Surface acoustic wave attenuation in magnetic bubble garnet films

The magnetic field dependence of the surface acoustic wave (SAW) attenuation in magnetic bubble garnet films has been experimentally investigated. SAW delay lines have been fabricated on magnetic bubble garnet films. Interdigital transducers on a piezoelectric layer (zinc oxide film sputtered on top of the garnet film) have been used for acoustic wave generation and detection. Results of the attenuation measurements for different magnetic field orientations with respect to the SAW propagation direction are presented. The maximum increase in the SAW attenuation was observed when the applied dc magnetic field H was parallel to the surface wave propagation vector k. Minimum change in the SAW attenuation was observed when the magnetic field was applied perpendicular to k.