Publikation:

Spacetime magnetic hopfions from internal excitations and braiding of skyrmions

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Datum

2024

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Knapman, Ross
Tausendpfund, Timon
Everschor-Sitte, Karin

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Deutsche Forschungsgemeinschaft (DFG): 320163632
Deutsche Forschungsgemeinschaft (DFG): 505561633
Deutsche Forschungsgemeinschaft (DFG): 403233384

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Published

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Communications Physics. Springer. 2024, 7(1), 151. eISSN 2399-3650. Verfügbar unter: doi: 10.1038/s42005-024-01628-3

Zusammenfassung

Spatial topology endows topological solitons, such as skyrmions and hopfions, with fascinating dynamics. However, the temporal dimension has so far provided a passive stage on which topological solitons evolve. Here we construct spacetime magnetic hopfions: magnetic textures in two spatial dimensions that when excited by a time-periodic drive develop spacetime topology. We uncover two complementary construction routes using skyrmions by braiding their center of mass position and by controlling their internal low-energy excitations. Spacetime magnetic hopfions can be realized in nanopatterned grids to braid skyrmions and in frustrated magnets under an applied AC electric field. Their topological invariant, the spacetime Hopf index, can be tuned by the applied electric field as demonstrated by our collective coordinate modeling and micromagnetic simulations. The principles we have introduced to actively control spacetime topology are not limited to magnetic solitons, opening avenues to explore spacetime topology of general order parameters and fields.

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Fachgebiet (DDC)
530 Physik

Schlagwörter

Condensed-matter physics, Spintronics, Topological defects

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Datensatz
Supplementary Codes for Spacetime Magnetic Hopfions: From Internal Excitations and Braiding of Skyrmions
(Vv2, 2024) Knapman, Ross; Tausendpfund, Timon; Diaz, Sebastian A.; Everschor-Sitte, Karin

Zitieren

ISO 690KNAPMAN, Ross, Timon TAUSENDPFUND, Sebastian A. DIAZ, Karin EVERSCHOR-SITTE, 2024. Spacetime magnetic hopfions from internal excitations and braiding of skyrmions. In: Communications Physics. Springer. 2024, 7(1), 151. eISSN 2399-3650. Verfügbar unter: doi: 10.1038/s42005-024-01628-3
BibTex
@article{Knapman2024-05-09Space-69987,
  title={Spacetime magnetic hopfions from internal excitations and braiding of skyrmions},
  year={2024},
  doi={10.1038/s42005-024-01628-3},
  number={1},
  volume={7},
  journal={Communications Physics},
  author={Knapman, Ross and Tausendpfund, Timon and Diaz, Sebastian A. and Everschor-Sitte, Karin},
  note={Article Number: 151}
}
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Beschreibung der Forschungsdaten
Micromagnetic simulation and time-integrated collective coordinate data; code used to integrate the collective coordinate equations of motion, the modified MuMax source code and compiled binary along with the simulation scripts, as well as the data analysis and visualization code used to create the figures and Supplementary Movies
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