The magnetic properties and microstructures of rare earth lean and boron-rich (Nd 0 95 La 0 05 ) 11 Fe 76 5 Co Ti 2 B 10 5 ( = 0 15) melt-spun ribbons have been investigated. Two magnetic phases, namely -Fe and R 2 Fe 14 B, were found, by thermal magnetic analysis (TMA), in all the ribbons studied. High intrinsic coercivity (iHc) and maximum energy product [(BH)max] values in the range of 14-18.7 kOe and 13.9-18.3 MGOe, respectively, have been achieved in these nanocomposites. Among compositions studied, the Co-substitutions, 10, were found to be effective in increasing the Br and (BH)max, while keeping a high value of iHc. It was evidenced from transmission electron microscopy that the homogeneity, fine grain size, and high volume fraction of the R 2 Fe 14 B phase led to an increase in the iHc and maximum energy product of nanocomposites studied. The optimum magnetic properties of Br = 9 4 kG, iHc = 16 1 kOe and (BH)max = 18 3 MGOe have been obtained on (Nd 0 95 La 0 05 ) 11 Fe bal Co 10 Ti 2 B 10 5 ribbons after an optimum treatment.
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