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The magnetic properties of polycrystalline samples of isotopically enriched iron with the content of isotope 56Fe 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 56Fe is by 4.6% higher than in natFe. There is actually no difference in saturation intensity Bs of monoisotopic 56Fe 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 56Fe can be explained by the difference in structure and content of impurities in the studied samples.
Keywords: Monoisotopic 56Fe, natural iron, phase composition, microstructure, magnetic properties© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.