SYNTHESIS OF IRON AND NICKEL NANOPARTICLES AND SOME MAGNETS CHARACTERISTICS

Abstract

This research aims to form and study the magnetic properties of new composite materials based on diamagnetic iron (Fe) matrix containing nanosized nickel metal particles. A high-vacuum device [1] was used for the synthesis of the composite system, and its structural and magnetic properties were studied by transmission electrode microscopy (TEM) and ferromagnetic resonance (FMR). As can be seen from the SEM data, the formed nickel (Ni) nanoparticles are spherical in shape and their sizes are characterized by a narrow distribution function with an average value of 3.2 nm. Analysis of the recorded FMR spectra shows strong interactions between the nanoparticles, their main property exhibiting the properties of magnetic thin films. By laser ablation of a nickel target followed by adiabatic expansion of metal vapor through a narrow nozzle, uniform-sized Ni /Fes were synthesized and a thin-film Nii/ composite was obtained. Butane-based nickel-based nanocomposites contain, in addition to pure nickel, a metastable supersaturated Ni(C) solid solution in the metal core and a carbon coating. The Ni(C) solid solution can decompose both during synthesis and during subsequent annealing, and the completeness and extent of decomposition depends on the synthesis mode and the size of the nickel nanoparticles. The smaller the size, the greater the degree. The magnetization of nanocomposites is determined by several contributions - the presence of the magnetic Ni(C) solid solution and the contribution of the non-magnetic carbon coating, and some contributions to the magnetization may be related to the superparamagnetic behavior of the nanoparticles.