Theoretical study of introducing spin into nonmagnetic graphene-based single-molecule junction by edge modifications
نویسندگان
چکیده
Injecting spins into nonmagnetic molecular devices has attracted much attention in spintronics. Herein, we propose a novel strategy to introduce magnetism single benzene molecule coupled with two armchair graphene nanoribbons (AGNR) electrodes, where the ends of AGNR electrodes are cut zigzag-edge triangular graphenes (ZTGs). The spin-dependent transport properties junction investigated by using density functional theory (DFT) combined non-equilibrium Green’s function (NEGF) method. analyses projected states and net spin distribution scattering region reveal that intrinsic ZTGs is weakened, owing transfer from molecule. More interestingly, attenuated can still contribute significant junction. Transport calculations show parallel configuration, large polarization nearly 90% current obtained. However, reversed antiparallel configuration. Positive or negative tunneling magnetoresistance (TMR) be modulated bias voltage. A TMR up 53% obtained device. results further analyzed transmission spectra local states. This work presents promising potential applications field spintronics, which design based spintronic devices.
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ژورنال
عنوان ژورنال: Chinese Physics
سال: 2023
ISSN: ['1000-3290']
DOI: https://doi.org/10.7498/aps.72.20230267