SKM 2021 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 5: Posters Magnetism II

MA 5.3: Poster

Dienstag, 28. September 2021, 10:00–13:00, P

The Skyrmion Radius Calculator — •Moritz Sallermann, Bernd Zimmermann, Fabian Lux, and Stefan Blügel — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

The skyrmion radius is an important quantity for any skyrmion characterisation, motion and device concept. For technological applications – especially as a promising building block for future information technology – it is essential to determine those materials in which skyrmions assume a typical radius of 10 nm or even less.

We studied the energy contributions of the circular domain wall profile [1] in thin, infinite films of magnetic materials, employing the continuous, micromagnetic approximation. Notably, we also include the exact contribution of the magnetostatic interactions and thus go beyond the commonly applied thin-film approximation. We confirm our findings by comparing them with exact micromagnetic calculations that do not depend on any choice of trial functions. We provide an easy to use and fast online tool, the Skyrmion Radius Calculator [2], which computes an approximation to the skyrmion radius in fractions of a second. It is based on the minimization of the energy of the ansatz profile. The agreement with full micromagnetic simulations can be estimated from the resulting profile parameters and is excellent as long as the skyrmions are of domain-wall character.
Acknowledgement: DFG through SPP-2137 & SFB-1238 (project C1).

[1] F. Büttner, I. Lemesh and G.S. Beach, Sci.Rep., 8(1) (2018)

[2] https://juspin.de/skyrmion-radius/