Abstract
The paper presents the results of a study of changes in the structural properties and magnetic structure of Fe nanotubes depending on the synthesis conditions. As a method of obtaining, the method of electrochemical synthesis from sulfuric acid electrolyte solutions was used, the voltage range was 1.25 to 2.0 V, with a step of 0.25 V. To study the influence of deposition conditions on the magnetic characteristics and the hyperfine magnetic structure of nanotubes, X-ray diffraction and Mossbauer spectroscopy were used. It has been established that the synthesized nanotubes are whisker-like structures with a textural direction of crystallite growth (110), a body-centered cubic lattice characteristic of the iron phase of the spatial system Im-3m (229). According to the Mossbauer data, the spectra of the studied nanostructures in the general case are a low-intensity Zeeman sextet and a quadrupole doublet characteristic of the paramagnetic state of the Fe2+ and Fe3 cations. The presence of a quadrupole doublet indicates the presence of impurity inclusions in the structure, which leads to a disordering of the magnetic texture, as well as the presence of a large number of cationic vacancies in the crystal structure. During the study, the dynamics of changes in the magnetic texture and the concentration of impurity inclusions from the synthesis conditions were established.