Abstract
Magnetic nanoparticles of magnetite (Fe 3O 4) and NiCuZn-doped magnetite (Ni 0.35Cu 0.15Zn 0.5Fe 2O 4) were prepared by coprecipitation and by sol–gel combustion methods accordingly. The average size, d, of magnetite nanoparticles ( d = 12 nm) and the NiCuZn ferrite nanoparticles ignited at about 250 °C ( d = 30 nm) was estimated from X-ray diffraction patterns. The Mössbauer spectroscopy revealed the existence of the paramagnetic doublet in both samples. For magnetite, coercive force of about 400 Oe was found at 5 K. Likewise, the coercive field of the NiCuZn-doped magnetite nanoparticles decreases with Fe 2+ substitution at low temperature (260 Oe). This behavior can be explained taking into account the fact that the magnetocrystalline anisotropy constant of Fe 3O 4 is higher than that of NiCuZn ferrite.
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