Induced anisotropy and magnetoelastic properties in Fe-rich metallic glasses

Magnetoelastic measurements have been performed on metallic glasses of comp osition (Fe0.79Co0.21)(75+x) Si15-0.4xB10+0.4x (x = 0,2,4,6,8) by using the resonance-antiresonance method. Samples were obtained in the form of ribbo ns and annealed under applied field in such a way that a transverse and hom ogeneous anisotropy was induced in all compositions. The measured magnetoel astic coupling coefficients (k) are about 0.8 in the annealed samples. The quantity E-0/E-S, that is the initial to saturation Young's modulus ratio, is close to I 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 Young's modulus on the applied magnetic field (or DeltaE effe ct) has also been simulated following a phenomenological model. There is ag reement between experimental data and simulation as far as the canting of t he magnetic moments is a distributed function around the mean induced easy axis direction, for each sample, is taken into account. (C) 2001 Elsevier S cience B.V. All rights reserved.