Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 12: Skyrmions I
MA 12.1: Vortrag
Montag, 18. März 2024, 15:00–15:15, EB 301
Reversible and Multidirectional Laser-Driven Motion of Chiral Domain Walls and Skyrmion Bubbles — •Kai Litzius1, Jason Bartell2, Lisa-Marie Kern3, Shiyu Zhou4, Daniel Suzuki2, Pooja Reddy2, Felix Steinbach3, Bastian Pfau3, Clemens von Korff Schmising3, Stefan Eisebitt3,5, Geoffrey Beach2, Felix Büttner1,6, and Lucas Caretta4 — 1University of Augsburg, Augsburg, Germany — 2Massachusetts Institute of Technology, Cambridge, USA — 3Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Berlin, Germany — 4Brown University, Providence, USA — 5Technische Universität Berlin, Berlin, Germany — 6Helmholtz-Zentrum Berlin, Berlin, Germany
Noncolinear spin textures, including domain walls and skyrmions, are pivotal for advancing memory and logic applications. Current-driven devices, however, often face challenges in multidimensional motion, demanding intricate fabrication and a comprehensive understanding of spin texture dynamics in multidimensional space. In this study, we investigate the displacement of chiral solitons in ferrimagnetic Pt/GdCo/Ta films using ultrafast laser pulses, allowing for motion over arbitrary distances and directions. We highlight the critical role of the DMI in ensuring reproducible domain wall motion, preventing a destabilization and domain randomization due to precessional dynamics. Furthermore, we find that a negative temperature derivative of the domain wall energy caused by a laser-induced transient thermal gradient can explain the observation. This stresses the importance of the compensation point for light-induced effects in ferrimagnets.
Keywords: domain wall dynamics; skyrmions; light-induced motion; DMI