The current status of the Mossbauer investigations of the soft magnetic nanocrystalline alloys produced by utilizing the first step of crystallization of amorphous alloys is discussed. Conventional Mossbauer measurements allow the identification of phases formed due to annealing of amorphous precursor and the evaluation of their relative content.
Unconventional rf-Mossbauer studies utilizing radio-frequency (rf) fields provide information on the soft magnetic nature of the alloys by observing the degree of rf-induced collapse of the hyperfine fields. The Mossbauer experiment in which the rf collapse and rf sidebands effects are used allows the soft nanocrystalline bcc phase to be distinguished from magnetically harder microcrystalline ones.
Qualitative information concerning the distribution of anisotropy fields in the nanocrystalline grains can be inferred from the dependence of the rf collapsed spectra on the rf field intensity. The rf-sidebands effect reveals changes of magnetostriction due to the formation of the nanocrystalline phase. The rf-Mossbauer technique provides a unique opportunity to study the microsctucture and magnetic properties of each phase formed in the amorphous precursor.
The principles of the rf-Mossbauer technique and examples of its application will be discussed for FeZrB(Cu) and FeNiZrB nanocrystalline alloys.

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