Characterization of structures and novel magnetic response of Fe87.5Si7Al5.5 alloy processed by ball milling

► The water atomized Fe87.5Si7Al5.5 (Wt.%) alloy was processed by ball-milling. ► The microstructure and magnetic properties of alloy changed following milling. ► The powders milled for 10 h have the largest Ms and strongest reflection loss. ► The permeability of the powders milled for 2 h is the largest. ► The charge exchange between Fe and Si is discussed base on first-principles.