Eur. Phys. J. B (2015) 88: 172
https://doi.org/10.1140/epjb/e2015-60067-8

Regular Article

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

Physics and Applied Mathematics Unit, Indian Statistical Institute, 203 Barrackpore Trunk Road, 700108 Kolkata, India

^a e-mail: santanu.maiti@isical.ac.in

Received: 23 January 2015
Received in final form: 17 April 2015
Published online: 6 July 2015

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.