Effect of P/B ratio on the thermal stability, soft magnetic properties and magnetostriction properties of Fe₈₀B_14−xP_xSi₅C₁ amorphous alloys

This work emphases on the effect of P/B ratio in Fe₈₀B_14−xP_xSi₅C₁ (x = 0, 1, 2, & 3 at%) amorphous alloys on the thermal stability, soft magnetic characteristics, and magnetostriction properties. The addition of P in Fe₈₀B_14−xP_xSi₅C₁ (x = 0, 1, 2, & 3 at%) amorphous alloys has a significant positive influence on the GFA. The addition of P element enhances the resistance to crystallization of amorphous alloys and broaden the optimal annealing temperatures range. The coercivity (H_c) of the Fe₈₀B_14−xP_xSi₅C₁ (x = 0, 1, 2, & 3 at%) amorphous alloys is reduced from 15.6 to 9.03 A/m. The Fe₈₀Si₅B₁₂C₁P₂ amorphous alloy exhibits excellent soft magnetic characteristics at the annealing temperature of 613 K for 3 min, with a B_s of 1.59 T and H_c of 3.8 A/m. Mössbauer spectroscopy have been used to investigate the origin of the variations in the B_s and H_c of the amorphous alloy after annealing. The saturation magnetostriction coefficient (λ_s) of Fe₈₀B_14−xP_xSi₅C₁ (x = 0, 1, 2, & 3 at%) amorphous alloy decreases after P element doping and annealing treatment, which can be used to explain the change of H_c.