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Journal of Nanomaterials
Volume 2013 (2013), Article ID 408475, 5 pages
http://dx.doi.org/10.1155/2013/408475
Research Article

Spin-Filtering Effects in Würtzite and Graphite-Like AlN Nanowires with Mn Impurities

Faculty of Physics, “Materials and Devices for Electronics and Optoelectronics” Research Center, University of Bucharest, P.O. Box MG-11, Ilfov 077125 Magurele, Romania

Received 14 December 2012; Accepted 28 February 2013

Academic Editor: Yun Zhao

Copyright © 2013 G. A. Nemnes. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Spin transport properties of magnetic nanowire systems—atomic-sized AlN nanowires with additional Mn impurities—are investigated employing ab initio constrained spin density functional theory calculations and nonequilibrium Green’s functions formalism. The analyzed nanowire structures exhibit a stress-induced phase transition, between würtzite and graphite-like configurations. In these quasi-one dimensional systems, the surface states ensure the basic prerequisite in establishing spin and charge transfer, by reducing the relatively large bandgap of the group III nitride semiconductor. The results show in how far this phase transition affects the surface states, focusing on the consequences which appear in the spin-filtering processes.