The effect of radiofrequency modulation of Fe-57 hyperfine interaction by rotating magnetic field

The effect of Fe-57 hyperfine interaction radiofrequency (rf) modulation by external rotating magnetic field was studied in thin Permalloy foil by mea ns of Mossbauer spectroscopy. The rf effect was investigated as a function of intensity for several rf field frequencies. The experiments show that th e external rotating rf held causes considerable changes in the hyperfine pa ttern. The obtained spectra are in disagreement with those obtained by Perl ow [Phys. Rev. 172(1968) 319]. They also are inconsistent with magnetostric tion hypothesis. Proceeding from the Mossbauer spectrum analysis one may co nclude that the magnetization of investigated foil changes its direction in a complex manner. However, the undertaken experiments show that the essent ial number of Mossbauer nuclei experience the rotating magnetic held influe nce.