Double stranded antiferromagnetic helix as an efficient spin filter

Das Gupta, Debjani; Maiti, Santanu K.; Perez, Laura M.; Silva, Judith Helena Ojeda; Laroze, David

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 magnetiza-tion. 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.

Más información

Título según WOS: ID WOS:001072508200001 Not found in local WOS DB
Título de la Revista: RESULTS IN PHYSICS
Volumen: 52
Editorial: Elsevier
Fecha de publicación: 2023
DOI:

10.1016/j.rinp.2023.106918

Notas: ISI