Co nanoclusters as origin of ferromagnetism in sol-gel synthesized Zn1-xCoxO (x = 0.05, 0.10 and 0.15) samples

✍ Scribed by V. K. Sharma; G. D. Varma

• Book ID: 102125155
• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 380 KB
• Volume: 43
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.200811179

✦ Synopsis

We report on the structural and magnetic properties of the polycrystalline samples of Zn 1-x Co x O (x = 0.05, 0.10 and 0.15) synthesized via sol-gel route. The air sintered samples of all compositions exhibit paramagnetic behaviour at room temperature, on the other hand the same samples on annealing in Ar/H 2 atmosphere show room temperature ferromagnetism (RTFM) with enhanced magnetization. The value of magnetization increases with the Co concentration (x) in both the air sintered and Ar/H 2 annealed samples. The observed ferromagnetism in the Ar/H 2 annealed Zn 1-x Co x O (x = 0.05, 0.10 and 0.15) samples is attributed to the presence of Co nanoclusters as detected by XRD and FESEM-EDAX.