Resonant fluxon transmission through impurities

TL;DR

This paper investigates how fluxons transmit through multiple impurities in a long Josephson junction, analyzing the effects of impurity type, strength, and placement on the threshold pinning current.

Contribution

It provides a detailed analysis of fluxon transmission through various impurities, highlighting how impurity configuration affects the threshold pinning current.

Findings

Threshold pinning current shows a minimum with impurity spacing for similar impurities.

Maximum threshold pinning current occurs when a microresistor is followed by a microshort.

Impurity type and placement significantly influence fluxon transmission behavior.

Abstract

Fluxon transmission through several impurities of different strength and type (i.e., microshorts and microresistors), placed in a long Josephson junction is investigated. Threshold pinning current on the impurities is computed as a function of the distance between them, their amplitudes and the dissipation parameter. It is shown that in the case of consequently placed microshorts or microresistors, the threshold pinning current exhibits a clear minimum as a function of the distance between the impurities. In the case of a microresistor, followed by a microshort, an opposite phenomenon is observed, namely the threshold pinning current exhibits maximum as a function of the distance between the impurities.