Calculation of the spectral characteristics of an acoustic resonator containing layered multiferroic structure

Abstract

Multifrequency composite acoustic resonators for bulk acoustic waves with piezoelectric and ferromagnetic layers are studied. The structures with a thick ferrite substrate layer and a thin ferrite film on a nonmagnetic dielectric substrate and multilayer structures are considered. A thin piezoelectric layer that is placed between two metal electrodes serves as a transducer. Analytical expressions for the input electric impedance of the electroacoustic transducer are derived for various structures under study in the presence of the transverse control magnetic field. The amplitude-frequency and phase-frequency characteristics of the cavity are numerically calculated. The resonance frequency can be controlled in the interval ±1.2 MHz (about 25% of the intermode distance) due to variations in the magnetic field.