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Propagation dynamics of spin excitations along skyrmion strings

Seki, S.; Garst, M. ORCID iD icon 1; Waizner, J.; Takagi, R.; Khanh, N. D.; Okamura, Y.; Kondou, K.; Kagawa, F.; Otani, Y.; Tokura, Y.
1 Institut für Theoretische Festkörperphysik (TFP), Karlsruher Institut für Technologie (KIT)


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.

Verlagsausgabe §
DOI: 10.5445/IR/1000119852
Veröffentlicht am 28.11.2021
DOI: 10.1038/s41467-019-14095-0
Zitationen: 81
Zitationen: 92
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Theoretische Festkörperphysik (TFP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2020
Sprache Englisch
Identifikator ISSN: 2041-1723
KITopen-ID: 1000119852
Erschienen in Nature Communications
Verlag Nature Research
Band 11
Heft 1
Seiten 256
Vorab online veröffentlicht am 14.01.2020
Nachgewiesen in Dimensions
Web of Science
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