Electrical Detection of Spin Precession in Single Layer Graphene Spin Valves with Transparent Contacts

TL;DR

This study demonstrates electrical detection of spin precession in single-layer graphene using non-local spin valve measurements at room temperature, revealing key spin transport parameters and confirming the origin of the signals.

Contribution

It provides the first detailed measurement of spin precession and relaxation in graphene with transparent contacts, highlighting the spin diffusion length and efficiency.

Findings

Spin diffusion length of ~1.6 microns from magnetoresistance dependence.

Spin relaxation time of ~84 ps from Hanle precession fitting.

Confirmation that non-local signals originate from spin injection and transport.

Abstract

Spin accumulation and spin precession in single-layer graphene are studied by non-local spin valve measurements at room temperature. The dependence of the non-local magnetoresistance on electrode spacing is investigated and the results indicate a spin diffusion length of ~1.6 microns and a spin injection/detection efficiency of 0.013. Electrical detection of the spin precession confirms that the non-local signal originates from spin injection and transport. Fitting of the Hanle spin precession data yields a spin relaxation time of ~84 ps and a spin diffusion length of ~1.5 microns, which is consistent with the value obtained through the spacing dependence.