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MA: Fachverband Magnetismus

MA 12: Magnetization Dynamics and Damping

MA 12.1: Vortrag

Dienstag, 18. März 2025, 09:30–09:45, H19

Oscillatory dynamics of strongly coupled magnetic domain walls in three-dimensional chiral nanostructures — •Pamela Morales Fernández^1,2, 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. Donnelly^1,9 — 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