Open Access Nano Express

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

Daqiang Gao1, Zhenhua Shi1, Yan Xu2, Jing Zhang1, Guijin Yang1, Jinlin Zhang1, Xinhua Wang1 and Desheng Xue1*

Author Affiliations

1 Key Lab for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, 730000, Lanzhou, People’s Republic of China

2 Department of Physics, Xinxiang University, 453003, Xinxiang, People’s Republic of China

For all author emails, please log on.

Nanoscale Research Letters 2010, 5:1289-1294  doi:10.1007/s11671-010-9640-z

Published: 22 May 2010

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.

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