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Co nanoclusters as origin of ferromagnetism in sol‐gel synthesized Zn 1‐x Co x O (x = 0.05, 0.10 and 0.15) samples
Author(s) -
Sharma V. K.,
Varma G. D.
Publication year - 2008
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200811179
Subject(s) - nanoclusters , ferromagnetism , crystallite , annealing (glass) , magnetization , analytical chemistry (journal) , materials science , paramagnetism , sol gel , crystallography , chemistry , nanotechnology , metallurgy , condensed matter physics , magnetic field , chromatography , physics , quantum mechanics
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. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)