Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 43: Magnetic textures I
MA 43.5: Vortrag
Donnerstag, 15. März 2018, 10:30–10:45, EB 407
Direct observation of chiral magnetic bobbers — F. Zheng1,2, F. N. Rybakov3, A. B. Borisov4, D. Song5, S. Wang6,7, Z-A. Li8, H. Du6,7, •N. S. Kiselev2, J. Caron1,2, A. Kovács1,2, M. Tian6,7, Y. Zhang6,7, S. Blügel2, and R. E. Dunin-Borkowski1,2 — 1Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich, Germany — 2Peter Grünberg Institut, Forschungszentrum Jülich, Germany — 3Department of Physics, KTH-Royal Institute of Technology, Stockholm, Sweden — 4M.N. Miheev Institute of Metal Physics, Ekaterinburg, Russia — 5National Center for Electron Microscopy in Beijing, Tsinghua University, China — 6High Magnetic Field Laboratory, Hefei, China — 7Collaborative Innovation Center of Advanced Microstructures, Nanjing University, China — 8Institute of Physics, Beijing, China
We report the direct observation of a new theoretically predicted hybrid particle-like magnetic state - a chiral bobber (ChB)1 - which can be thought of as skyrmion tube, which is coupled to the surface and whose end takes the form of a Bloch point. We use quantitative off-axis electron holography to identify ChBs in a thin plate of B20-type FeGe and to find the range of their stability in a temperature-field phase diagram. We reveal two distinct mechanisms of ChB nucleation and confirm the coexistence of ChBs with ordinary magnetic skyrmions over a wide range of field, temperature and film thickness2. Our work provides a perspective for the practical application of ChBs in data storage technology. [1] F. N. Rybakov et al. Phys. Rev. Let. 115, 117201 (2015). [2] F. Zheng et al. arXiv:1706.04654.