Abstract
The magnetic properties of Nd 4.5Fe 77− x Mn x B 18.5 ( x=0, 1 and 2) nanocomposites prepared by the crystallization of amorphous precursors were investigated. Addition of Mn is found to decrease the crystallization temperature of the amorphous ribbons. The intrinsic coercivity i H c and maximum energy product ( BH) max increase from 2.6 kOe and 9.1 MGOe for x=0 to 3.1 kOe and 10.3 MGOe for x=1, respectively, and the remanence ratio M r/ M s increases from 0.70 to 0.72. The effect of Mn on Curie temperature T C and the thermal stability of M r and i H c were also studied. 57Fe Mössbauer spectra have been recorded for x=0, 1 and 2 ribbons at room temperature and site preference of the Mn atoms in Fe 3B and Nd 2Fe 14B phases is discussed using the Mössbauer spectroscopy.
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