Propagation dynamics of spin excitations along skyrmion strings

Magnetic skyrmions, topological solitons characterized by a two-dimensional swirling spin texture, have recently attracted attention as stable particle-like objects. In a three-dimensional system, a skyrmion can extend in the third dimension forming a robust and flexible string structure, whose uniq...

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Bibliographic Details
Published in:Nature communications 2020-01, Vol.11 (1), p.256-256, Article 256
Main Authors: Seki, S., Garst, M., Waizner, J., Takagi, R., Khanh, N. D., Okamura, Y., Kondou, K., Kagawa, F., Otani, Y., Tokura, Y.
Format: Article
Language:English
Subjects:
639/766/119/1001
639/766/119/997
Dimensional stability
Electrons
Excitation
Group velocity
Humanities and Social Sciences
Hypothetical particles
Information transfer
Lattice vibration
multidisciplinary
Neutrons
Particle theory
Propagation
Reciprocity
Science
Science (multidisciplinary)
Solitary waves
Spin dynamics
Strings
Swirling
Topology
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Summary:Magnetic skyrmions, topological solitons characterized by a two-dimensional swirling spin texture, have recently attracted attention as stable particle-like objects. In a three-dimensional system, a skyrmion can extend in the third dimension forming a robust and flexible string structure, whose unique topology and symmetry are anticipated to host nontrivial functional responses. Here we experimentally demonstrate the coherent propagation of spin excitations along skyrmion strings for the chiral-lattice magnet Cu 2 OSeO 3 . We find that this propagation is directionally non-reciprocal and the degree of non-reciprocity, as well as group velocity and decay length, are strongly dependent on the character of the excitation modes. These spin excitations can propagate over a distance exceeding 50 μm, demonstrating the excellent long-range ordered nature of the skyrmion-string structure. Our combined experimental and theoretical analyses offer a comprehensive account of the propagation dynamics of skyrmion-string excitations and suggest the possibility of unidirectional information transfer along such topologically protected strings. The propagation dynamics of skyrmions in three dimensions have attracted increasing attention. Here, the authors demonstrate the coherent and non-reciprocal propagation of spin excitations along skyrmion strings for the chiral-lattice magnet Cu 2 OSeO 3 over a distance exceeding 50 μm.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-019-14095-0