Abstract The current research is devoted to studying the propagation behavior of Love waves in a functionally graded piezoelectric film perfectly bound to a homogeneous piezomagnetic substrate named FGPPM. All the material properties are supposed to be exponential through the piezoelectric film. Using the stiffness matrix method (SMM), the phase and group velocities are numerically calculated for magneto-electrically open and shorted cases. A detailed investigation of the gradient coefficient effect on the dispersion curve, the magneto-electromechanical coupling factor, the cutoff wave-number, and the modal shape is undertaken. It is found that quite a high magneto-electromechanical coupling factor for the structure at some appropriate wave number can be achieved by a simple adjustment of the gradient coefficient. As the variation of magneto-electromechanical properties of the film changes gradually with depth, and since the initial stress is supposed negligible during the manufacturing process, this calculation model could serve as a perfect match for the laminated piezoelectric-piezomagnetic structures used as surface acoustic wave devices (SAW). Thus, it can provide a theoretical basis for the design of the SAW devices with high performance.

中文翻译：

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超声波洛夫波在具有指数变化的功能梯度压电-压电材料中的传播行为

摘要 目前的研究致力于研究洛夫波在功能梯度压电薄膜中的传播行为，该薄膜完美绑定到名为 FGPPM 的均匀压电基底上。所有材料特性都应该通过压电薄膜呈指数增长。使用刚度矩阵方法 (SMM)，可以对磁电开路和短路情况下的相速度和群速度进行数值计算。详细研究了梯度系数对色散曲线、磁机电耦合因子、截止波数和模态形状的影响。结果表明，通过简单地调整梯度系数，可以在一些适当的波数下实现结构的相当高的磁机电耦合因子。由于薄膜的磁机电性能随深度的变化而逐渐变化，并且由于在制造过程中初始应力假设可以忽略不计，因此该计算模型可以完美匹配用作表面声波的层压压电 - 压电结构设备 (SAW)。从而为高性能声表面波器件的设计提供理论依据。