Roy, M. K and Verma, H. C (2006) Quenching of superparamagnetic relaxation in NiFe2O4 nanoparticles at room temperature. J. Phys.: Condens. Matter, 18 (31). 7273-7281 .
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Official URL: http://www.iop.org/EJ/abstract/0953-8984/18/31/021...
Nanoparticles of NiFe2O4 are synthesized using a chemical route involving reactions of nitrates of Ni and Fe, and citric acid. The particles with size as small as 8 nm do not show any superparamagnetic relaxation in room temperature Mössbauer spectroscopy. This suggests that the particular preparation process yields a magnetic structure where the magnetic moments are strong enough to quench superparamagnetism. Over-occupancy in tetrahedral sites is suggested to be a possible explanation.
|Subjects:||Material Science > Nanochemistry|
|Divisions:||Faculty of Engineering, Science and Mathematics > School of Physics|
|Deposited On:||03 Apr 2009 05:24|
|Last Modified:||09 Apr 2009 05:30|
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