The effect of milling speed on the magnetic properties of mechanically alloyed Fe-45%Ni powders

FeNi-based alloys are commonly used as soft magnetic materials, exhibiting high permeability, low coercivity and high saturation magnetization. The present study is focused on the effect of the milling speed (vial and disc rotation speed) on the magnetic properties of nanocrystalline Fe-45 wt. % Ni powders. The phase analysis and the structural properties were characterized by the use of X-ray diffraction. Structural parameters including lattice parameter, crystalline size and lattice strain were obtained from Rietveld's powder structure refinement analysis of X-ray powder diffraction data. The magnetic measurements were performed, using a vibration sample magnetometer (VSM) at room temperature. The results showed that the higher milling speed leads to larger lattice parameter, lower crystalline size, higher saturation magnetization and lower coercivity of the investigated system.