Magnetic transport properties of a trigonal graphene sandwiched between graphene nanoribbon electrodes

Magnetic transport behaviors of a zigzag-edge trigonal graphene (ZTG) constructed as a nanodevice with zigzag graphene nanoribbon (ZGNR) electrodes are investigated, and various magnetic configurations are considered. It is found that excellent magnetic device natures, such as the perfect (100%) spin polarization in a large bias region, spin-resolved rectification ratios approaching 105, and the giant magnetoresistance effect up to 1015%, can be achieved, which is indeed an extremely high value as compared with previously reported theoretical one, ∼107%, for complete ZGNR-based magnetic devices and experimental ones, ∼104%, for the MgO tunnel junction. This can be attributed to unique transmission features due to the strong modulating ability of ZTG for the magnetic transport. These results suggest that the ZTG might possess some advantages in nature for developing magnetic devices.