Topology dependence of skyrmion Seebeck and skyrmion Nernst effect

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Scientific Reports. Springer Nature. 2022, 12(1), 6801. eISSN 2045-2322. Available under: doi: 10.1038/s41598-022-10550-z
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We explore the dynamics of skyrmions with various topological charges induced by a temperature gradient in an ultra-thin insulating magnetic film. Combining atomistic spin simulations and analytical calculations we find a topology-dependent skyrmion Seebeck effect: while skyrmions and antiskyrmions move to the hot regime, a topologically trivial localized spin structure moves to the cold regime. We further reveal the emergence of a skyrmion Nernst effect, i.e. finite, topology-dependent velocities transverse to the direction of the temperature gradient. These findings are in agreement with accompanying simulations of skyrmionic motion induced by monochromatic magnon currents, allowing us to demonstrate that the magnonic spin Seebeck effect is responsible for both, skyrmion Seebeck and Nernst effect. Furthermore we employ scattering theory together with Thiele's equation to identify linear momentum transfer from the magnons to the skyrmion as the dominant contribution and to demonstrate that the direction of motion depends on the topological magnon Hall effect and the topological charge of the skyrmion.

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ISO 690WEISSENHOFER, Markus, Ulrich NOWAK, 2022. Topology dependence of skyrmion Seebeck and skyrmion Nernst effect. In: Scientific Reports. Springer Nature. 2022, 12(1), 6801. eISSN 2045-2322. Available under: doi: 10.1038/s41598-022-10550-z
BibTex
@article{Weienhofer2022-04-26Topol-57425,
  year={2022},
  doi={10.1038/s41598-022-10550-z},
  title={Topology dependence of skyrmion Seebeck and skyrmion Nernst effect},
  number={1},
  volume={12},
  journal={Scientific Reports},
  author={Weißenhofer, Markus and Nowak, Ulrich},
  note={This work was financially supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) through Project No. 403502522 and the SFB 1432. Article Number: 6801}
}
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This work was financially supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) through Project No. 403502522 and the SFB 1432.
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