▎ 摘　　要

We investigate the magnetic transport properties for a molecular device model constructed by a carbon atomic chain embedding in two hydrogen-passivated graphene nanoribbons (GNRs) electrodes with sawtooth zigzag edges. The spin-dependent transport simulation is carried out by the first-principles approach based on the density functional theory combing with nonequilibrium Green's function formalism. It is found that the dual spin-filtering effect with the perfect efficiency up to 100%, high-performance dual-spin diode effect with the rectification ratio reaches about 2.02 x 10(8) and obvious negative differential resistance behaviour with a peak-to-valley ratio near 3.24 x 10(6) are numerically observed in such proposed molecular device. Particularly, a giant magnetoresistance ratio approaching 2.38 x 10(7)% is also observed, which is two orders magnitude higher than the value of a zigzag-edge GNR. These findings suggest that our proposed device has multifunction with highly effective spin-filter, spin-diode, spin-valve performance. [GRAPHICS]