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Impact of Surface on the d^ Ferromagnetism of Lithium-Doped Zinc Oxide Nanowires
We present a first-principles study on the impacts of the surface on the ferromagnetism (FM) induced by non-magnetic defects (lithium substitutional dopants at zinc sites Li Zn and zinc vacancies V Zn ) of zinc oxide (ZnO) nanowires. We show that unlike bulk ZnO structures, both Li Zn and V Zn are a...
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Published in: | IEEE transactions on magnetics 2014-06, Vol.50 (6), p.1-7 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | We present a first-principles study on the impacts of the surface on the ferromagnetism (FM) induced by non-magnetic defects (lithium substitutional dopants at zinc sites Li Zn and zinc vacancies V Zn ) of zinc oxide (ZnO) nanowires. We show that unlike bulk ZnO structures, both Li Zn and V Zn are able to induce d 0 FM in ZnO nanowires. While the structural confinement at the nanowire surface is found to play a key role in the FM induced by Li Zn , the reconstruction of the surface tunes the defect-induced FM. By suppressing the surface reconstruction, we find that a Li Zn and a V Zn , regardless of their position, induce the same magnetic moments of 0.71 and 2.00 μ B (μ B is the magneton Bohr), respectively. The steady correlation between the defect-induced FM, the dangling bonds introduced at these defects, and the local structural reconstruction surrounding these defects is unveiled. Finally, we discuss the saturation of the magnetic moment as the defect density increases. |
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ISSN: | 0018-9464 1941-0069 |
DOI: | 10.1109/TMAG.2014.2299972 |