SKM 2021 – scientific programme
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MA: Fachverband Magnetismus
MA 7: Skyrmions I (joint session MA/KFM)
MA 7.2: Talk
Wednesday, September 29, 2021, 10:30–10:45, H5
In the eye of the storm – A high resolution view at the details of the 3D magnetic texture of Skymions tubes — S. Schneider1,2, D. Wolf2, A. Lubk2, U.K. Rößler1, A. Kovács3, M. Schmidt4, R.E. Dunin-Borkowski3, B. Büchner2, and •B. Rellinghaus1 — 1Dresden Center for Nanoanalysis, TU Dresden, Dresden, Germany — 2IFW Dresden, Dresden, Germany — 3FZ Jülich, Jülich, Germany — 4MPI CPfS, Dresden, Germany
Low temperature holographic vector field electron tomography in an external magnetic field was used to quantitatively reconstruct the 3D magnetic texture of skyrmion tubes (SkTs) in an FeGe needle [1]. The resulting high-resolution 3D magnetic images reveal various previously unseen details of the SkTs in FeGe. Our findings include the occurrence of local deviations from a homogeneous Bloch character within the tubes. They highlight the collapse of the skyrmion texture upon approaching the surfaces of the needle, provide evidence for the coexistence of longitudinal and transverse skyrmion textures, and reveal an axial modulation of the SkTs that is found to be strongly correlated among neighboring tubes in the needle. Based on the quantitative 3D magnetic induction data, we have calculated spatially resolved energy density maps across the SkTs that provide experimental evidence for the energetic stabilization of these magnetic solitons through an energy gain due to the Dzyaloshinskii-Moryia interaction, which overcompensates the exchange energy in the tube centers. Details of the novel experimental setup and limitations of the approach will be discussed.
[1] D. Wolf et al., arXiv:2101.12630 [cond-mat.mtrl-sci]