Comparative Studies on Giant Magnetoresistance in Carbon Nanotubes and Graphene Nanoribbons with Ferromagnetic Contacts

TL;DR

This study compares giant magnetoresistance in carbon nanotubes and graphene nanoribbons, revealing similar GMR effects influenced by chirality, suggesting both materials' potential in spintronics.

Contribution

It provides a comparative analysis of GMR in CNTs and graphene nanoribbons using Green's functions and tight-binding models, highlighting the influence of chirality.

Findings

GMR in graphene is comparable to CNTs.

GMR depends strongly on chirality.

Graphene may be promising for spintronic applications.

Abstract

This contribution reports on comparative studies on giant magnetoresistance (GMR) in carbon nanotubes (CNTs) and graphene nanoribbons of similar aspect ratios (i.e perimeter/length and width/length ratios, for the former and the latter, respectively). The problem is solved at zero temperature in the ballistic transport regime, by means of the Green's functions technique within the tight-binding model and with the so-called wide band approximation for electrodes. The GMR effect in graphene is comparable to that of CNTs, it depends strongly on the chirality and only slightly on the aspect ratio. It turns out that graphene, analogously to CNTs may be quite an interesting material for spintronic applications.