Since the propagation properties of magnetoelastic wave (MEW) in amorphous magneto-strictive ribbons and/or films depend on the magnitude and the direction of the in-plane uniaxial anisotropy, control of the anisotropy is considered to be of essential importance to produce reliable and prominent magneto-acoustic transducers. We have examined the effect of thermal treatment on the delay time properties of MEW in (Fe, Ni) base rapid quenched ribbons with large magnetostriction (λs ≅ 30ppm), where annealing was performed by applying a transverse magnetic field of 700 Oe and a longitudinal tensile strain. Although the experimental results are rather complicated, it is found that the optimal annealing condition which exhibits the maximum change in delay time due to external magnetic field exists.
