Multifunctional near-infrared polarized photodetector driven by the anisotropic photogalvanic effect in a two-dimensional MnSSe/TaIrS4/MnSSe magnetic tunnel junction

Traditional polarized photodetectors have faced critical challenges, such as limited functionality, integration complexities, and subpar photosensitivity. In this study, we propose a kind of multifunctional coupled polarized photodetector based on an anisotropic $\mathrm{MnSSe}/{\mathrm{Ta}\mathrm{Ir}\mathrm{S}}_{4}/\mathrm{MnSSe}$ lateral magnetic tunnel junction (MTJ) that integrates self-powered, near-infrared photodetection, spin valve, pure spin current, and multichannel optical communication induced by the photogalvanic effect. Profiting from the synergistic interplay between optical transition and spin-tunneling selection rules within the MTJ, seamless toggling between perfect spin filtering and pure spin current can be achieved in the self-powered mode. Furthermore, the remarkable performance metrics, including an anisotropy ratio of 481.84, an extinction ratio of 725.43, and a tunneling magnetoresistance ratio of 100%, underscore the exceptional capabilities of the multifunctional polarized photodetector. Building upon these achievements, a proof-of-concept three-channel optical communication scheme is shown to amplify the output efficiency of binary signals by an additional 50%. Our research provides insights into the development of multifunctional and high-performance photodetectors and presents an interesting platform for advancing coupled optoelectronic and spintronic applications.