Density of states anomalies in hybrid superconductor-ferromagnet-normal metal structures

TL;DR

This paper investigates the spatially-resolved density of states in superconductor-ferromagnet-normal metal bilayers, revealing unique features and dependencies on exchange energy through analytical and numerical methods.

Contribution

It provides analytical solutions for DoS in thin-layer S(F/N) structures and explores how exchange energy affects the density of states.

Findings

Identification of peculiar DoS features in S(F/N) structures

Dependence of minigap and peak positions on exchange energy

Analytical solutions in the thin-layer limit

Abstract

The results of calculations of the spatially-resolved density of states (DoS) in an S(F/N) bilayer are presented (S is a superconductor, F is a metallic ferromagnet, N is a normal metal) within quasiclassical theory in the dirty limit. Analytical solutions are obtained in the case of thin F, N layers which demonstrate the peculiar features of DoS in this system. The dependencies of the minigap and the DoS peak positions on the exchange energy and parameters of the layers are studied numerically