Characterization of a Fe-Based Soft Magnetic Alloy System with High Saturation Magnetization

Abstract

The ratios of Fe/Co and Fe/B in a ferromagnetic alloy system, Fe(87-x-y) Co-x Ti-7 Zr-6 By (x = 20, 30, and 40 at% and y = 2 and 4 at%), which was produced by the melt-spinning technique in the form of thin ribbons, were investigated to improve the saturation magnetization. The thermal properties T-x were in the range of 792.0 K to 838.0 K, and it decreased by decreasing Fe/Co ratio. In the as-spun amorphous ribbons, the saturation magnetization and coercivity ranged from 137.5 emu/g to 164.2 emu/g and from 0.027 Oe to 1.245 Oe, respectively. The optimum Fe/Co ratio for the Fe(83-x) Co-x Ti-7 Zr-6 B-4 system was determined to be 64:36. In other words, the optimum system was Fe-60 Co-25 Ti-7 Zr-6 B-2, which exhibited robust soft magnetic properties, such as a low coercivity of 0.252 Oe, and high saturation magnetization of 164.2 emu/g (1.55 T). Also, in this system, magnetic properties such as the saturation magnetization and coercivity increased with decreasing Fe/Co ratio.