▎ 摘　　要

Binding, magnetic, and electron transport properties of 3d transition-metal (TM) adatoms (Cr-Cu) on an antiferromagnetic armchair graphene nanoribbon heterojunction are studied by means of densityjunction emulates a system of two symmetric potential barriers and one well with resonances (quasibound states). Binding energies show a strong interaction between 3d TM adatoms and heterojunction hollow sites, where 3d TM adatoms prefer the edges rather than the middle of the graphene heterojunction. As for magnetic properties, heterojunctions with Cr, Mn, and Fe have a ferromagnetic behavior with a total magnetic moment >= 4/LB, while Co, Ni, and Cu adatoms induce antiferromagnetism in the full system with total magnetizations < 3/LB. Transmission curves show that electronic resonances undergo a spinsplitting effect induced by 3d TM adatoms, and current versus bias-voltage curves show spin currents from which spin-polarized ratios (SPRs) > 75% for Co and approximately 100% for Ni adatoms are calculated. Finally, an oscillatory behavior is observed in SPR curves at low bias due to a combined effect of resonant tunneling and spin filtering. Therefore, these results suggest that the present antiferromagnetic graphene heterojunction with Co and Ni adatoms is suitable for future spin and low-power nanoelectronics as a spin-dependent resonant tunneling device.