Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 3: Focus Session: Novel 3D magnetic spin textures

MA 3.2: Hauptvortrag

Montag, 1. April 2019, 10:00–10:30, H38

Simulations of particlelike states in three-dimensional magnets: chiral skyrmions, bobbers and hopfions — •Filipp N. Rybakov — KTH-Royal Institute of Technology, Stockholm, Sweden

Magnetization vector field of skyrmions in the crystals of chiral magnets look like vortex strings passing through the sample. Skyrmions exhibit particlelike properties and are free to move in the film plane and interact each other as ordinary particles [1]. As the size of the sample grows, skyrmion strings become longer as they are bounded by surfaces. Because of that, they cannot be considered wholly localized in three dimensions (3D). The situation is different for chiral bobbers which represent spin textures entirely localized in 3D and located on the surfaces of volumetric samples or films [2]. They behave like particles, but similar to skyrmions their mobility is restricted to two dimensions because the surface is two-dimensional. The progress in the theory of magnetic solitons, advanced computer simulations together with the development of various experimental techniques providing a full reconstruction of 3D spin textures in crystals allow one to hope for the discovery of truly 3D and intrinsically stable particles which can move in any spatial direction. Such 3D topological solitons are known as hopfions [3].

I will present an overview of recent progress in micromagnetic simulations of all the above solitons.

[1] H. Du et al., PRL 120, 197203 (2018).

[2] F. Zheng et al., Nat. Nanotechnol. 13, 451 (2018).

[3] http://hopfion.com