Spin-polarized transport in a δ-doped magnetic-barrier nanostructure

Abstract

We theoretically investigate the electron spin transport properties through a δ -doped magnetic-barrier nanostructure, which can be realized experimentally by depositing two identical ferromagnetic stripes with the opposite in-plane magnetization on the top of a semiconductor heterostructure in parallel configuration and by using atomic layer doping technique. The δ -doping dependent transmission, conductance and spin polarization are calculated exactly by analytically solving Schrödinger equation of the spin electron. It is found that the electronic spin-polarized behavior in this device can be manipulated by changing the weight and/or the position of the δ -doping. Therefore, such a device can be used as a controllable spin filter, which may be helpful for spintronics applications. • Spin-polarized transport in a δ -doped magnetic-barrier nanostructure is explored. • Both magnitude and sign of spin polarization depend on the δ -doping. • A controllable spin filter can be achieved for spintronics applications.