1985 年 9 巻 2 号 p. 203-206
The propagation of magnetic surface-acoustic-waves (MSAW) are presented on rf-sputtered amorphous Fe-Co-B films deposited on glass substrates. Piézoelectric transducers employing IDT and Al-doped ZnO films were used for excitation and detection of MSAW. Three dominant waves appear in this configuration−two Lamb type waves of (P+SV)-extensional mode and (P+SV)-flexual mode as well as Love (SH) type waves, among which the SH-type waves were the most intensively excited. MSAW were subjected to change by magnetic annealing in a field applied parallel to the sample width. The controllable change in the sound velocity with field reaches as high as 7.7% at 30MHz operation in SH-type waves. This value is several hundred times larger than those reported so far. SH-type waves undergo a marked attenuation depending on field. This is interpreted as follows: The MSAW energy is dissipated mostly in the form of microeddy current loss in metallic films. The dissipation takes place more distinctly in SH-type waves, because these waves propagate concentratedly in the magnetic conductive overlay.