Propagation characteristics of magnetoelastic waves in amorphous ribbons carrying field-induced anisotropy

Variable delay characteristics of magnetoelastic waves due to bias-fields in amorphous ribbons, which contain two kinds of transition elements and carry a field induced anisotropy, are studied. It is shown that the theoretical results obtained by considering the direction of the field induced anisotropy, the magnitude of the saturation magnetization and magnetostriction, and the ribbon thickness as significant factors affecting MEW propagation velocity are in good agreement with experiment. When the field-induced anisotropy is parallel to the ribbon width direction, a large change of MEW velocity in FeNiB ribbons is observed. The rate of change is almost the same amount as that of the FeNiB ribbons. In that case, the delay rate of MEW velocity increases monotonically with increasing bias-field. Maximum delay rates of 19% at a signal frequency of 100 kHz, 12.5% at 300 kHz and 5% at 600 kHz are obtained for the (Fe_0.5Ni_0.5)₈₀P₁₄B₆ ribbon of 10 μm thickness. The delay rate in the FeCoB ribbons is not large, and the maximum delay rate of 6.2% is measured at 100 kHz