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Indian Journal of Engineering and Materials Sciences (IJEMS) >
IJEMS Vol.11 [2004] >
IJEMS Vol.11(4) [August 2004] >
| Title: | Variable temperature electron paramagnetic resonance investigations of an ionic ferrofluid |
| Authors: | Gupta, S K
Pant, R P
Arora, Manju |
| Issue Date: | Aug-2004 |
| Publisher: | CSIR |
| IPC Code: | Int. Cl.7 H01F 1/44 |
| Abstract: | An aqueous based ionic ferrofluid has been
studied by EPR spectroscopy technique from room temperature to liquid nitrogen
temperature to detect the magnetic phase transitions and their variation at low
temperatures. The line-width of EPR signal has been found to increase with
decreasing temperature and this has been assigned to magnetic phase transition
from ferromagnetic to a spin glass or cluster glass state mainly due to
freezing of the carrier fluid. Line-width variation with temperature also
suggests that bulk rotation mechanism is the dominant mode of relaxation. Any
evidence of the presence of super-paramagnetism has not been observed. |
| Page(s): | 305-308 |
| ISSN: | 0975-1017 (Online); 0971-4588 (Print) |
| Source: | IJEMS Vol.11(4) [August 2004]
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