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Room Temperature Ferromagnetism in Lithium-Doped ZnO

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6 Author(s)
Ran, C.J. ; State Key Lab. for Adv. Metals & Mater., Sch. of Mater. Sci. & Eng., Univ. of Sci. & Technol. Beijing, Beijing, China ; Xu, X.G. ; Yang, H.L. ; Wang, Y.K.
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Here we report our study on the lithium-doped ZnO films prepared by sol-gel method. The films are polycrystalline wurtzite structure and the average particle size is about 50 nm. All the films are ferromagnetic, and the film with Li content of 8 at. % has the largest saturation magnetization of about 55 memu/g. The photoluminescence spectra show that the films have weak emission near ultraviolet region and strong emission in visible regions. The Li atoms in Zn sites can induce Zn vacancies and a low acceptor level in the energy gap, which are required for ferromagnetism. The first-principles calculations demonstrate that the ferromagnetism in the Li-doped ZnO originates from the induced magnetic moment of oxygen atoms in the nearest neighbor sites to Li-Zn vacancy pair.

Published in:

Magnetics, IEEE Transactions on  (Volume:48 ,  Issue: 11 )

Date of Publication:

Nov. 2012

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