Nanocrystalline nickel ferrite (NiFe2O4) with crystallite size ∼9nm has been synthesized by high-... more Nanocrystalline nickel ferrite (NiFe2O4) with crystallite size ∼9nm has been synthesized by high-energy milling method from a mixture of α-Fe2O3 and NiO. Mössbauer spectroscopy, X-ray diffraction, transmission electron microscopy, and magnetization measurements have been used to investigate the structural and magnetic states of mechanosynthesized spinel ferrite. The observed reduction of the magnetization in nanoscale NiFe2O4 is attributed to the mechanically
Thin hexagonal barium hexaferrite particles synthesized using the microemulsion technique were st... more Thin hexagonal barium hexaferrite particles synthesized using the microemulsion technique were studied. A water-in-oil reverse microemulsion system with cetyltrimethylammonium bromide (CTAB) as a cationic surfactant, n-butanol as a co-surfactant, n-hexanol as a continuous oil phase, and an aqueous phase were used. The microstructural and magnetic properties were investigated. The particles obtained were mono-domain with average particle size 280 nm. The magnetic properties of the powder were investigated at 4.2 K and at room temperature. The saturation magnetization was 48.86 emu/g and the coercivity, 2.4 x 105 A/m at room temperature. The anisotropy field Ha and magneto-crystalline anisotropy K1 were 1.4 x 106 A/m and 2.37 x 105 J/m3, respectively.
Nanocrystalline nickel ferrite (NiFe2O4) with crystallite size ∼9nm has been synthesized by high-... more Nanocrystalline nickel ferrite (NiFe2O4) with crystallite size ∼9nm has been synthesized by high-energy milling method from a mixture of α-Fe2O3 and NiO. Mössbauer spectroscopy, X-ray diffraction, transmission electron microscopy, and magnetization measurements have been used to investigate the structural and magnetic states of mechanosynthesized spinel ferrite. The observed reduction of the magnetization in nanoscale NiFe2O4 is attributed to the mechanically
Thin hexagonal barium hexaferrite particles synthesized using the microemulsion technique were st... more Thin hexagonal barium hexaferrite particles synthesized using the microemulsion technique were studied. A water-in-oil reverse microemulsion system with cetyltrimethylammonium bromide (CTAB) as a cationic surfactant, n-butanol as a co-surfactant, n-hexanol as a continuous oil phase, and an aqueous phase were used. The microstructural and magnetic properties were investigated. The particles obtained were mono-domain with average particle size 280 nm. The magnetic properties of the powder were investigated at 4.2 K and at room temperature. The saturation magnetization was 48.86 emu/g and the coercivity, 2.4 x 105 A/m at room temperature. The anisotropy field Ha and magneto-crystalline anisotropy K1 were 1.4 x 106 A/m and 2.37 x 105 J/m3, respectively.
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Papers by Svetoslav Kolev