SKM 2021 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 5: Posters Magnetism II
MA 5.19: Poster
Dienstag, 28. September 2021, 10:00–13:00, P
Combing the helical phase of chiral magnets with electric currents — •Jan Masell1, Xiuzhen Yu1, Naoya Kanazawa2, Yoshinori Tokura1,2, and Naoto Nagaosa1,2 — 1RIKEN CEMS, Wako, Japan — 2University of Tokyo, Tokyo, Japan
In chiral magnets, the competition between the ferromagnetic exchange interaction and the small Dzyaloshinskii-Moriya interaction can form long-ranged helical modulations as the ground state. This helical phase has been extensively studied and chiral magnets gained extra attention when the skyrmion lattice was discovered in the chiral magnet MnSi a decade ago. However, in contrast to particle-like skyrmions, the helical phase seemed useless for spintronic applications as it is strongly pinned and hard to manipulate.
We have recently managed to unpin the helical phase in thin films of the chiral magnet FeGe by using electrical currents. Our theoretical analytical and numerical analysis predicts that the unpinned helical phase shows a variety of interesting dynamical phenomena, including distinct reorientation processes which can be driven by defects deep in the bulk or by the edge of the material, and predict numerous instabilities. Our results pave the way for "helitronics" and potential application in memory devices or unconventional computing.
[1] J. Masell, X.Z. Yu, N. Kanazawa, Y. Tokura & N. Nagaosa, Phys. Rev. B 102, 180402(R) (2020)