Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 30: Skyrmions II

MA 30.9: Talk

Wednesday, March 20, 2024, 17:30–17:45, EB 301

Unveiling the origin of square skyrmion lattice in GdRu₂Si₂ and effect of uniaxial pressure: Insights from theory — Rohit Pathak¹, Sagar Sarkar¹, Olle Eriksson^1,2, and •Vladislav Borisov¹ — ¹Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden — ²Wallenberg Initiative Materials Science for Sustainability, Uppsala University, 75121 Uppsala, Sweden

The miniaturization of skyrmion holds promise for high-density memory technology applications [1]. This study delves into the magnetic properties of the GdRu₂Si₂ alloy, experimentally known to host nanometer-sized square skyrmion lattices [2]. Employing the first-principle density functional theory (DFT) [3] and atomistic spin dynamics simulations [4], we aim to understand the microscopic origins of the formation of the skyrmion lattice. Our investigation reveals that the interplay between frustration in exchange interactions and uniaxial anisotropy plays an essential role here. Additionally, we intend to explore the impact of uniaxial pressure on exchange interactions and magnetic anisotropy, thereby examining alterations to the magnetic phase diagram. [1] Göbel, B. et al., Phys. Rep. 895, 1*28 (2021). [2] Khanh, N. D. et al., Nat. Nanotechnol. 15, 444*449 (2020) [3] Wills, J. M. et al. Full-Potential Electronic Structure Method (Springer, 2010) [4] Eriksson et al. Atomistic Spin Dynamics: Foundations and Applications (Oxford University Press, 2017). This work was financially supported by the Knut and Alice Wallenberg (KAW), Göran Gustafsson, and Carl Tryggers Foundations.

Keywords: Skyrmion lattice; Atomistic spin dynamics simulations