Mössbauer spectrometry, magnetization measurements and differential scanning calorimetry were used to investigate the microstructure and hyperfine interactions in the nanocrystalline alloy obtained by heat treatment of the original amorphous precursor at the temperature of for 1 hour. transmission Mössbauer spectra were taken in the temperature range 5-475 K without and with external magnetic field oriented parallel and perpendicular to the ribbon-shaped sample. The as-quenched state of the alloy was also investigated. The Mössbauer effect measurements confirmed the presence of -Fe phase upon nanocrystallization. Magnetic states of Fe atoms in amorphous and interfacial regions are studied via distributions of hyperfine fields.