Externally controlled selective spin transfer through a two-terminal bridge setup

TL;DR

This paper proposes a method to control spin-dependent transport in a magnetic quantum ring-wire system using an external electric field, enabling tunable spin polarization without altering system parameters.

Contribution

It introduces a novel externally controlled spin transport mechanism in a two-terminal setup with magnetic quantum components, emphasizing electric field tuning.

Findings

High spin polarization achievable at specific electric field strengths

Spin currents can be regulated without changing system parameters

Comparison shows advantages over other bridge setups

Abstract

A new way of getting controlled spin dependent transport through a two-terminal bridge setup is explored. The system comprises a magnetic quantum ring which is directly coupled to a magnetic quantum wire and subjected to an in-plane electric field perpendicular to the wire. Without directly changing system parameters, one can regulate spin currents simply by tuning the external electric field under a finite bias drop across the wire. For some particular field strengths a high degree of spin polarization can be achieved and thus the system can essentially be utilized as an externally controlled spin polarized device. A detailed comparison of spin current magnitudes obtained from other bridge setups is also examined to make the present investigation a self contained study.