【作者】 张星；

【导师】 李园园；

【作者基本信息】 华中科技大学 ， 微电子学与固体电子学， 2015， 硕士

【摘要】 为了更有效地使用频段,提高数据传输速率,可调滤波器已经广泛地运用到各种各样的信号处理系统和雷达系统。基于GGG/YIG/epoxy/电极/PZT/电极多层薄膜结构的磁电可调滤波器我们引入具有巨磁致伸缩效应的Terfenol-D,提出了新型高转换效率的电场磁场可调滤波器结构YIG/Terfenol-D/PZT/电极。YIG/Terfenol-D/PZT三层薄膜是实现滤波器工作频率电场磁场可调节的核心结构,本文对YIG/Terfenol-D/PZT三层薄膜间的耦合作用进行了理论和仿真研究。主要研究工作如下:1、利用等效电路法对Terfenol-D/PZT双层薄膜的DME和逆磁电效应进行研究;在本文中拟取材料参数条件下发现正磁电耦合系数和逆磁电耦合系数都在PZT层的体积分数n约0.4时达到最大值,都随PZT层的横向压电系数d31P和Terfenol-D层的纵向压磁系数d33m的增大而增大,Terfenol-D层饱和磁化时外加电场E的作用可以使Terfenol-D层薄膜的饱和磁化强度方向发生转动。2、利用最小能量原理确定了YIG/Terfenol-D双层薄膜系统平衡时磁化强度之间的相互作用关系,即外加磁场在0-3000 Oe范围内,YIG薄膜层的饱和磁化强度矢量M1方向始终与Terfenol-D薄膜层的饱和磁化强度矢量M2保持平行,可以通过改变Terfenol-D薄膜中饱和磁化强度方向,进而改变YIG薄膜中的磁化强度方向。3、对YIG/Terfenol-D/PZT三层薄膜之间的耦合作用进行了研究,发现外加电场E对YIG薄膜层的饱和磁化强度矢量M1进行微调,外加磁场H对YIG薄膜层的饱和磁化强度矢量M1进行粗调。4、采用MATLAB对Terfenol-D/PZT双层薄膜间磁电效应、YIG/Terfenol-D双层薄膜间的磁交换耦合作用以及YIG/Terfenol-D/PZT三层薄膜间的相互作用进行数值仿真,将得到的数值仿真结果与已报道的相关实验研究结果进行对比,验证了计算的正确性,并优化实验参数,为后期的实验工作作指导。更多还原

【Abstract】 In order to make more effective use of frequency spectrum and improve the data transmission rate, tunable filters have been widely and continuously playing an important role to meet demands in both modern various commercial signal processing systems and military radar systems. Based on GGG/YIG/epoxy/electrode/PZT/electrode multilayer film structure, magnetostrictive phase rare-earth-iron alloy(Terfenol-D), which can not only exhibit giant magnetostrictive effect but be used as electrode of PZT, was introduced to substitute the epoxy/electrode, and a higher conversion efficiency multiferroic GGG/YIG/Terfenol-D/PZT/electrode trilayer films structure was proposed. In this structure, the core component YIG/Terfenol-D/PZT can make electric field to control the working frequency of filter. The interactions between YIG/Terfenol-D/PZT trilayer films have been exactly investigated by theory and simulation in this paper, and the main contents are as follows.1. An equivalent circuit approach was used to analyze the DME and IME of Terfenol-D/PZT bilayer films. The results revealed that the magnetoelectric voltage coefficient and inverse magnetoelectric coefficient reached the maximum when the volume fraction of PZT is about 0.4, and increased with the increase of d31 P of PZT layer and d33 m of Terfenol-D layer. When Terfenol-D was saturation magnetized, we found that the saturation magnetization orientation of Terfenol-D layer can be tuned by electric field E on PZT.2. The physical model of YIG/Terfenol-D bilayer films was presented, and the magnetic exchange-coupled interaction of Terfenol-D/YIG bilayer was investigated by the principle of minimum energy. The magnetic exchange-coupled relationship between saturation magnetization M1 of YIG and saturation magnetization M2 of Terfenol-D was obtained. The results revealed that when the magnetic field ranges from 0 Oe to 3000 Oe in the scope of actual application, the direction of saturation magnetization M1 of YIG will keep parallel with the direction of saturation magnetization M2 of Terfenol-D, so that the external magnetic field can adjust the direction of saturation magnetization M1 of YIG by adjusting the direction of saturation magnetization M2 of Terfenol-D.3. The coupling interactions between YIG/Terfenol-D/PZT trilayer were investigated based on magnetoelectric interactions of Terfenol-D/PZT bilayer and magnetic exchange-coupled interaction of Terfenol-D/YIG bilayer. The results of calculation and simulation demonstrated that the external magnetic field can tune the direction of saturation magnetization M1 of YIG in a large range, while the electric field on PZT can tune the direction of saturation magnetization M1 of YIG in a relatively small range.4. MATLAB was used to simulate the magnetoelectric effect of Terfenol-D/PZT bilayer films, the magnetic exchange coupling interaction of YIG/Terfenol-D bilayer films and coupling interactions between YIG/Terfenol-D/PZT trilayer films. The comparison of our numerical simulations and previous researches confirmed the correctness of our calculations and simulations. Some optimal experimental parameters were obtained to guide the future experimental work and further research.更多还原