The Influence of Heat Treatment on the Shape of 57Fe Hyperfine Field Induction Distribution in Massive Amorphous Fe61Co10Y8X1B20 (where X = Mo, W)

The paper presents the results of Mossbauer research for massive amorphous alloys Fe61Co10Y8Mo1B20 and Fe61Co10Y8W1B20 manufactured using the method of suction of a liquid alloy into a copper water-cooled mold and subjected to thermal treatment at a temperature of 700K / 60 min and 770K / 210 min. The treatment was carried out below the crystallization temperature and it did not lead to the creation in the volume of alloys of crystalline systems showing long-range order of atoms. M�ssbauer research was performed for low energy milled plates in transmission geometry. Then, numerical analysis of these spectra was performed and the corresponding hyperfine field distributions were obtained 57Fe. It has been shown that isothermal annealing has a big influence on the shape of the hyperfine field distribution. As a result of thermal processing, diffusion of the components took place, which caused the occurrence of diverse environments of iron atoms around the central atom. In the volume of all specimens, there was a lack of topological order in the arrangement of atoms.

Impact of magnetization and hyperfine field distribution on high magnetoelectric coupling strength in BaTiO3–BiFeO3 multilayers

Using conversion electron Mössbauer spectroscopy, interesting correlations of hyperfine field, magnetization, polarization, and magnetoelectric coefficient could be established.

Structure and Magnetic Properties of Aerosol Nanoparticles of Fe and Its Alloys

Structure and magnetic properties of aerosol nanoparticles of Fe and its alloys (FeMn, FeNi, FeNiMn, FePt, FeCr, FeCo, and FeCu) have been reviewed. It has been shown that, compared to a bulk material, the particles have a number of specific features being of much fundamental and applied interest. The effect of both a quenched high-temperature Fe modification and its oxides on the structure and magnetism of nanoparticles has been considered in detail. Particular attention has been paid to the recently observed fine structure in the hyperfine field distribution at iron nuclei in Mössbauer spectra for pure iron and its alloys both as a bulk and aerosol nanoparticles. This phenomenon makes it possible to reveal very weak magnetic interactions in the system under study. The plausible origin of these magnetic interactions has been also discussed.

Mössbauer Spectrometry Study of Spinodal Decomposition in Fe-25Cr-12Co-1Si Alloy during Step Ageing

The local environment issued from the phase decomposition in Fe-25Cr-12Co-1Si alloy during step ageing has been studied by 57Fe Mössbauer spectrometry. The phase decomposition is influenced by both ageing time and temperature. It processes rapidly when ageing temperature is high. The formation of different kinds of (Fe, Co)-rich, Fe-rich and Cr-rich domains with independent hyperfine parameters during phase decomposition was characterized by hyperfine field distribution. The magnetic hardening of the alloy was discussed basing on single domain particle model.