Berlin 2018 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 17: Skyrmions III (joint session MA/TT/KFM)
KFM 17.4: Vortrag
Mittwoch, 14. März 2018, 15:45–16:00, EB 301
Optimizing the size of long-lived magnetic skyrmions — Anastasiya Varentsova1, Stephan v. Malottki2, Stefan Heinze2, and •Pavel F. Bessarab1,3 — 1ITMO University, St. Petersburg, Russia — 2University of Kiel, Kiel, Germany — 3University of Iceland, Reykjavik, Iceland
Available experimental data on magnetic skyrmions in various materials demonstrate inverse correlation between the skyrmion size and skyrmion stability: small skyrmions tend to be less stable compared to large ones [1,2]. The question arises how fundamental this trend is and whether it is possible to obtain long-lived magnetic skyrmions at ambient conditions while keeping their size at the nanoscale.
Here, we demonstrate by means of transition state theory [3] and minimum energy path calculations [4] that the skyrmion lifetime at a given temperature is not a unique function of the skyrmion size and that it is possible to systematically tune material parameters so as to minimize the size of skyrmions while keeping their stability at a desired level. Based on this analysis we identify the most promising materials for the use as storage media based on magnetic skyrmions.
[1] W. Jiang et al., Science 349, 283 (2015).
[2] N. Romming et al., Science 341, 636 (2013).
[3] P.F. Bessarab et al., Phys. Rev. B 85, 184409 (2012).
[4] P.F. Bessarab et al., Comput. Phys. Commun. 196, 335 (2015).