Ultraviolet Laser Action in Ferromagnetic Zn1−xFexO Nanoneedles
1 School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang, 639798, Singapore
2 Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
3 Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-Cho, Showa-Ku, Nagoya, 466-8555, Japan
Nanoscale Research Letters 2009, 5:247-251 doi:10.1007/s11671-009-9473-9Published: 1 November 2009
Fe-doped ZnO nanoneedles (NDs) were fabricated by an Ar+ ion sputtering technique operated at room temperature. The as-grown samples show both ferromagnetic and lasing properties. The saturated magnetization moment was measured from 0.307 to 0.659 emu cm−3 at the field of 10 kOe with various Fe concentrations. Intense ultraviolet random lasing emission was observed from Zn1 − xFexO NDs at room temperature. The X-ray photoelectron spectroscopy result reveals that the doped Fe atoms occupy the Zn sites and lead to a decrease in oxygen deficiency.