Reentrant temperature dependence of critical current in superconductor - ferromagnet - superconductor junctions based on PdFe alloys

TL;DR

This paper investigates the temperature-dependent behavior of superconductor-ferromagnet-superconductor junctions with PdFe alloys, revealing a reentrant critical current linked to a transition into the $\

Contribution

It demonstrates the reentrant temperature dependence of the critical current in S-F-S junctions based on PdFe alloys, indicating a transition to the $\

Findings

Reentrant critical current observed at specific temperatures.

Transition into the $\

empirical

Abstract

The magnetic and transport properties of $Pd_{0.99}Fe_{0.01}$ thin films have been studied. We have found that the Curie temperature of the films is about 20 K and the magnetic properties strongly depend on temperature below $T_{Curie}$. We have also fabricated the set of superconductor-ferromagnet-superconductor josephson junctions $Nb-PdFe-Nb$. The temperature dependence of the junctions with the ferromagnet layer thickness of about 36 nm shows the reentrant behaviour that is the evidence of the transition of the junction into the $\pi$-state.