کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1529989 995782 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Reaction pathway towards formation of cobalt single chain magnets and nanoparticles
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Reaction pathway towards formation of cobalt single chain magnets and nanoparticles
چکیده انگلیسی
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 5 K and there is evidence for frequency dependent complex susceptibility along with a maximum observed around 2.5 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 15 nm, have fcc crystal structure and were found to be ferromagnetic at room temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: B - Volume 167, Issue 2, 15 March 2010, Pages 107-113
نویسندگان
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