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|Title:||Ferromagnetic amorphous carbon derived from low molecular weight organic compounds|
Mondal, Bhola Nath
|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<sup>-4</sup> and 5.5 × 10<sup>-4 </sup>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<sup>-4 </sup>emu. Hence, the origin of ferromagnetism is partly intrinsic in nature.|
|ISSN:||0975-1017 (Online); 0971-4588 (Print)|
|Appears in Collections:||IJEMS Vol.17(3) [June 2010]|
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