Tunable spin polarization in a δ-doped magnetic-electric-barrier nanostructure

Abstract

We report a theoretical study on spin filtering of electrons in a hybrid magnetic-electric-barrier (MEB) nanostructure modulated by δ-doping, which can be realized experimentally by depositing a ferromagnetic (FM) stripe and a Schottky-metal (SM) stripe on top of a semiconductor heterostructure and by using atomic-layer doping technique. δ-doping dependent transmission, conductance and spin polarization are calculated by improved transfer matrix method (ITMM) and Landauer–Bűttiker theory (LBT). It elucidates that a spin filtering still exists in MEB device even a δ-doping is comprised inside. Besides, degree of spin filtering can be manipulated by weight or position of δ-doping, which may result in a doping-controllable spin polarized source for spintronics device applications.