Perpendicular transport and magnetization processes in magnetic multilayers with strongly and weakly coupled magnetic layers

TL;DR

This paper models magnetic multilayers to analyze giant magnetoresistance, exchange coupling, and thermoelectric power, revealing how magnetic structure phases influence GMR and TEP oscillations.

Contribution

It provides a theoretical analysis of GMR, exchange coupling, and TEP in multilayers with varying magnetic layer coupling strengths using a two-band tight-binding model.

Findings

GMR relates to magnetic phase diagrams and can be negative at specific layer thicknesses.

TEP exhibits pronounced oscillations around negative bias.

Hysteresis loops are computed for magnetic configurations.

Abstract

Within the framework of a two-band tight-binding model, we have performed calculations of giant magnetoresistance, exchange coupling and thermoelectric power (TEP) for a system consisting of three magnetic layers separated by two non-magnetic spacers with the first two magnetic layers strongly antiferromagnetically exchange-coupled. We have shown how does the GMR relate with the corresponding regions of magnetic structure phase diagrams and computed some relevant hysteresis loops, too. The GMR may take negative values for specific layers thicknesses, and the TEP reveals quite pronounced oscillations around a negative bias.