Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 12: Skyrmions 1 (joint session MA/KFM)

KFM 12.12: Vortrag

Dienstag, 6. September 2022, 12:30–12:45, H37

Systematic identification and assessment of topological spin textures via saddle point searches — •Hendrik Schrautzer1,2, Grzegorz Kwiatkowski1, Hannes Jónsson1, Pavel F. Bessarab1,3, and Stefan Heinze21University of Iceland, Reykjavik, Iceland — 2Christian-Albrechts-University, Kiel, Germany — 3Linnaeus University, Kalmar, Sweden

Magnetic systems hosting topological textures such as skyrmions have been of great technological and fundamental interest in recent years. The growing zoo [1] of co-existing meta-stable states makes investigation of such systems challenging. Here, we present a methodology combining global optimization based on recursive traversing between energy minima via saddle points on the energy surface [2,3], and harmonic transition state theory. The methodology provides a systematic approach to predict previously unknown metastable states, identify their lifetime at a given temperature and compute kinetics of their mutual transformations. We apply the method to the widely studied Pd/Fe/Ir(111) skyrmionic system, parametrized using density functional theory, and predict a variety of new transition mechanisms and spin textures including skyrmions with chiral kinks [1], which have been unknown so far in this system.
1: V. M. Kuchkin, et al., Phys. Rev. B 102.14 (2020): 144422.
2: A. Pedersen, et al., International Workshop on Applied Parallel Computing (pp. 34-44) (2010). Springer, Berlin, Heidelberg.
3: G. P. Müller et al., Phys. Rev. Lett. 121.19 (2018): 197202

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