Ferromagnetic resonant tunneling diodes as spin polarimeters and polarizers
Mesoscale and Nanoscale Physics
2008-07-12 v1 Materials Science
Abstract
A method for measuring the degree of spin polarization of magnetic materials based on spin-dependent resonant tunneling is proposed. The device we consider is a ballistic double-barrier resonant structure consisting of a ferromagnetic layer embedded between two insulating barriers. A simple procedure, based on a detailed analysis of the differential conductance, allows to accurately determine the polarization of the ferromagnet. The spin-filtering character of such a system is furthermore addressed. We show that a 100% spin selectivity can be achieved under appropriate conditions. This approach is believed to be well suited for the investigation of diluted magnetic semiconductor heterostructures.
Keywords
Cite
@article{arxiv.cond-mat/0212242,
title = {Ferromagnetic resonant tunneling diodes as spin polarimeters and polarizers},
author = {Francesco Giazotto and Fabio Taddei and Rosario Fazio and Fabio Beltram},
journal= {arXiv preprint arXiv:cond-mat/0212242},
year = {2008}
}
Comments
4 pages, 2 figures