SKM 2023 – scientific programme

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MA: Fachverband Magnetismus

MA 47: Skyrmions IV

MA 47.1: Talk

Friday, March 31, 2023, 09:30–09:45, HSZ 04

Systematic parameter study of magnetic skyrmions and antiskyrmions stabilised by exchange interactions — •Stephan von Malottki and Geoffroy Hautier — Thayer School of Engineering at Dartmouth College, Hanover, NH, USA

It is a major ongoing task to optimize the thermal stability of magnetic skyrmions (Sk) and antiskyrmions (ASk), which is in particular limited for sub-10 nm Sk and ASk in 2D magnetic materials. We focus on a stabilisation of Sk and ASk by exchange frustration [1] and higher order exchange interactions (HOI) [2]. We explore the large interaction parameter space of the atomistic Heisenberg model, consisting of exchange interaction beyond nearest neighbours, DMI, magnetocrystalline anisotropy and HOI by means of highly automatised energetic optimisation and geodesic nudged elastic band method (GNEB) simulations. Here we present the resulting sizes and energy barriers for SK and ASK in ferromagnetic and antiferromagnetic lattices with hexagonal and square geometry. This enables us to identify systematically the areas of parameters space in which metastable Sk and ASk can exist and how much their energy barriers can be enhanced in the framework of the atomistic extended Heisenberg model beyond nearest neighbours.

[1] S. von Malottki et al., Sci. Rep. 7, 12299 (2017)

[2] S. Paul et al., Nat. Commun. 11, 4756 (2020)