"Double stranded antiferromagnetic helix as an efficient spin filter" by Debjani Das Gupta, Santanu K. Maiti et al.
 

Double stranded antiferromagnetic helix as an efficient spin filter

Article Type

Research Article

Publication Title

Results in Physics

Abstract

We report a large degree of spin filtration in a double stranded (ds) antiferromagnetic helix (AFH) system. Generally spin channel separation is not possible when a magnetic system possesses a vanishing net magnetization. But we show that a highly polarized spin current can be obtained through the ds AFH when it is subjected to a transverse electric field. Describing the physical system within a tight-binding framework, spin-dependent transport phenomena are studied using the well known Green's function formalism. The effects of chirality (left-handed and right-handed), electric field, electronic hopping (short-range and long-range) in each strand, system temperature, and size of the helix on spin filtration are critically investigated. Two different configurations of magnetic moments in the helix are taken into account, for a more general description. Suitably adjusting the physical parameters, almost cent percent spin polarization can be substantiated and that feature persists even for a broad parameter range. Our analysis may open up a new direction for achieving spin-selective electron transmission and designing of controlled spintronic devices using similar kinds of fascinating helical magnetic systems.

DOI

https://10.1016/j.rinp.2023.106918

Publication Date

9-1-2023

Comments

Open Access, Gold

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