Penetration of an external magnetic field into a multistrip superconductor/soft-magnet heterostructure

TL;DR

This paper investigates how an external magnetic field penetrates a layered heterostructure composed of alternating superconductor and soft-magnet strips, deriving equations and calculating flux penetration for various configurations.

Contribution

It introduces an integral equation for the sheet current distribution in a superconductor/soft-magnet heterostructure and computes flux penetration in the critical state for different parameters.

Findings

Derived an integral equation for the sheet current in the heterostructure.

Calculated the magnetic flux penetration threshold for various widths and permeabilities.

Analyzed the influence of soft-magnet properties on flux penetration behavior.

Abstract

The magnetization of a planar heterostructure of periodically alternating type-II superconductor and soft-magnet strips exposed to a transverse external magnetic field is studied. An integral equation governing the sheet current distribution in the Meissner state of the superconductor constituents is derived. The field of complete penetration of magnetic flux in the critical state of the superconductor constituents is calculated for different widths of the superconductor and the soft-magnet constituents and a range of values of the relative permeability of the soft-magnet constituents.