Photo-modulated magnetoresistance in aferromagnetic/normal/ferromagnetic tunneljunction based on monolayer black phosphorene

Abstract We use the Floquet theory and the Landauer-Büttiker formula to
investigate the transport characteristics of a ferromagnetic/normal/ferromagnetic
tunnel junction based on monolayer black phosphorene under an off-resonant circularly
polarized light (CPL). The results show that the CPL can control the transmission
spectrum. In fact, the transmission gap of the antiparallel magnetized configuration is
significantly broadened, and the electron blocking effect is enhanced. The transmission
of the parallel magnetized configuration shows significant anisotropy and strong wave
vector filtering effect. We also demonstrate that the CPL enhances the difference
between the conductance of the parallel and antiparallel magnetized configurations,
which in turn leads to a significant increase in tunneling magnetoresistance (TMR),
even reaching TMR=1. In particular, under the combined action of polarized light
and gate voltage, the TMR in the conduction band region increases, while the TMR
in the valence band region decreases. Our results will contribute to the development
of optically controllable TMR devices.