Spin Transport and Precession in Graphene measured by Nonlocal and Three-Terminal Methods

TL;DR

This study compares nonlocal and three-terminal measurement techniques for spin transport in graphene, confirming their consistency and reliability in extracting spin parameters across various temperatures.

Contribution

It demonstrates that both measurement methods yield identical spin parameters in graphene, validating their use in spintronics research without interface-related artifacts.

Findings

Identical spin lifetimes observed in both methods

Spin signals explained by standard spin transport models

No additional scattering mechanisms detected at interfaces

Abstract

We investigate the spin transport and precession in graphene by using the Hanle effect in nonlocal and threeterminal measurement geometries. Identical spin lifetimes, spin diffusion lengths and spin polarizations are observed in graphene devices for both techniques over a wide range of temperatures. The magnitude of the spin signals is well explained by spin transport models. These observations rules out any signal enhancements or additional scattering mechanisms at the interfaces for both geometries. This validates the applicability of both the measurement methods for graphene based spintronics devices and their reliable extractions of spin parameters.