Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 6: Magnetic Imaging Techniques I
MA 6.4: Vortrag
Montag, 9. März 2026, 10:15–10:30, POT/0361
Magnetic Vector Tomography of Thick Chiral Magnets — •Polly Mitchell1, Claire Donnelly1,3, Luke Turnbull2, Jeffrey Neethirajan1, Rikako Yamamoto1,3, Marina Raboni Ferreira1, Burkhard Kaulich2, and Luke Higgins2 — 1MPI CPfS, Dresden, Germany — 2Diamond Light Source, Harwell Campus, Didcot, UK — 3SKCM2 Hiroshima University, Hiroshima, Japan
Complex three-dimensional (3D) textures such as Bloch points, chiral bobbers and hopfions form in chiral magnets through the interplay between Dzyaloshinskii-Moriya and exchange interactions. The 3D nature of such structures provides advantages such as higher degrees of freedom, and the potential for volume-based information encoding. However, the investigation of thick samples presents a number of challenges: first, whether the cancellation of opposing magnetic vectors through the sample will hinder the 3D reconstruction, and second, the high absorption of soft x-ray and electron microscopies. Here we address both challenges, obtaining experimental insight into the 3D configuration of thick chiral magnets. By performing numerical simulations of magnetic vector tomography, we find that increased angular sampling mitigates vector cancellation, allowing accurate high-resolution 3D mapping of samples up to 3µm thick. Following this insight, we harness pre-edge phase soft X-ray ptychography to perform magnetic tomography of a 700nm thick Co8Zn9Mn3 sample. In this way, we are able to recover the 3D magnetisation vector field of a thick chiral sample, demonstrating magnetic tomography as a robust technique to recover complex configurations in thick magnetic systems.
Keywords: X-ray imaging; Spin texture; X-ray magnetic circular dichroism; Chiral magnet; 3D nanomagnetism