Nonlinear dynamics of Josephson vortices in a film screen under dc and ac magnetic fields
Abstract
We present detailed numerical simulations of Josephson vortices in a long Josephson junction perpendicular to a thin film screen under strong dc and ac magnetic fields. By solving the sine-Gordon equation, we calculated the threshold magnetic field for penetration of fluxons as a function of frequency, and the power dissipated by oscillating fluxons as functions of the ac field amplitude and frequency. We considered the effects of superimposed ac and dc fields, and a bi-harmonic magnetic field resulting in a vortex ratchet dynamics. The results were used to evaluate the contribution of weak-linked grain boundaries to the nonlinear surface resistance of polycrystalline superconductors under strong electromagnetic fields, particularly thin film screens and resonator cavities.
Keywords
Cite
@article{arxiv.1410.4606,
title = {Nonlinear dynamics of Josephson vortices in a film screen under dc and ac magnetic fields},
author = {Ahmad Sheikhzada and Alexander Gurevich},
journal= {arXiv preprint arXiv:1410.4606},
year = {2014}
}
Comments
This paper has 23 figures and 11 pages in its pdf format. The paper has been published online and will be published in text soon in November in journal of Physica C