Regensburg 2025 – scientific programme

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MA: Fachverband Magnetismus

MA 43: Skyrmions III / Non-Skyrmionic Magnetic Textures II

MA 43.8: Talk

Friday, March 21, 2025, 11:15–11:30, H16

Short-pitch skyrmions in layered rare-earth frustrated magnets — •Vladislav Borisov¹, Rohit Pathak¹, Sagar Sarkar¹, Anna Delin^2,3,4, and Olle Eriksson^1,3 — ¹Uppsala University, Sweden — ²KTH Royal Institute of Technology, Stockholm, Sweden — ³Wallenberg Initiative Materials Science for Sustainability (WISE) — ⁴SeRC (Swedish e-Science Research Center), KTH Stockholm, Sweden

While most skyrmionic systems rely on the presence of Dzyaloshinskii-Moriya interaction (DMI), there are a few known compounds, such as GdRu₂Si₂ with 122-type structure, where extremely compact skyrmions around 2 nm are stabilized without DMI, as discovered in recent experiments [1]. Several theory studies, including our recent work [2], suggest the importance of magnetic frustration and local anisotropy for the skyrmion stability. The present work explores further the variety of magnetic phases in other compounds with the 122-type crystal structure using density functional theory and atomistic spin dynamics at finite temperature and applied magnetic field. Various chemical compositions, included those from [3], are considered here and interesting trends for RKKY-like Heisenberg interactions between the rare-earth moments, calculated using magnetic force theorem, and real-space textures are analyzed.

1. N. D. Khanh et al., Nature Nanotech. 15, 444-449 (2020).

2. S. Sarkar et al., arXiv:2409.06736.

3. T. Nomoto, R. Arita, J. Appl. Phys. 133, 150901 (2023).

This work was financially supported by the Knut and Alice Wallenberg (KAW), Göran Gustafsson, and Carl Tryggers Foundations.

Keywords: skyrmion; rare earth; Dzyaloshinskii-Moriya interaction; frustrated magnet; density functional theory