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.
@article{arxiv.0905.4701,
title = {Electrical Detection of Spin Precession in Single Layer Graphene Spin Valves with Transparent Contacts},
author = {Wei Han and K. Pi and W. Bao and K. M. McCreary and Yan Li and W. H. Wang and C. N. Lau and R. K. Kawakami},
journal= {arXiv preprint arXiv:0905.4701},
year = {2010}
}
Comments
to appear in Applied Physics Letters. v2 corrects the fit values for P