Induced exchange and spin-orbit effects by proximity in graphene on Ni and Co

Abstract

The induced-proximity effects of nearly commensurate lattice structure of a graphene layer on Ni(111) and Co(0001) substrates in the AC stacking configuration are addressed through an analytical tight-binding approach within the Slater-Koster method. A minimal Hamiltonian is constructed by considering the hybridizations of the magnetic $3d$-orbitals of Ni(Co) atoms with the $p_z$-orbitals of graphene, in addition to the atomic spin-orbit coupling and the magnetization of the Ni(Co) atoms. A low-energy effective Hamiltonian for graphene/Ni(Co) describing the perturbed $\pi$-bands in the vicinity of the Dirac points is derived which enable us to get further insight on the physical nature of the induced-effective couplings to the graphene layer. It is shown that a magneto-spin-orbit type effect may emerge through two competing mechanisms simultaneously present, namely the proximity induced exchange and Rashba spin-orbit interaction. Such effects results in giant exchange splittings and robust Rashba spin-orbit coupling transferred to the graphene layer in agreement with recent density functional theory calculations and experimental observations. We further analyze the physical conditions for the appearance of intact Dirac cones in the minority spin bands as observed by recent photoemission measurements with spin resolution.

13 pages, 7 figures

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• Doping graphene with metal contacts
• The electronic properties of bilayer graphene
• Intrinsic and Rashba Spin-orbit Interactions in Graphene Sheets
• Proximity-induced ferromagnetism in graphene revealed by anomalous Hall effect
• Magnetic Insulator-Induced Proximity Effects in Graphene: Spin Filtering and Exchange Splitting Gaps
• Proximity induced spin orbit effects in graphene on Au
• Gate-Tunable Exchange Coupling Between Cobalt Clusters on Graphene

Cited by in corpus (6)

• Resonant transport in Kekule-distorted graphene nanoribbons
• Emergent correlated phases in rhombohedral trilayer graphene induced by proximity spin-orbit and exchange coupling
• Swapping exchange and spin-orbit induced correlated phases in proximitized Bernal bilayer graphene
• Rashba spin splitting based on trilayer graphene systems
• Spin waves in doped graphene: a time-dependent spin-density-functional approach to collective excitations in paramagnetic two-dimensional Dirac fermion gases
• Layered Opposite Rashba Spin-Orbit Coupling in Bilayer Graphene: Loss of Spin Chirality, Symmetry Breaking and Topological Transition