Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1529989 | Materials Science and Engineering: B | 2010 | 7 Pages |
Abstract
With the advent of molecular magnets the quest for suitable high density magnetic storage materials has fuelled further research in this area. Here in this report, we present a detailed mechanistic investigation of thermal decomposition of cyclopentadienyl cobalt [CoCp(CO)2] precursor where Cp is the cyclopentadienyl moiety. The reaction revealed the formation of cobalt nanoparticles (Co-NPs) through an isolable reaction intermediate characterized as a Single Chain Magnet (SCM), [Co(Cp)2]2CoCl4 (1). The SQUID magnetic measurements showed the presence of very strong antiferromagnetic interactions between Co2+ ions. The zero-field cooled (ZFC) and field cooled (FC) magnetization curves branch out below 5Â K and there is evidence for frequency dependent complex susceptibility along with a maximum observed around 2.5Â K. The optical studies indicated that the Co2+ d-d transition is influenced by the polarity of the solvents. The cobalt nanoparticles (Co-NPs) were obtained, either directly from 1 or from its precursor. They are spherical in shape with a mean size 15Â nm, have fcc crystal structure and were found to be ferromagnetic at room temperature.
Related Topics
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Authors
G. Balaji, Rohini M. Desilva, V. Palshin, N. Desilva, G. Palmer, Challa S.S.R. Kumar,