Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 34: Magnetic textures: Transport and dynamics II
MA 34.2: Vortrag
Mittwoch, 3. April 2019, 15:30–15:45, H37
Insight into enhanced stability of nanoscale magnetic skyrmions — •Anastasiya S. Varentsova1, Stephan von Malottki3, Grzegorz Kwiatkowski2, Stefan Heinze3, and Pavel F. Bessarab1,2 — 1ITMO University, St. Petersburg, Russia — 2University of Iceland, Reykjavík, Iceland — 3University of Kiel, Kiel, Germany
Experimental data [1,2] demonstrates that nanoscale magnetic skyrmions are only stable at low temperature, but room temperature stability is required for future applications. Here it is demonstrated by means of transition state theory [3] and atomistic spin Hamiltonian that the stability of nanoscale skyrmions can be enhanced to the desired level by a concerted adjustment of material parameters preserving the skyrmion size [4]. Both increase in the energy barrier and the entropy barrier for the skyrmion collapse contribute to the stabilization, but it is the entropic effect that plays a dominant role, leading to the variation of skyrmion lifetime by more than ten orders of magnitude within the chosen parameter range. The pronounced enhancement of the entropy barrier is explained in terms of magnon-skyrmion bound states.
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P.F. Bessarab et al., Sci. Rep., 8, 3433, (2018).
A.S. Varentsova et al., Nanosyst.:Phys.Chem.Math., 9, 356, (2018).