SKM 2021 – scientific programme

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MA: Fachverband Magnetismus

MA 7: Skyrmions I (joint session MA/KFM)

MA 7.8: Talk

Wednesday, September 29, 2021, 12:00–12:15, H5

Optimizing the skyrmion profile for technological applications — •Markus Hoffmann, Sarina Lebs, Moritz Sallermann, and Stefan Blügel — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

Chiral magnetic skyrmions are of great scientific interest and of potential relevance in information technology. Important properties – such as their lifetime, mobility, and robustness with respect to external influences – depend hereby on the specific application. Thus, skyrmion properties must be tuned to outperform existing technologies.

Based on a combination of micromagnetic arguments and atomistic spin-dynamics simulations carried out with Spirit (https://spirit-code.github.io), we investigate the dependence of aforementioned properties on the skyrmion profile, i.e., on the spatial dependence of the magnetization field, and analyze how the skyrmion profile can be tuned to optimize the skyrmion’s properties. To obtain static properties, we perform LLG and GNEB simulations, which provide us the energy barrier and the corresponding saddle point structure, and combine those with HTST calculations to determine the lifetime prefactor [1]. Additionally, we perform LLG simulations to investigate the dynamics of skyrmions, including their velocity as well as the skyrmion Hall angle.

We acknowledge funding from the DARPA TEE program through grant MIPR (#HR0011831554) from DOI, and DFG through SPP-2137 and SFB-1238 (project C1).

[1] M. Hoffmann et al., Phys. Rev. Lett. 124, 247201 (2020).