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The magnetic properties of polycrystalline samples of isotopically enriched iron with the content of isotope 56 Fe 99.945±0.002 at. % were investigated. The samples of monoisotopic iron were preliminarily melted in the environment of argon and annealed in hydrogen. For the sake of comparison the same measurements were carried out on the samples of iron with natural isotopic composition. The quantity and composition of impurities in the samples of natural and monoisotopic iron were equal. The measurements were conducted by the method of vibration magnetometry with the use of the method of automatic vibro-magnetometer VSM-250 (China) using IDAW-2000D VSM test software as well as by induction-pulse method with the use of automated measuring set МK-3E (the Russia) with automatic processing of the obtained data according to GOST 8.377-80 and GOST 12119.1-98. It was found that the value of saturation intensity Js in 56 Fe is by 4.6% higher than in nat Fe. There is actually no difference in saturation intensity Bs of monoisotopic 56 Fe and natural iron within the error in limits of detection of analysis. The difference in the values of coercitive force Нс, residual magnetic induction Br and maximum magnetic permittivity µmax in natural iron and 56 Fe can be explained by the difference in structure and content of impurities in the studied samples.

The nucleation, growth and faceting of Fe3O4–Au nanoparticles is systematically monitored using liquid probes during reaction. Two consecutive processes are obtained, the growth of Fe3O4 spheres on Au seeds and faceting towards octahedral motifs.

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