markedly increase the stability of skyrmions in an Ir/Co/Pt nanodot even when the Dzyaloshinskii Moriya interaction is entirely absent. Our analysis reveals a multistable behaviour, in which skyrmions can exist with two or even three distinct diameters, depending on the magnetization direction of the ring. The associated energy barriers separating these states are substantial, indicating possible applications in binary or multilevel magnetic data storage. We further show that transitions between these states can be triggered in a controlled and robust manner using short magnetic-field pulses. Overall, our approach offers a versatile strategy for engineering the magnetostatic energy landscape and designing skyrmion-based devices with customizable stability characteristics.