Characterization of Structure and Magnetic Properties of Warm Compacted Ni-Fe-Mo Soft Magnetic Alloy

Surface morphology and basic soft magnetic properties were investigated on Ni80Fe15Mo5 compacted powder alloys. The powder was prepared by grinding of the Ni80Fe15Mo5 sheet, followed by milling and surface smoothing. The powder was warm compacted to get ring shaped compacts, which were then annealed. The effects of surface smoothing on the microstructure and magnetic properties were examined. The relative initial permeability, coercivity and specific electrical resistance measurements were conducted on both un-annealed and annealed samples. The initial relative permeability (at 100 Hz) has increased its value from 120 for non-smoothed sample to 200 after smoothing, and to 3300 after annealing. For annealed non-smoothed sample the initial relative permeability was 1500. The lowest coercivity was measured after powder-smoothing and annealing, where the sample exhibited coercivity of 4.8 A/m. The values of specific electrical resistivity were relatively stable, keeping the value around 1 x 10(-6) Omega m.