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Journal of Nanoscience Letters 2014, 4: 20
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Research Article
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On the ferromagnetic Cu nanocrystals
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Shital R. Vaidyaa,#, Darshana Y. Inamdara, Arjun K. Pathakb, R. D. Bapatc, Igor Dubenkob, Naushad Alib, Pushan Ayyubc, Sulabha Kulkarnid, Shailaja Mahamunia
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a Department of Physics, University of Pune, Pune 411007, India
b Department of Physics, Southern Illinois University, Carbondale, IL 62901, U.S.A.
c Department of Condensed Matter Physics, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, 400 005, India
d Department of Physics, Indian Institute of Science Education and Research, Pune 411021, India
# Present address: CNR-IOM, Istituto Officina dei Materiali, c/o Area Science Park, SS 14 Km 163.5, I-34149 Basovizza, and Graduate School of Nanotechnology, University of Trieste, Piazzale Europa 1, I-34127 Trieste, Italy
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Abstract |
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A room temperature ferromagnetism (RTFM) is observed in Cu nanocrystals (NCs) capped with amine ligands in contrast to the literature survey indicating presence of ferromagnetic ordering only in S-capped NCs. Cu-N bonds along with Cu-O bonds induce the changes in electron energy levels producing holes in 3d energy levels. Presence of Cu-O and Cu-N bonds is asserted by infra-red spectroscopy. The electron spin resonance measurements (ESR) indicate presence of Cu2+ ions on metallic Cu nanocrystals and thus corroborate the prediction. The present studies support the conjecture that ferromagnetic ordering in metal nanocrystals is a manifestation of surface uncompensated spins. Magnetization as a function of temperature unravels the exchange mechanism.
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Keywords |
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Nanostructures; Room temperature ferromagnetism; Optical properties; Electron spin resonance
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