Soft magnetic core having excellent high-current DC bias characteristics and core loss characteristics and method of manufacturing same

A method of manufacturing soft magnetic cores having an excellent high current DC biased characteristic and an excellent core loss characteristic, the method comprising the steps of:

• performing a preliminary heat treatment of Fe-based amorphous metal ribbons prepared by using a rapid solidification process (RSP) and nanocrystallizing the preliminarily heat treated Fe-based amorphous metal ribbons;
• obtaining alloy powders made of nanocrystalline grains obtained by grinding the metal ribbons;
• after classifying the alloy powders, mixing the alloy powders so that a particle size distribution is configured to have a particle size of 75˜100 μm with 10˜85 wt %, a particle size of 50˜75 μm with 10˜70 wt %, and a particle size 5˜50 μm with 5˜20 wt % to thereby obtain mixed powders;
• obtaining a core molded body by adding the mixed powders with a binder and compression molding the mixed powders mixed with the binder;
• and
• performing an annealing treatment of the core molded body, and coating the annealing treated core molded body with an insulating resin, to thus prepare the soft magnetic cores.