Issue
EPL
Volume 87, Number 5, September 2009
Article Number 57004
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/87/57004
Published online 17 September 2009
EPL, 87 (2009) 57004
DOI: 10.1209/0295-5075/87/57004

Narrowing of band gap and low-temperature spin glass behavior of FeNi co-doped ZnO nanowires

Javed Iqbal1, Xiaofang Liu1, Abdul Majid2, Dapeng Yu3 and Ronghai Yu1

1   Laboratory of Advanced Materials, Department of Material Science and Engineering, Tsinghua University Beijing 100084, China
2   State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductor, Chinese Academy of Science Beijing 100083, China
3   State Key Laboratory for Mesoscopic Physics, and Electron Microscopy Laboratory, School of Physics, Peking University - Beijing 100871, China

javedsaggu73@yahoo.com
rhyu@tsinghua.edu.cn

received 26 March 2009; accepted in final form 17 August 2009; published September 2009
published online 17 September 2009

Abstract
This letter reports on the Raman, optical and magnetic properties of FeNi co-doped ZnO nanowires prepared via a soft chemical solution method. The microstructural investigations show that the NiFe co-dopants are substituted into wurtzite ZnO nanostructure without forming any secondary phase. The co-doped nanowires show a remarkable reduction of 34 nm (267.9 meV) in the optical band gap, while suppression in the deep-level defect transition in visible luminescence. Furthermore, these nanowires exhibit ferromagnetism and an interesting low-temperature spin glass behavior, which may arise due to the presence of disorder and strong interactions of frustrated spin moments of Ni and Fe co-dopants on the ZnO lattice sites.

PACS
74.25.Gz - Optical properties.
74.25.Ha - Magnetic properties.

© EPLA 2009