Abstract
The spin–valley transport and tunneling magnetoresistance (TMR) are studied in an off-resonant circularly polarized light (CPL)-modulated asymmetrical double-ferromagnetic (FM) WSe 2 junction. Based on the results, we propose a device that can simultaneously operate as spin–valley filter and exhibit giant magnetoresistance in a single system. For the antiparallel configuration, the broken spin degeneracy and optical Stark effect in the first FM barrier produce 100% spin (valley)-polarized particles. Subsequently, the spin valve effect from the second FM barrier gives rise to a 100% spin (valley)-selective polarization in the strengthened polarized energy windows of the first CPL. Furthermore, increasing the asymmetrical magnetization of such a junction is found to substantially enhance the TMR, leading to a positive 100% TMR. The TMR can be tuned from −100% to 100% and is sensitively dependent on the chirality of the second CPL due to the coupling between the spin valve effect and the optical Stark effect. Our findings indicate that double-FM barriers combined with off-resonant CPL modulation can be an excellent option to improve the spin–valley polarization and magnetoresistance of transition metal dichalcogenide-based structures. • A model was proposed to improve the magnetoresistance response as well as obtain two well-defined spin–valley polarization states. • The structure gives rise to a 100% spin (valley)-selective polarization in strengthened polarized energy windows of light. • Increasing the asymmetrical magnetization of this junction is found to substantially enhance the tunnel magnetoresistance to 100%. • The magnetoresistance can be tuned from −100% to 100% and is sensitively dependent on the chirality of light.
Published Version
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