Tuninggfactors of core-shell nanoparticles by controlled positioning of magnetic impurities

Abstract

We present a theoretical platform for modeling the electronic and magneto-optic properties of magnetically doped core-shell nanoparticles that has, as a central prediction, a mechanism by which the g-factors in these nanoparticles can be tuned over a wide range by controlled positioning of magnetic impurities. We illustrate this effect for wide gap Mn-doped CdS-ZnS core-shell particles and point out several unexpected trends that merit extended experimental investigation. Structure-property relations are also discussed. The ability to tune g-factors will make core-shell nanostructures viable candidates for spintronic applications, and the comprehensive modeling approach outlined here will be a powerful tool for predicting their properties as well as for optimizing the design of novel spintronic devices.

Dilute Magnetic Semiconducting Quantum Dots: Smart Materials for Spintronics

“…This happens due to the presence of the magnetic ions inside the material and the tendency to align themselves in the direction of the applied magnetic field. Theoretical modeling of magneto-optical and electronic property of core-shell nanoparticles of CdS-ZnS, doped with magnetic impurities of Mn showed that, these nanocrystals can give an attuned value of g over a wide range and make them suitable for spintronics devices, if the position of the magnetic impurities can be controlled [63]. Spectral fingerprints of the spin-spin interactions between the host excitons and the dopant is also revealed by single particle spectroscopy with discrete projections of individual Mn +2 ions observed from emission peaks.…”

Recent Advances in Magnetic Ion-Doped Semiconductor Quantum Dots

“…In fact, theoretical modelling of electronic and magnetooptical properties of core-shell nanoparticles doped with magnetic impurity, i.e. Mn-doped CdS-ZnS, predicts that, by controlling the position of magnetic impurities, the g factor in these nanocrystals can be attuned over wide range and forge them as potential candidates for spintronic applications 57 . Spectral fingerprints of spinspin interaction between the dopant and excitons of the host are also revealed by single-particle spectroscopy with discrete spin projections of individual Mn 2+ ions as obtained from spectrally well-resolved emission peaks.…”