Crystallization and Magnetic Properties of Melt-Spun SmCo7-x(Cr3C2)x Alloys

Abstract

The amorphous formation ability, crystallization behavior and magnetic properties of SmCo7 magnets melt-spun at 30 and 40 m/s have been studied. The ribbons melt-spun at 40 m/s exhibit amorphous structure in the range of 0.15x0.25 for SmCo7-x(Cr3C2)x alloys. In the amorphous state, these alloys are soft magnetic with intrinsic coercive field iHc of the order of 40-70 Oe. After annealing at 750 °C for 5 min, the alloy shows enhenced magnetic properties with iHc of 7.98 kOe, Mr of 55.05 emu/g, and Mr of 70.99 emu/g. The MFM image reveals a uniform distribution of individual grains with average size about 20 nm and a domain size about 100250 nm in width. This interaction domain results in the enhancement of the magnetic properties.