SKM 2021 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 7: Skyrmions I (joint session MA/KFM)
MA 7.6: Vortrag
Mittwoch, 29. September 2021, 11:30–11:45, H5
Effects of interlayer exchange on collapse mechanisms and stability of magnetic skyrmions — •Hendrik Schrautzer1,2, Stephan von Malottki1,2, Pavel F. Bessarab2,3, and Stefan Heinze1 — 1Institute of Theoretical Physics and Astrophysics, University of Kiel,Germany — 2University of Iceland, Reykjavik, Iceland — 3ITMO University, St. Petersburg, Russia
Despite the great success of realizing magnetic skyrmions in multilayers, even at room temperature [1], very little is known about the thermal stability of skyrmions in these systems. In this study, we investigate by means of minimum energy path calculations and harmonic transition state theory the skyrmion decay mechanisms, corresponding energy barriers, and thermal collapse rates in systems incorporating several magnetic monolayers as a function of interlayer exchange coupling (IEC). The magnetic interactions within each layer are chosen so as to mimic the well-established Pd/Fe/Ir(111) system parametrized by first principles density functional theory calculations. We find that skyrmions in different monolayers collapse successively (simultaneously) for weak (strong) IEC. For intermediate IEC regime, we find a rich diversity of decay mechanisms, including the chimera collapse stabilized by IEC. Counter-intuitively, an optimal value of the IEC strength exists for a certain stacking of the magnetic layers. It corresponds to maximum skyrmion stability. We use the determined skyrmion collapse mechanisms to ultimately evaluate the skyrmion lifetime in magnetic multilayers.
[1] Moreau-Luchaire, et al., Nat. Nanotechnol. 11, 444 (2016).