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Topological excitations in a kagome magnet

Author

Listed:
  • Manuel Pereiro

    (Uppsala University)

  • Dmitry Yudin

    (Uppsala University)

  • Jonathan Chico

    (Uppsala University)

  • Corina Etz

    (Uppsala University)

  • Olle Eriksson

    (Uppsala University)

  • Anders Bergman

    (Uppsala University)

Abstract

Chirality—that is, left or right handedness—is present in many scientific areas, and particularly in condensed matter physics. Inversion symmetry breaking relates chirality with skyrmions, which are protected field configurations with particle-like and topological properties. Here we show that a kagome magnet, with Heisenberg and Dzyaloshinskii–Moriya interactions, causes non-trivial topological and chiral magnetic properties. We also find that under special circumstances, skyrmions emerge as excitations, having stability even at room temperature. Chiral magnonic edge states of a kagome magnet offer, in addition, a promising way to create, control and manipulate skyrmions. This has potential for applications in spintronics, that is, for information storage or as logic devices. Collisions between these particle-like excitations are found to be elastic at very low temperature in the skyrmion-skyrmion channel, albeit without mass-conservation. Skyrmion–antiskyrmion collisions are found to be more complex, where annihilation and creation of these objects have a distinct non-local nature.

Suggested Citation

  • Manuel Pereiro & Dmitry Yudin & Jonathan Chico & Corina Etz & Olle Eriksson & Anders Bergman, 2014. "Topological excitations in a kagome magnet," Nature Communications, Nature, vol. 5(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5815
    DOI: 10.1038/ncomms5815
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