Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 12: Magnetization Dynamics and Damping
MA 12.1: Talk
Tuesday, March 18, 2025, 09:30–09:45, H19
Oscillatory dynamics of strongly coupled magnetic domain walls in three-dimensional chiral nanostructures — •Pamela Morales Fernández1,2, I. Konstantinos Douveas3, S. Ruiz Gómez4, E. Zhakina1, L. Turnbull1, M. König1, A. Hierro Rodríguez5, N. Leo6, S. Finizio7, S. Wintz8, C. Abert3, D. Suess3, A. Fernández Pacheco2, and C. Donnelly1,9 — 1MPI CPFS, Germany — 2TU Viena, Austria — 3University of Vienna, Austria — 4ALBA Synchrotron, Spain — 5Universidad de Oviedo, Spain — 6Loughborough University, UK — 7PSI, Switzerland — 8BESSY II, Germany — 9Hiroshima University, Japan.
The expansion of nanomagnetism into three dimensions opens opportunities for new topological textures, curvilinear effects, and exotic magnetization dynamics. Here, we investigate the magnetization dynamics in 3D double-helix nanostructures, which host strongly coupled domain wall pairs formed through the interplay of shape anisotropy, chirality, and inter-helix magnetostatic interactions. Using direct 3D nanofabrication techniques, cobalt nano double helices are grown on top of microwave antennas and exposed to GHz magnetic fields. Time-resolved scanning transmission X-ray microscopy reveals enhanced dynamics in the area of the coupled domain walls within the helical conduits. Observed dynamics depend on the geometrical parameters of the system and excitation frequency, matching with micromagnetic simulations that reveal additional higher-frequency modes beyond the reach of the experimental technique. This work provides insights into the physics of 3D nanomagnetism, advancing control for future technologies.
Keywords: Magnetization dynamics; 3D nano magnetism; Three-simenaisonal magnetism; Magnetic texture; Exotic