Electrodynamics in Skyrmions Merging

In a recent study the coalescence of magnetic skyrmions was observed in a metallic chiral magnet Fe0.5Co0.5Si when the skyrmion phase is destroyed, and numerical simulations demonstrated the existence of a monopole at the merging point of two skyrmion lines. The exchange interaction between such mag...

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Bibliographic Details
Published in:arXiv.org 2014-04
Main Authors: Takashima, Rina, Fujimoto, Satoshi
Format: Article
Language:English
Subjects:
Coalescing
Computer simulation
Conduction electrons
Couplings
Electrodynamics
Electromagnetic fields
Electromagnetism
Electrons
Exchanging
Hypothetical particles
Monopoles
Particle theory
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Summary:In a recent study the coalescence of magnetic skyrmions was observed in a metallic chiral magnet Fe0.5Co0.5Si when the skyrmion phase is destroyed, and numerical simulations demonstrated the existence of a monopole at the merging point of two skyrmion lines. The exchange interaction between such magnetic textures and the conduction electrons can be described by emergent electromagnetism. In this paper, we investigate the effect of a skyrmions-merging process on conduction electrons by calculating induced electric currents. Here, in addition to the exchange interactions, we consider the antisymmetric spin-orbit couplings (SOC) due to broken inversion symmetry, which is an essential ingredient for the realization of skyrmion texture in the itinerant magnet Fe0.5Co0.5Si. We obtain an adiabatic current which is dissipationless, and dissipative currents driven by the effective electromagnetic fields including the effect of SOC. In terms of the effective fields, a moving monopole at the merging point turns out to be a dyon-like object; i.e. it has both electric charge and magnetic charge.
ISSN:2331-8422
DOI:10.48550/arxiv.1401.7140