The magnetoelastic properties of as-quenched and annealed Fe73.5−Al Si13.5B9Cu1Mo3 (x=0,2,4,6) alloys

Abstract The effects of substitution of Fe by Al on the magnetoelastic properties of the Fe 73.5 Si 13.5 B 9 Cu 1 Mo 3 composition have been measured on amorphous as-quenched and nanocrystalline annealed samples. This substitution of Fe by Al decreases the saturation polarization, J S , and the effective anisotropy, 〈 K 〉, and increases the saturation Young's modulus, E S , in the as-quenched samples. The magnetic field dependence of Young's modulus, E ( H ), measured by the magnetoelastic resonance method and analyzed by the moment rotation model, has been used to estimate saturation magnetostriction, λ S , in the as-quenched and annealed samples. Results show that, for the as-quenched samples, there is no correlation between the estimated saturation magnetostrictions and the percentage of Al. For the 4% atomic Al samples, annealed between 500°C and 560°C, the estimated λ S decreased with the annealing temperature to 2 ppm.