Abstract
A method of synthesis of single-domain nanoparticles of (Fe 1-x Ni x )Fe 2 O 4 solid solutions of oxide ferrimagnetics (where х = 0÷1) has been developed. To suppress coagulation of particles during their synthesis, we used sodium chloride as an indifferent dispersant. After washing, the precipitate was recrystallized at 373 K for the time required for forming particles of a certain size. Then the precipitate was washed in acetone once more and kept in ethyl alcohol. The synthesized products are characterized by X-ray diffraction. Magnetic moment hysteresis loops were measured with use of a laboratory vibrating magnetometer at the room temperature. Demagnetized nanoparticles of (Fe 1-x Ni x )Fe 2 O 4 solid solutions were used as specimens. To suppress interparticle interactions, the nanoparticles were distributed in paraffin matrices. Materials with the known value of saturation magnetization (M s ) were used as the reference specimen: the tested specimen of nickel and the Fe 3 O 4 (98 %) nanoparticles fabricated by Nanostructured & Amorphous Materials Inc., USA. The dependences of saturation magnetization and coercive force on nickel content have been studied. The synthesized material may be applied in micro- and optoelectronics, electrical engineering, biomedicine and other fields.
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