Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 20: Focus Session: Revealing Multidimensional Spin Textures and their Dynamics via X-rays and Electrons
MA 20.4: Invited Talk
Wednesday, September 7, 2022, 11:15–11:45, H37
Imaging the 3D magnetic texture of skyrmion tubes and approaches towards determining their Hall signature — •B. Rellinghaus1, S. Schneider1,2, D. Wolf2, U.K. Rössler2, M. Schmidt3, A. Kovács4, R.E. Dunin-Borkowski4, D. Pohl1, A. Thomas2, D. Krieger2, B. Büchner2, and A. Lubk2 — 1DCN, cfaed, TU Dresden, Germany — 2IFW Dresden, Germany — 3MPI CPfS, Dresden, Germany — 4FZ Jülich, Germany
Despite the large interest in magnetic skyrmions, their 3D magnetic texture when being extended to skyrmion tubes (SkTs) in volume samples is largely unknown. We have therefore determined the magnetic structure of SkTs using low temperature holographic vector field electron tomography in an external magnetic field [1]. The resulting high-resolution 3D magnetic images reveal deviations from a homogeneous Bloch character, a collapse of the skyrmion texture near surfaces, the coexistence of longitudinal and transverse skyrmion textures, and a correlated axial modulation of the SkTs. Spatially resolved energy density maps calculated from the experimental magnetic induction data prove that these magnetic solitons are stabilized by the Dzyaloshinskii-Moryia interaction, which overcompensates the exchange energy in the centers of the tubes. In order to correlate the occurrence of skyrmionic structures with anomalies in their magneto-transport properties, we have devised a setup for the in-situ measurement of the Hall effect in a transmission electron microscope, first results of which will be highlighted. The work is gratefully supported by DFG within SPP 2137.
[1] D. Wolf et al., Nature Nanotechnology 17 (2021) 250.