Critical current density and trapped field in HTS with asymmetric magnetization loops

TL;DR

This paper analyzes the extended critical state model to understand how asymmetric magnetization loops affect critical current density and trapped magnetic fields in high-temperature superconductors, considering grain size effects.

Contribution

It introduces analysis of asymmetry in hysteresis curves and its relation to current circulation scale within the extended critical state model.

Findings

Critical current density depends on grain size.

Asymmetry in hysteresis curves relates to current circulation scale.

Trapped magnetic field varies with grain size and magnetization asymmetry.

Abstract

Applications of the extended critical state model are considered. The trapped magnetic field, the penetration field and the field dependence of the critical current density are analysed. The critical current density and the trapped field in superconducting grains depend on the grain size. Asymmetry of the hysteresis curves relative to the M = 0 axis is related to the scale of the current circulation.