Berlin 2018 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 9: Skyrmions II (joint session MA/TT/KFM)
KFM 9.7: Vortrag
Dienstag, 13. März 2018, 11:00–11:15, EB 301
Induction mapping of the 3D Spin Texture of Skyrmions in Thin Helimagnets — •Sebastian Schneider1,2, Daniel Wolf1, Matthew J. Stolt3, Song Jin3, Darius Pohl1, Bernd Rellinghaus1, Marcus Schmidt4, Bernd Büchner1, Sebastian T. B. Goennenwein2, Kornelius Nielsch1,2, and Axel Lubk1 — 1IFW Dresden, Dresden, Germany — 2TU Dresden, Dresden, Germany — 3University of Wisconsin-Madison, Madison, USA — 4MPI CPfS, Dresden, Germany
Envisaged applications of skyrmions in magnetic memory and logic devices crucially depend on the stability and mobility of these topologically non-trivial magnetic textures in thin films. We present for the first time experimental evidence for a characteristic 3D modulation of the skyrmionic spin texture towards the sample surface. Inherent to this structure is the gradual change of the Bloch nature of the skyrmion in the depth of the film to surface chiral twists. By combining focal series inline electron holography (EH), and off-axis EH to quantitatively reconstruct the projected magnetic field pertaining to both the helical and the skyrmion lattice phase in single crystal nanoplates of the isotropic chiral magnet Fe0.95Co0.05Ge nanoplate with electron tomography and magnetostatic simulations of the fields, we extract quantitative information on the 3D spin texture of skyrmions. Our results highlight the relevance of surfaces for the formation of skyrmions in thin film geometries and pave the way towards a surface-induced tailoring of the skyrmion structure.