MAGNETIC PROPERTIES OF ISOTOPICALLY ENRICHED 56Fe

Abstract

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.

Study of magnetic properties of isotopically enriched 56Fe at different magnetic field strength values

“…For the study, we used previously prepared 56 Fe and nat Fe samples [1], the isotopic composition of which is shown in Table 1.…”

“…Table 1 Isotopic composition of monoisotopic and natural iron, at.% [1]. Two types of samples were made, differing in shape and geometric dimensions.…”

“…Authors [1] found that the fundamental magnetic properties of natural ( nat Fe) and monoisotopic ( 56 Fe) iron are almost the same. The excess of saturation magnetization (Js) for 56 Fe in comparison with nat Fe is 4.6%, the differences in the values of the coercive force (Hc), residual magnetic induction (Br) and maximum magnetic permeability (µmax) are explained by the difference in the content of impurities.…”

“…The excess of saturation magnetization (Js) for 56 Fe in comparison with nat Fe is 4.6%, the differences in the values of the coercive force (Hc), residual magnetic induction (Br) and maximum magnetic permeability (µmax) are explained by the difference in the content of impurities. This work is a continuation of work [1]. When carrying out it, the same objects of research were used as in [1], but they additionally annealed in high-purity dried hydrogen.…”

“…This work is a continuation of work [1]. When carrying out it, the same objects of research were used as in [1], but they additionally annealed in high-purity dried hydrogen. The quasi-static and dynamic magnetic properties of the studied samples of natural ( nat Fe) and monoisotopic ( 56 Fe) iron were measured in this work at different values of the magnetic field strength and at different frequencies of the alternating magnetic field.…”