The magnetoelastic properties of as-quenched and annealed Fe73.5−xAlxSi13.5B9Cu1Mo3 (x=0,2,4,6) alloys

The effects of substitution of Fe by Al on the magnetoelastic properties of the Fe73.5Si13.5B9Cu1Mo3 composition have been measured on amorphous as-quenched and nanocrystalline annealed samples. This substitution of Fe by Al decreases the saturation polarization, JS, and the effective anisotropy, 〈K〉, and increases the saturation Youngʹs modulus, ES, in the as-quenched samples. The magnetic field dependence of Youngʹs modulus, E(H), measured by the magnetoelastic resonance method and analyzed by the moment rotation model, has been used to estimate saturation magnetostriction, λS, 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 λS decreased with the annealing temperature to 2 ppm.