Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 54: Electron Theory of Magnetism and Micromagnetic Simulations

MA 54.9: Vortrag

Freitag, 11. März 2016, 12:15–12:30, H34

Mechanisms of skyrmion nucleation and annihilation in thin films of chiral magnets — •Pavel Bessarab¹, Gideon Müller², Filipp Rybakov³, Nikolai Kiselev², Stefan Blügel², Lars Bergqvist¹, and Anna Delin¹ — ¹KTH Royal Institute of Technology, Kista, Sweden — ²Forschungszentrum Jülich, Jülich, Germany — ³Institute of Metal Physics, Ekaterinburg, Russia

Theoretical calculations of minimum energy paths (MEPs) for skyrmion nucleation and annihilation in thin films of chiral magnets are presented. MEPs which provide information about the microscopic mechanism and energy barrier of magnetic transitions are identified using a recently developed geodesic nudged elastic band (GNEB) method [1]. The GNEB calculations revealed two mechanisms of the skyrmion annihilation. In ultra-thin films, the MEP corresponds to a radial collapse of the skyrmion. In thicker films, a singularity forms at the film surface and propagates through the film. A maximum is found in the energy barrier for the skyrmion annihilation as a function of film thickness corresponding to a crossover between the two mechanisms. This analysis provides a deeper understanding of skyrmion formation and stability and helps develop ways to control magnetic skyrmions in real nanostructures.

[1] P.F. Bessarab, V.M. Uzdin, H. Jónsson, Comput. Phys. Commun. 196, 335 (2015).