Some magnetic properties of nanoperm alloy after irradiation

Transmission Fe-57 Mossbauer spectrometry was used to study the microstruct ural and magnetic changes induced by neutron irradiation of nanocrystalline Fe-Zr-B alloy. Measurements were performed in the temperature range from 7 7 K up to 500 K. The evolutions of both the hyperfine field distribution, t he average hyperfine field value, the mean orientation of the ferromagnetic domains and the value of the Curie temperature are consistent with short-r ange atomic order changes resulting from the neutron irradiation damages. I n addition, the neutron irradiation affects significantly the proportions o f amorphous, crystalline and interfacial phases. The results of Mossbauer s pectrometry were correlated with those obtained by X-ray diffraction.