The magnetic and structural properties of FINEMET [Fe73.5Si13.5B9Nb3Cu1 wt%] amorphous powder were investigated after nitrification and mechanical milling. Fe-based amorphous powder were nitrified and crystallized simultaneously at 550 degrees C Using by ammonia (NH3) gas. Nitrified powder exhibited iron nitride phase such Lis gamma'-Fe4N, Fe3N, and of alpha"-Fe16N2. Nitrified particles were more brittle than raw particles. As a result, nanometer-sized nitride powder was fabricated by high-energy hall milling method. The saturation magnetization (M-s) and coercivity (H-c) of nitrified powder were increased due to nitride phase. (C) 2007 Elsevier B.V. All rights reserved.