Induced anisotropy and magnetoelastic properties in Fe-rich metallic glasses

Magnetoelastic measurements have been performed on metallic glasses of composition (Fe0.79Co0.21)75+xSi15−1.4xB10+0.4x (x=0,2,4,6,8) by using the resonance–antiresonance method. Samples were obtained in the form of ribbons and annealed under applied field in such a way that a transverse and homogeneous anisotropy was induced in all compositions. The measured magnetoelastic coupling coefficients (k) are about 0.8 in the annealed samples. The quantity E0/ES, that is the initial to saturation Youngʹs modulus ratio, is close to 1 for all compositions, and is an indicator of the colinearity of the magnetic moments around the direction of the induced easy axis. The dependence of Youngʹs modulus on the applied magnetic field (or ΔE effect) has also been simulated following a phenomenological model. There is agreement between experimental data and simulation as far as the canting of the magnetic moments is a distributed function around the mean induced easy axis direction, for each sample, is taken into account.