Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 22: Thin Films: Coupling Effects and Exchange Bias
MA 22.3: Vortrag
Mittwoch, 20. März 2024, 10:15–10:30, H 2013
Skyrmions stabilization in exchange-biased model systems with compensated, uncompensated, and rough interface — Maryna Pankratova1, Olle Eriksson1, 2, and •Anders Bergman1 — 1Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden — 2Wallenberg Initiative Materials Science for Sustainability, Uppsala University, 75121 Uppsala, Sweden
The exchange bias appears in systems with contacting ferromagnets (FM) and antiferromagnets (AFM). It manifests itself in the shift of the magnetic hysteresis from the symmetric position with regard to the zero external magnetic field. When only one AFM sublattice is presented at the interface, or uncompensated FM-AFM interface, the magnetization of the AFM interface layer is non-zero, therefore, the effective field acts on the FM from the AFM. When both AFM sublattices are presented in the AFM interface layer, i.e. the case of a compensated interface, such an effective field could appear if two sublattices do not completely compensate each other. Recently, it was experimentally shown that this effective field can be used to stabilize skyrmions in zero external magnetic fields.
We perform atomistic spin-dynamics simulations to study skyrmion stabilizations in an exchange-biased FM-AFM bilayer and the impact of the interface roughness on the skyrmions' stabilization. We show that skyrmions and skyrmion lattices can be stabilized in zero external fields. The presence, stability, and chirality of skyrmions can be tuned by the strength of exchange coupling through the interface.
Keywords: Exchange bias; Skyrmions; Ferromagnetic-antiferromagnetic bilayers; Atomistic spin-dynamics