Spin-dependent transport and spin transfer torque in a system based on silagraghene nanoribbons

We theoretically investigate the spin-dependent transport and spin transfer torque (STT) in a system composed of a silagraphene nanoribbon (SLNR) connected to two ferromagnetic (FM) leads with arbitrary relative magnetization direction, using the tight-binding model in the nearest neighbor approximation within the framework of the Green function's technique and Landauer-Butticer formalism. We report numerical calculation results for conductance (G), magnetoresistance (MR), and spin transfer torque (STT) in the FM/SLNR/FM junction for different strengths of ferromagnetic magnetization. It is found that the G and MR show oscillatory behavior around EF = 0 and more interestingly, the magnitude of the MR reaches up to %100, which can be effectively used for sensitive switchings. In addition, it is demonstrated that STT versus Fermi energy shows noticeable peaks with moving away from Dirac point energy. The results show that the torques as a function of the angle between two magnetic electrodes (0) show a sin-like behavior and the G -0 curve demonstrates approximately a cosine-like behavior, which is a function of M. Our results can provide valuable theoretical guidance to design future novel spintronic devices.