Current perpendicular to plane Giant Magnetoresistance (GMR) in laminated nanostructures

TL;DR

This paper presents a theoretical analysis of CPP GMR in laminated magnetic multilayers, highlighting how interface spin-flip scattering diminishes GMR and explaining experimental resistance observations.

Contribution

It introduces a comprehensive theoretical model incorporating interface scattering and spin-flip processes to explain GMR behavior in laminated structures.

Findings

Spin-flip scattering at interfaces reduces GMR significantly.

Lamination increases CPP resistance but only slightly enhances GMR ratio.

Theoretical results align with experimental observations.

Abstract

We theoretically studied spin dependent electron transport perpendicular-to-plain (CPP) in magnetic laminated multilayered structures by using Kubo formalism. We took into account not only bulk scattering, but the interface resistance due to both specular and diffuse reflection and also spin conserving and spin-flip processes. It was shown that spin-flip scattering at interfaces substantially reduces the value of GMR. This can explain the experimental observations that the CPP GMR ratio for laminated structures only slightly increases as compared to non-laminated ones despite lamination induces a significant increase in CPP resistance.