Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8158372 | Journal of Magnetism and Magnetic Materials | 2013 | 7 Pages |
Abstract
Nano-particles of CoFe2O4, NiFe2O4 and Co0.5Ni0.5Fe2O4 were synthesized by a two step microemulsion precipitation where inverse micelles of water in hexanol were stabilized using cetyltrimethylammonium bromide. Powder X-ray diffraction analysis and Transmission electron microscopy measurements provided data to clarify the crystal structure and size of the produced nano-particles. Different measurements of magnetic properties at low temperatures of 2Â K revealed that nano-particles of NiFe2O4 represent magnetically soft ferrite with a coercivity â¼40Â kA/m, whereas nano-particles of CoFe2O4 and Co0.5Ni0.5Fe2O4 were magnetically harder with a coercivity of 815 and 947Â kA/m, respectively. Additionally zero field cooling and field cooling measurements provided data for estimating the blocking temperature of the materials produced. For NiFe2O4 this temperature is lower, 23Â K. The blocking temperature of CoFe2O4 of 238Â K and Co0.5Ni0.5Fe2O4 of 268Â K are higher in comparison with NiFe2O4.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
P. PuliÅ¡ová, J. KováÄ, A. Voigt, P. Raschman,