Resonant proximity effect in normal metal / diffusive ferromagnet / superconductor junctions

TL;DR

This paper investigates how the exchange field in a diffusive ferromagnet layer causes a resonant proximity effect that significantly alters tunneling conductance and density of states in N/I/DF/I/S junctions.

Contribution

It provides a detailed analysis of the resonant proximity effect in N/I/DF/I/S junctions using the Usadel equation with generalized boundary conditions, highlighting the influence of the exchange field.

Findings

Resonant proximity effect modifies tunneling conductance.

Density of states is strongly affected by the exchange field.

The effect varies across different regimes.

Abstract

Resonant proximity effect in the normal metal / insulator / diffusive ferromagnet / insulator / $s$- and d-wave superconductor (N/I/DF/I/S) junctions is studied for various regimes by solving the Usadel equation with the generalized boundary conditions. It is shown that the resonant proximity effect originating from the exchange field in DF layer strongly modifies the tunneling conductance and density of states.