Spin transport in proximity-induced ferromagnetic graphene

TLDR

Ferromagnetic insulators deposited on graphene can induce ferromagnetic correlations in graphene. We study the effect of the induced spin splittings on the graphene transport properties. The exchange splittings in proximity‑induced ferromagnetic graphene can be determined from transmission resonances in the linear‑response conductance or, independently, by magnetoresistance measurements in a spin‑valve device. We estimate that induced exchange splittings of about 5 meV can be achieved using EuO, and that the spin polarization near the Dirac point rises with barrier length, requiring long systems to experimentally determine Δ.

Abstract

Ferromagnetic insulators deposited on graphene can induce ferromagnetic correlations in graphene. We estimate that induced exchange splittings $\ensuremath{\Delta}\ensuremath{\sim}5\phantom{\rule{0.3em}{0ex}}\mathrm{meV}$ can be achieved by, e.g., using the magnetic insulator EuO. We study the effect of the induced spin splittings on the graphene transport properties. The exchange splittings in proximity-induced ferromagnetic graphene can be determined from the transmission resonances in the linear response conductance or, independently, by magnetoresistance measurements in a spin-valve device. The spin polarization of the current near the Dirac point increases with the length of the barrier, so that long systems are required to determine $\ensuremath{\Delta}$ experimentally.