Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 46: Poster II
MA 46.17: Poster
Donnerstag, 21. März 2024, 15:00–18:00, Poster C
Coherent X-ray imaging of Nanoscale spin textures in Ferrimagnetic Multilayers — Tamer Karaman1, •Manas R. Patra1,2, Timo Schmidt1, Riccardo Battistelli1,2, Christopher Klose3, Bastian Pfau3, Manfred Albrecht1, and Felix Büttner1,2 — 1University of Augsburg, 86159 Augsburg, Germany — 2Helmholtz-Zentrum Berlin, 14109 Berlin, Germany — 3Max Born Institute, 12489 Berlin, Germany
Chiral rare-earth transition metal ferrimagnets, combining ferromagnetic and antiferromagnetic traits, offer various advantages, including bulk Néel-type Dzyaloshinskii-Moriya interaction (DMI), adjustable anisotropy, and minimal stray fields [1]. Achieving small and yet rapidly moving information-carrying topological spin textures is essential for in-memory and neuromorphic computing technologies [2,3]. This promises to realize high DMI in a thick, compensated material at room temperature. Here we present a coherent x-ray imaging study on Pt/Co/Dy multilayers, which reveals magnetic skyrmions of significant variations in both the size and contrast. While pinning explains size differences, variations in contrast suggest exciting possibilities, such as a 3D spin texture due to a vertical gradient of magnetic properties induced by Dy diffusion or the presence of sub-10-nm-diameter DMI-stabilized skyrmions. This high-resolution imaging holds the promise of uncovering novel physics in the field of nano-magnetism. References: 1. Büttner, F., et al., Sci. Rep. 8, 4464 (2018). 2. Caretta, L. et al., Nat. Nanotechnol. 13, 1154 (2018). 3. Fert, A., et al., Nat. Rev. Mater. 2, 17031 (2017).
Keywords: Ferrimganets; Dzyaloshinskii-Moriya Interaction; skyrmion; Chiral interactions; 3D spin textures