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

## TL;DR

This paper theoretically studies magnetotransport in phosphorene-based F/N/F structures, revealing giant magnetoresistance, tunable conductance, and sensitive spin-transfer torque effects, with potential applications in spintronic devices.

## Contribution

It introduces a theoretical model of phosphorene F/N/F structures exhibiting giant magnetoresistance and tunable transport properties, highlighting differences from graphene-based systems.

## Key findings

- Giant magnetoresistance can be tuned to unity.
- Conductance shows a minimum at parallel and maximum near antiparallel magnetization.
- Spin-transfer torque is highly sensitive to chemical potential and exchange field.

## Abstract

We theoretically investigate the unusual features of the magnetotransport in a monolayer phosphorene ferromagnetic/normal/ferromagnetic (F/N/F) hybrid structure. We find that the charge conductance can feature a minimum at parallel (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 with the N region of $n$-type doping. In particular, the proposed structure exhibits giant magnetoresistance, which can be tuned to unity. This perfect switching is found to show strong robustness with respect to increasing the contact length and tuning the chemical potential of the N region with a gate voltage. We also explore the oscillatory behavior of the charge conductance or magnetoresistance in terms of the size of the N region. We further demonstrate the penetration of the spin-transfer torque into the right F region and show that, unlike graphene structure, the spin-transfer torque is very sensitive to the chemical potential of the N region as well as the exchange field of the F region.