NiFe2O4 nanorod: porosity effect on spin canting, quadrupole splitting and hyperfine magnetic properties
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DOI: 10.1088/2053-1591/2/4/046102
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摘要: Porous nickel ferrite nanorods having diameter ?200 nm and length ?2.5 to 3.0 ?m were synthesized by microemulsion method followed calcination at 450 ?C. The morphology structure of the final as well intermediate materials, formed during this method, characterized x-ray diffraction, field emission scanning electron microscope, high resolution transmission microscope Fourier transform infrared spectroscopy. Positron annihilation spectroscopy was used identify structural defects such vacancies surface disorder, find out porosity nanorods. M?ssbauer determine cation distribution magnetic hyperfine property Detailed characterization measuring magnetization a function temperature examined physical measurement system SQUID magnetometer, respectively. reduced saturation (Ms?=?20.3 emu gm?1) enhanced coercive (Hc?=?37 Oe) our samples explained on basis effect. Moreover, formation mechanism effect precursor materials also discussed.
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