In this study, we investigated the effect of crystalline structures on the magnetic properties of the Fe-based amorphous powder. We intentionally produced uniformly dispersed nanocrystallites inside the Fe-based amorphous powder using a combined process of mechanical milling and thermal annealing. In the case of powder produced after 30 min of ball milling followed by annealing at 400 degrees C, coercivity was decreased by 96.88% from 3698.73 to 115.49 A/m, and magnetization was increased 2.60% from 1.92 x 10(-4 )to 1.97 x 10(-4) Wbm/kg. The simultaneous improvement of coercivity and magnetization can be attributed to the homogeneous generation of a small number of nanocrystallites as well as the release of residual stress. (C) 2018 Elsevier B.V. All rights reserved.