Mossbauer research of Fe/Co nanotubes based on track membranes

Fe/Co nanostructures obtained by template synthesis have been researched in this study. It was shown that the obtained nanostructures are single-phase Fe/Co nanotubes with a high degree of polycrystallinity and body-centered cubic structure with a length of 12 μm, possessing diameter of 110 ± 5 nm, and wall thickness of 18–20 nm. The direction of easy magnetization axis lies along the nanotubes axis due to the anisotropy shape of the nanotubes. Mossbauer spectroscopy showed that the hyperfine magnetic field (Hn)(Hn) values on 57Fe nuclei increase with increasing number of Co atoms near Fe atoms. Substitution of one Fe atom on Co atom leads to an increase of (Hn)(Hn) to approximately 9.0 ± 0.4 KOe, herewith shift of the Mossbauer line decreasing to about 0.004 ± 0.002 mm/s. The local magnetic texture along the nanotubes axis was found with the average angle between magnetic moment and the nanotubes axis ϑ¯=25-29°.