A Mossbauer study of spring magnets

In this paper, seven compositions of the Nd/sub x/Fe/sub 100-x-y/B/sub y/ ribbons were prepared by melt spinning method with Nd and B content increasing from 7.3 and 3.6 to 11 and 6, respectively. The alloys were annealed under optimised conditions to obtain a composite material consisting of the hard magnetic Nd/sub 2/Fe/sub 14/B and soft magnetic /spl alpha/-Fe phases. Phase analysis was performed by Mossbauer spectroscopy, complemented by standard X-ray diffraction and hysteresis loop measurements. The influence of alloy composition and annealing conditions of the hyperfine parameters and relative abundance of the phases is studied.