Regensburg 2019 – scientific programme
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MA: Fachverband Magnetismus
MA 41: Magnetic Textures: Statics and Imaging II
MA 41.11: Talk
Thursday, April 4, 2019, 12:15–12:30, H37
Small Skyrmions at room temperature: Realistic skyrmion lifetimes from the atomistic model — •Markus Hoffmann1, Gideon P. Müller1,2, and Stefan Blügel1 — 1Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany — 2Science Institute of the University of Iceland, VR-III, 107 Reykjavík, Iceland
Chiral magnetic skyrmions are of great scientific interest but also of potential relevance in information technology, data storage, processing, and neuromorphic computing. To compete with existing technology, those skyrmions have to fulfill stringent requirements: Long lifetimes at room temperature at sizes smaller than 10 nm. Therefore, a significant effort of the magnetism community lies on the analysis of the stability of such small skyrmions. So far [1,2], mainly the micromagnetic model was employed. Here, we go beyond the micromagnetic limit, using the atomistic Heisenberg-type spin-lattice Hamiltonian. We show that the range and the frustration of magnetic interactions as well as structural aspects provide a bright outlook for lifetime dependence on the materials properties. For this, we perform LLG, GNEB and HTST calculations within our Spirit code [3].
We acknowledge funding from the DARPA TEE program through grant MIPR (#HR0011831554) from DOI.
[1] F. Büttner et al., Sci. Rep. 8, 4464 (2018)
[2] A. Bernand-Mantel et al., SciPost Phys. 4, 27 (2018)
[3] Spirit spin simulation framework, spirit-code.github.io