Magnetic flux trapping in porous superconductors

TL;DR

This paper explores how porosity affects magnetic flux trapping in superconductors, revealing that increased porosity generally reduces magnetic parameters but can enhance flux trapping in specific cases like mesoscopic samples.

Contribution

It provides new insights into the role of porosity in flux trapping, highlighting conditions where increased porosity improves magnetic flux retention.

Findings

Porosity decreases irreversibility and penetration fields generally.

Increased porosity can enhance flux trapping in mesoscopic samples.

Porosity's effect varies with sample size and critical current density.

Abstract

The magnetization of superconducting samples is influenced by their porosity. In addition to structural modifications and improved cooling, the presence of pores also plays a role in trapping magnetic flux. Pores have an impact on the irreversibility field, the full penetration field, and the remnant magnetization. Generally, as porosity increases, these parameters tend to decrease. However, in the case of mesoscopic samples or samples with low critical current densities, increased porosity can actually enhance the trapping of magnetic flux.