Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 25: Magnetic Imaging and Sensors II
MA 25.13: Vortrag
Mittwoch, 20. März 2024, 12:45–13:00, EB 301
Directly mapping of magnetization dynamics in chiral three-dimensional magnetic nano double helices — •Imelda Pamela Morales Fernandez1, Sandra Ruiz Gomez1, Claudia Fernandez Gonzalez1, Elina Zhakina1, Markus König1, Aurelio Hierro Rodriguez2, Simone Finizio3, Sebastian Wintz4, Claas Abert5, Dieter Suess5, Amalio Fernandez-Pacheco6, and Claire Donnelly1 — 1MPI CPFS, Dresden, Germany — 2Universidad de Oviedo, Spain — 3PSI, Switzerland — 4HZB BESSY II, Germany — 5University of Vienna, Austria — 6TUWien, Austria
The expansion of nanomagnetism into the third dimension provides exciting opportunities beyond the physics of planar systems. Here, we experimentally explore the magnetic properties of three-dimensional double-helix (DH) nanostructures, which can host an exotic magnetic configuration featuring pairs of highly coupled domain walls(CDWs). Here we consider the magnetization dynamics on the nanosecond time-scale within the 3D-DH nanostructure. Specifically, we harness three-dimensional nanofabrication techniques to manufacture cobalt nano-double-helices onto striplines and subject them to high-frequency magnetic field excitations. Utilizing time-resolved scanning transmission X-ray microscopy, we map the magnetization dynamics on the three-dimensional nanostructure in real space, revealing localized enhanced dynamics in the positions of CDWs within the DH conduit, that depend on the geometry of the nanostructure and the excitation. These initial findings provide exciting insight into the physics and opportunities for the future of 3D magnetization dynamics.
Keywords: ultrafast; magnetisation dynamics; three-dimensional nanostructures; 3D; Magnetic imaging