Synthesis and Magnetic Properties of New Multi-components Spinel Ferrite Nanoparticles

Abstract

We synthesized new multi-components spinel ferrite including Ni, Mn, Zn, Co, and Fe in order to improve the magnetic properties in nanosized particles by using a chemical coprecipitation method. The samples were synthesized in the mole ratios of MxMyFe(1_x+y)OldrFe2O3 (Mx My=Ni, Mn, Zn, Co, 0<Mx+My<1), and the maximum saturation magnetizations of them were measured by VSM. XRD patterns of MxMyFe(1-x+y)OldrFe2O3 nanoparticles showed spinel structure and it was observed by EPMA that the composition of nanoparticles was about the same as stoichiometry of the starting materials. Each maximum saturation magnetization of synthesized samples was 66.1 ~ 83.3 [Aldrm2/kg]. The saturation magnetizations of the samples including Zn2+ have increased prominently. CoZnFeO-Fe2O3 nanoparticles showed the highest saturation magnetization. The relevant mole ratio of CoZnFeO-Fe2O3 was investigated, and the mean diameter of CoZnFeO-Fe2O3 nanoparticles was determined by TEM image. The change of mole ratio affects the saturation magnetization of CoZnFeO-Fe2O3 nanoparticles, which ranges from 2.6 to 83.3 [Aldrm2/kg]. Co0.21Zn0.17Fe0.62OldrFe2O3 particles had maximum saturation magnetization of 83.3 [Aldrm2/kg]. The particle size decreases with the increase in mole ratio of Co2+ and it ranges from 7.8 to 11.3 [nm]. The results indicated that the variation of saturation magnetization was larger than that of the particle size. The saturation magnetization of Co0.21Zn0.17Fe0.62OldrFe2O3 (83.3 [Aldrm2/kg]) increased by 31%, compared with that of FeO-Fe2O3 (63.8 [Aldrm2/kg]). We succeeded at improving the magnetic properties in nanosized particles by synthesizing multi-component spinel ferrite.