Regensburg 2025 – scientific programme

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MA: Fachverband Magnetismus

MA 41: Poster III

MA 41.36: Poster

Thursday, March 20, 2025, 15:00–17:30, P3

Minimizing pinning of magnetic skyrmions in multilayer thin films — •Alen John^1,2, Maria Andromachi Syskaki^1,2, Jürgen Langer², Gerhard Jakob¹, and Mathias Kläui¹ — ¹Institute of Physics, Johannes Gutenberg University Mainz, 55128 Mainz, Germany — ²Singulus Technologies AG, 63796 Kahl am Main, Germany

Topological solitons, such as skyrmions, have attracted widespread attention due to their potential applications in unconventional computing and sensing. In this work, we present an optimization process for creating and stabilizing magnetic skyrmions with low pinning in multilayer thin films, using magnetron sputtering. We investigate Ta/CoFeB/MgO stacks with perpendicular magnetic anisotropy, systematically varying deposition parameters like sputter power and pressure to optimize skyrmion formation. Additionally, we introduce a Ta dusting layer between the ferromagnetic and MgO layers to fine-tune the magnetic anisotropy. This approach enables the fabrication of ultra-low pinning skyrmion samples that host room-temperature, thermally diffusing skyrmions[1], which are particularly promising for a range of emerging unconventional computing applications, including reservoir computing [2].

[1] J. Zázvorka et al., Nat. Nanotechnol. 14, 658 (2019) [2] G. Beneke et al., Nat. Commun. 15, 8103 (2024).

Keywords: Skyrmions; magnetron sputtering; skyrmion diffusion; unconventional computing; reservoir computing