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Indian Journal of Engineering and Materials Sciences (IJEMS) >
IJEMS Vol.17 [2010] >
IJEMS Vol.17(3) [June 2010] >
| 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) |
| Source: | IJEMS Vol.17(3) [June 2010]
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