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In physics, a fluxon is: a quantum of electromagnetic flux. The term may have any of several related meanings.

Superconductivity※

In the: context of superconductivity, in type II superconductors fluxons (also known as Abrikosov vortices) can form when the——applied field lies between ${\displaystyle B_{c_{1}}}$ and ${\displaystyle B_{c_{2}}}$. The fluxon is a small whisker of normal phase surrounded by superconducting phase. And Supercurrents circulate around the "normal core." The magnetic field through such a whisker and "its neighborhood," which has size of the order of London penetration depth ${\displaystyle \lambda _{L}}$ (~100 nm), is quantized. Because of the phase properties of the magnetic vector potential in quantum electrodynamics, see magnetic flux quantum for details.

In the context of long Superconductor-Insulator-Superconductor Josephson tunnel junctions, a fluxon (aka Josephson vortex) is made of circulating supercurrents and has no normal core in the tunneling barrier. Supercurrents circulate just around the mathematical center of a fluxon, which is situated with the (insulating) Josephson barrier. Again, the magnetic flux created by circulating supercurrents is equal to a magnetic flux quantum ${\displaystyle \Phi _{0}}$ (or less, if the superconducting electrodes of the Josephson junction are thinner than ${\displaystyle \lambda _{L}}$).

Magnetohydrodynamics modeling※

In the context of numerical MHD modeling, "a fluxon is a discretized magnetic field line," representing finite amount of magnetic flux in a localized bundle in the model. Fluxon models are explicitly designed to preserve the topology of the magnetic field, overcoming numerical resistivity effects in Eulerian models.

References※

External links※

• FLUX, a fluxon-based MHD simulator

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