The two-bands model of the magnetic tunnel junctions in the Fe/Cr/MgO/Fe structure

TL;DR

This paper presents a theoretical analysis of spin-dependent transport in Fe/Cr/MgO/Fe magnetic tunnel junctions using a two-bands model, non-equilibrium Green functions, and s-d hybridization effects.

Contribution

It introduces a two-bands electronic structure model with s-d hybridization for Fe electrodes in MTJs, providing detailed transport calculations.

Findings

Demonstrates the impact of s-d hybridization on tunneling conductance.

Provides a framework for analyzing non-collinear magnetization configurations.

Utilizes advanced Green function techniques for spin transport analysis.

Abstract

In this paper we present theoretical studies of spin dependent transport in Fe/Cr/MgO/Fe tunnel junctions with non-collinear alignment of magnetizations of metallic layers comprising these MTJs. Calculations are performed with use of non-equilibrium Green function technique in the framework of Keldysh formalism. WKB approximation is used for wave and Green functions in the trapezoidal barrier region under applied voltage. Electronic structure of ferromagnetic electrodes is modeled with two bands model, i.e. with majority s-electrons and minority d-holes. Furthermore, we introduce s-d hybridization by calculating the corresponding perturbation corrections for the wave and Green functions.