Dept. of Solid State Electron., Huazhong Univ. of Sci. and Technol., Wuhan 430074, People's Republic of China
Univ. of Toronto M5S 1A4, Canada
The ferroelectric domain layer wave (FDLW) in the ABA type 180(degrees) domain sandwich has been discussed. The polarized direction of A material is opposite to that of B material. The results show that there exist two types of ferroelectric domain layer waves in the structure. One is the FDLW of symmetric vibration [X. Li, J. Appl. Phys. 56, 88 (1984)], another is the FDLW of asymmetric vibration. The asymmetric vibration FDLW is a new FDLW, it has a cutoff frequency. From the dispersion relation of the two modes, it is shown that the frequency of the asymmetry mode is higher than the frequency of the symmetry mode. The amplitudes of displacement fields and potential fields of the asymmetry mode are smaller than that of the symmetry mode in the B layer. The system that is composed of the different A, B materials have been analyzed and the general dispersion relation is given; it has a very simple formation, and the relations between the parameter of A, B material and dispersion relation have been discussed.