Varshney, Prateek and Srinet, Gunjan and Kumar, Ravindra and Sajal, Vivek and Sharma, S. K. and Knobel, M. and Chandra, Jeewan and Gupta, Govind and Kulriya, P. K. (2012) Room temperature ferromagnetism in sol-gel prepared Co-doped ZnO. Materials Science in Semiconductor Processing, 15 (3). pp. 314-318. ISSN 1369-8001

PDF - Published Version Restricted to Registered users only Download (715Kb) | Request a copy

Abstract

We report on the high temperature ferromagnetism in Co-doped ZnO samples with 2%, 4% and 6% nominal Co concentrations prepared by the sol-gel method. X-ray diffraction and X-ray photoelectron spectroscopy analyses confirm the absence of metallic Co clusters or any other impurity phases different from wurtzite-type ZnO. It is also observed that Co has occupied Zn sites. UV-visible absorption studies show an increase in band gap with Co concentration. The field dependence of magnetization exhibited clear ferromagnetism at room temperature with saturation magnetization and coercive field of the order of 0.0066-0.0239 emu/g and 149.09-40.31 Oe, respectively. Increase of saturation magnetization value with Co doping indicated that the ferromagnetism in the samples may be due to percolation of bound magnetic polarons.

Item Type:	Article
Additional Information:	copyright for this article belongs to M/s Elsevier
Subjects:	Engineering > Electronics and Electrical Engineering Materials Science Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	19 Aug 2026 11:02
Last Modified:	19 Aug 2026 11:02
URI:	https://npl.csircentral.net/id/eprint/3439

Actions (login required)

View Item