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Title: Ferromagnetic amorphous carbon derived from low molecular weight organic compounds
Authors: Dasgupta, Prabal
Mondal, Bhola Nath
Issue Date: Jun-2010
Publisher: CSIR
Abstract: Recently ferromagnetic signals have been observed in host of carbonaceous materials. In this paper, we report that the simple combustion products of low-molecular weight aromatic compounds like toluene and naphthalene clearly show ferromagnetic signals at 300 and 10 K with coercivity as low as »-70 Oe and -100 Oe at 300 K and 10 K respectively and saturation magnetization as high as 5.1 × 10-4 and 5.5 × 10-4 emu at 300 K for toluene and naphthalene carbon respectively. These materials have been found to be air-stable at room temperature and they do not strictly obey Curie-Weiss law. The combustion products were characterized with the aid of Magnetometric studies, FTIR, SEM and TEM. Atomic absorption spectrophotometric analysis reveals that among ferro/ferrimagnetic contaminants, only iron is present in such a low concentration that it cannot account for a saturation magnetization as high as 5.5 × 10-4 emu. Hence, the origin of ferromagnetism is partly intrinsic in nature.
Page(s): 224-230
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.17(3) [June 2010]

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