Theoretical studies of spin-dependent electronic transport in ferromagnetically contacted graphene flakes

TL;DR

This study uses a tight-binding model and Green's function technique to analyze spin-dependent transport in ferromagnetically contacted graphene flakes, revealing significant GMR effects and the influence of edge chirality and contact geometry.

Contribution

It provides a theoretical analysis of spin-dependent transport in graphene flakes with ferromagnetic contacts, highlighting the impact of edge chirality and contact geometry on GMR and conductance.

Findings

GMR coefficient can be significant in graphene flakes with ferromagnetic contacts.

Armchair-edge graphene flakes exhibit higher GMR than zigzag-edge flakes.

Contact geometry affects conductivity and shot noise, especially in large aspect ratio flakes.

Abstract

Based on a tight-binding model and a recursive Green's function technique, spin-depentent ballistic transport through tinny graphene sheets (flakes) is studied. The main interest is focussed on: electrical conductivity, giant magnetoresistance (GMR) and shot noise. It is shown that when graphene flakes are sandwiched between two ferromagnetic electrodes, the resulting GMR coefficient may be quite significant. This statement holds true both for zigzag and armchair chiralities, as well as for different aspect (width/length) ratios. Remarkably, in absolute values the GMR of the armchair-edge graphene flakes is systematically greater than that corresponding to the zigzag-edge graphene flakes. This finding is attributed to the different degree of conduction channel mixing for the two chiralities in question. It is also shown that for big aspect ratio flakes, 3-dimensional end-contacted leads, very much like invasive contacts, result in non-universal behavior of both conductivity and Fano factor.