Magnetotransport signatures of the proximity exchange and spin-orbit couplings in graphene

TL;DR

This paper investigates how proximity exchange and spin-orbit couplings in graphene on ferromagnetic substrates influence magnetotransport properties, providing detailed models and parameter maps for experimental observation.

Contribution

It offers a realistic transport model solving the Boltzmann equation to identify magnetotransport signatures of proximity effects in graphene.

Findings

Identification of anisotropic magnetoresistance due to proximity effects

Prediction of inverse spin-galvanic effect signatures

Guidelines for optimal experimental regimes

Abstract

Graphene on an insulating ferromagnetic substrate---ferromagnetic insulator or ferromagnetic metal with a tunnel barrier---is expected to exhibit giant proximity exchange and spin-orbit couplings. We use a realistic transport model of charge-disorder scattering and solve the linearized Boltzmann equation numerically exactly for the anisotropic Fermi contours of modified Dirac electrons to find magnetotransport signatures of these proximity effects: proximity anisotropic magnetoresistance, inverse spin-galvanic effect, and the planar Hall resistivity. We establish the corresponding anisotropies due to the exchange and spin-orbit couplings, with respect to the magnetization orientation. We also present parameter maps guiding towards optimal regimes for observing transport magnetoanisotropies in proximity graphene.