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Synthesis, Magnetic Anisotropy and Optical Properties of Preferred Oriented Zinc Ferrite Nanowire Arrays

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Author(s): Gao Daqiang | Shi Zhenhua | Xu Yan | Zhang Jing | Yang Guijin | Zhang Jinlin | Wang Xinhua | Xue Desheng

Journal: Nanoscale Research Letters
ISSN 1931-7573

Volume: 5;
Issue: 8;
Start page: 1289;
Date: 2010;
Original page

Keywords: ZnFe2O4 | Nanowire arrays | Preferred oriented | Magnetic anisotropy | Optical properties

ABSTRACT
Abstract Preferred oriented ZnFe2O4 nanowire arrays with an average diameter of 16 nm were fabricated by post-annealing of ZnFe2 nanowires within anodic aluminum oxide templates in atmosphere. Selected area electron diffraction and X-ray diffraction exhibit that the nanowires are in cubic spinel-type structure with a [110] preferred crystallite orientation. Magnetic measurement indicates that the as-prepared ZnFe2O4 nanowire arrays reveal uniaxial magnetic anisotropy, and the easy magnetization direction is parallel to the axis of nanowire. The optical properties show the ZnFe2O4 nanowire arrays give out 370–520 nm blue-violet light, and their UV absorption edge is around 700 nm. The estimated values of direct and indirect band gaps for the nanowires are 2.23 and 1.73 eV, respectively.

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