SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 23: Poster Magnetism I

MA 23.4: Poster

Dienstag, 28. März 2023, 17:00–19:00, P1

Skyrmionic spin structures in layered Fe5GeTe2 up to room temperature — •Maurice Schmitt¹, Thibaud Denneulin², András Kovács², Tom Saunderson^1,3, Philipp Rüßmann^3,4, Aga Shahee¹, Tanja Scholz⁵, Amir Tavabi², Martin Gradhand^1,6, Phivos Mavropoulos⁷, Bettina Lotsch^5,8, Rafal Dunin-Borkowski², Yuriy Mokrousov^1,3, Stefan Blügel³, and Mathias Kläui^1,9 — ¹JGU Mainz — ²Ernst Ruska-Centre, Jülich — ³Peter Grünberg Institut and Institute for Advanced Simulation, Jülich — ⁴University of Würzburg — ⁵Max Planck Institute for Solid State Research, Stuttgart — ⁶University of Bristol — ⁷University of Athens — ⁸LMU, München — ⁹NTNU, Trondheim

The role of the crystal lattice, temperature and magnetic field for the spin structure formation in the 2D van der Waals magnet Fe5GeTe2 with magnetic ordering up to room temperature is a key open question. Using Lorentz transmission electron microscopy, we experimentally observe topological spin structures up to room temperature in the metastable pre-cooling and stable post-cooling phase of Fe5GeTe2. Over wide temperature and field ranges, skyrmionic magnetic bubbles form without preferred chirality, which is indicative of centrosymmetry. These skyrmions can be observed even in the absence of external fields. To understand the complex magnetic order in Fe5GeTe2, we compare macroscopic magnetometry characterization results with microscopic density functional theory and spin-model calculations. Our results show that even up to room temperature, topological spin structures can be stabilized in centrosymmetric van der Waals magnets.