MAGNETIC PROPERTIES OF ISOTOPICALLY ENRICHED 56Fe

The magnetic properties of polycrystalline samples of isotopically enriched iron with the content of isotope Fe-56 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.K-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 J(s) in Fe-56 is by 4.6% higher than in Fe-nat. There is actually no difference in saturation intensity B-s of monoisotopic Fe-56 and natural iron within the error in limits of detection of analysis. The difference in the values of coercitive force H-c, residual magnetic induction B-r and maximum magnetic permittivity mu(max) in natural iron and Fe-56 can be explained by the difference in structure and content of impurities in the studied samples.