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MA: Fachverband Magnetismus
MA 29: Skyrmions II
MA 29.7: Vortrag
Mittwoch, 19. März 2025, 16:30–16:45, H20
Imaging Topological Defect Dynamics Mediating 2D Skyrmion Lattice Melting — •Raphael Gruber1, Jan Rothörl1, Simon Fröhlich1, Maarten Brems1, Fabian Kammerbauer1, Maria-Andromachi Syskaki1, Elizabeth Martín Jefremovas1, Sachin Krishnia1, Asle Sudbø2, Peter Virnau1, and Msthias Kläui1 — 1Institute of Physics, JGU Mainz — 2QuSpin, NTNU Trondheim
Two-dimensional (2D) phase transitions are mediated by topological defects, as predicted by KTHNY theory. Using real-time Kerr microscopy, we image the two-step melting of a 2D skyrmion lattice with high spatial and temporal resolution. Skyrmions in low-pinning thin-film systems offer tunability of their size and effective temperature [2,3], allowing us to controllably drive the phase transitions.
Our results reveal the emergence of an intermediate hexatic phase and identify topological defects as the key feature of the melting. We provide new insight into 2D melting dynamics and measure a dislocation diffusion coefficient orders of magnitude higher than skyrmion diffusion. This work highlights skyrmions as a versatile platform for studying phase behavior in 2D systems
[1] Kosterlitz & Thouless, J. Phys. C: Solid State Phys. 5, L124 (1972). [2] Zázvorka et al., Nat. Nanotechnol. 14, 658-661 (2019). [3] Gruber et al., Adv. Mater. 35, 2208922 (2023).
Keywords: Skyrmions; 2D phase transitions; topological defects; Kerr microscopy; KTHNY theory