On Propagation Properties of Lamb-Type and SH-Type Magnetoelastic Waves in Highly Magnetostrictive Slab

While most studies of magnetoelastic waves (MEWs) have dealt with very thin samples, the sample thickness becomes important for Lamb and SH type MEWs. Theoretical and experimental studies on MEW propagation in an infinitely extended slab are reported. Matrix and eigenvalue methods were used in theoretical calculations, while METGLAS 2605CO and 2605S2 samples were employed in experiments. Both calculations and experiments indicated the existence of three fundamental MEW modes, (P + SV) -type flexxural (MEW^f) and SH-type (MEW^s). Whereas the velocity for MEW f-type waves decreased with frequency, agreeing qualitatively with the results of Tsuya et al., the velocity for MEWs tended to increase, a behavior which may be useful for realizing large changes in MEW velocity at high frequencies.