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Nanomaterials 2015, 5(2), 885-894; doi:10.3390/nano5020885

Electronic Structure and Magnetism of Mn-Doped ZnO Nanowires

1
College of Physics and Electronic Information, Yanan University, Yanan 716000, China
2
Department of Physics, Dongguk University, Seoul 100-715, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Lorenzo Rosa
Received: 10 April 2015 / Revised: 4 May 2015 / Accepted: 21 May 2015 / Published: 27 May 2015
(This article belongs to the Special Issue Nanophotonic Materials)
View Full-Text   |   Download PDF [1009 KB, uploaded 27 May 2015]   |  

Abstract

The geometric structures, electronic and magnetic properties of Mn-doped ZnO nanowires were investigated using density functional theory. The results indicated that all the calculated energy differences were negative, and the energy of the ground state was 0.229 eV lower than ferromagnetic coupling, which show higher stability in antiferromagnetic coupling. The calculated results indicated that obvious spin splitting phenomenon occurred near the Femi level. The Zn atoms on the inner layer of ZnO nanowires are easily substituted by Mn atoms along the [0001] direction. It was also shown that the Mn2+-O2−-Mn2+ magnetic coupling formed by intermediate O atom was proved to be caused by orbital hybridization between Mn 3d and O 2p states. The magnetic moments were mainly attributed to the unpaired Mn 3d orbitals, but not relevant with doping position of Mn atoms. Moreover, the optical properties of Mn-doped ZnO nanowires exhibited a novel blue-shifted optical absorption and enhanced ultraviolet-light emission. The above results show that the Mn-doped ZnO nanowires are a new type of magneto-optical materials with great promise. View Full-Text
Keywords: ZnO; dilute magnetic semiconductors; nanowire; density functional theory; magnetic property ZnO; dilute magnetic semiconductors; nanowire; density functional theory; magnetic property
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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. (CC BY 4.0).

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MDPI and ACS Style

Zhang, F.; Chao, D.; Cui, H.; Zhang, W.; Zhang, W. Electronic Structure and Magnetism of Mn-Doped ZnO Nanowires. Nanomaterials 2015, 5, 885-894.

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