Effect of Interface Area on Nonlinear Magnetoelectric Resonance Response of Layered Multiferroic Composite Ring

Multiferroic composite structures are widely used in sensing, driving and communication. The study of their magnetoelectric (ME) behavior under various excitations is crucial. This study investigates the nonlinear ME influence of a multilayer composite ring structure consisting of Terfenol-D (TD) magnetostrictive and lead zirconate titanate (PZT) piezoelectric rings utilizing a multiphysics field modeling framework based on the fully coupled finite element method. The ME coupling coefficient of the PZT/TD concentric composite ring is predicted using the linear piezoelectric constitutive model and the nonlinear magnetostrictive constitutive model, which is congruent to the experimental data. The effect of the interface area of a trilayered structure on the coupling performance at the resonant frequency is investigated, considering the magnitude and frequency of the magnetic field and keeping the material ratio constant. The ME coupling coefficient of a trilayered structure is larger than that of a bilayered structure with the same material ratio, and the maximum ME coupling coefficient of a trilayered structure increases nonlinearly with the increase in the interface area. At the resonant frequency, the structure's ME coupling performance is considerably improved. An optimization technique based on structural geometric design and magnetic field control is presented to optimize the ME coupling coefficient.