Density of States in the Heterostructure Ferromagnetic Insulator-Superconductor-Ferromagnetic Insulator

Abstract

We consider a spin valve composed of a superconducting film (S) between two ferromagnetic insulators (FI) on two sides. In the dirty limit, the superconductor is described by Usadel equations. Appropriate boundary conditions were chosen for two S-FI interfaces, which are described via the interface parameter spin mixing angle. By numerically solving the Usadel equations, the density of states (DOS) at different spin mixing angles was obtained. It was shown previously that the critical temperature of such an FI-S-FI structure depends on the mutual alignment of the FI layers’ magnetization. We follow the evolution of DOS at the change of misalignment of ferromagnets magnetization and probe the zero bias peak creation. The DOS characteristic features may give fruitful information about triplet superconducting components creation and interplay inside the S layer.