Tunable terahertz oscillation arising from Bloch-point dynamics in chiral magnets
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Date
2020-07
Publication Type
Journal Article
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Abstract
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.
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published
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Volume
2 (3)
Pages / Article No.
33006
Publisher
American Physical Society
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Organisational unit
03661 - Löffler, Jörg F. / Löffler, Jörg F.
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172934 - Advanced nanoscale characterization of magnetic defects in metals (SNF)