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We theoretically investigate the unusual features of the magnetotransport ina monolayer phosphorene ferromagnetic/normal/ferromagnetic (F/N/F) hybridstructure. We find that the charge conductance can feature a minimum atparallel (P) configuration and a maximum near the antiparallel (AP)configuration of magnetization in the F/N/F structure with $n$-doped F and$p$-doped N regions and also a finite conductance in the AP configuration withthe N region of $n$-type doping. In particular, the proposed structure exhibitsgiant magnetoresistance, which can be tuned to unity. This perfect switching isfound to show strong robustness with respect to increasing the contact lengthand tuning the chemical potential of the N region with a gate voltage. We alsoexplore the oscillatory behavior of the charge conductance or magnetoresistancein terms of the size of the N region. We further demonstrate the penetration ofthe spin-transfer torque into the right F region and show that, unlike graphenestructure, the spin-transfer torque is very sensitive to the chemical potentialof the N region as well as the exchange field of the F region.

Giant magnetoresistance and anomalous transport in phosphorene-based multilayers with noncollinear magnetization