Tuneable terahertz oscillation arising from Bloch-point dynamics in chiral magnets

Yu Li, Leonardo Pierobon, Michalis Charilaou, Hans-Benjamin Braun, Niels R. Walet, Jörg F. Löffler, James J. Miles, Christoforos Moutafis

Research output: Contribution to journalArticlepeer-review


Skyrmionic textures are being extensively investigated due to the occurrence of novel topological magnetic phenomena, and their promising applications in a new generation of spintronic devices take advantage of the robust topological stability of their spin structures. The development of practical devices relies on a detailed understanding of how skyrmionic structures can be formed, transferred, detected, and annihilated. In this work our considerations go beyond static skyrmions and theoretically show that the formation/annihilation of both skyrmions and antiskyrmions is enabled by the transient creation and propagation of topological singularities (magnetic monopolelike Bloch points). Critically, our results predict that during the winding/unwinding of skyrmionic textures, the Bloch-point propagation will give rise to an emergent electric field with a substantial amplitude and in the terahertz frequency range. We also demonstrate ways for controlling Bloch-point dynamics, which directly enable the tunablility on generation of this signal, as well as its frequency and amplitude. Our studies provide a concept of directly exploiting topological singularities for terahertz skyrmion-based electronic devices.
Original languageEnglish
Article number033006
Pages (from-to)1-15
Number of pages15
JournalPhysical Review Research
Issue number3
Publication statusPublished - 1 Jul 2020


  • Dzyaloshinskii-Moriya interaction
  • ferromagnetism
  • magnetism
  • micromagnetism
  • skyrmions
  • topological materials
  • ultrafast magnetization dynamics


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