磁电复合材料PMN-PT/Terfenol-D/PMN-PT磁电耦合性能的有限元分析  

Finite element analysis of magnetoelectric efficiency of magnetoelectric laminates PMN-PT/Terfenol-D/PMN-PT

作　　者：丁本杰 陈剑斌 黄斌[1] 杜建科[1] DING Benjie;CHEN Jianbin;HUANG Bin;DU Jianke(School of Mechanical Engineering and Mechanics,Ningbo University,Ningbo 315211,China)

机构地区：[1]宁波大学机械工程与力学学院,浙江宁波315211

出　　处：《功能材料》2018年第10期80-84,93,共6页Journal of Functional Materials

摘　　要：由铁电相和铁磁相组成的磁电复合材料被证明有非常显著的磁电耦合效应,近年来受到越来越多的关注。利用有限元PDE的方法对磁电复合材料PMN-PT/Terfenol-D/PMN-PT的磁电耦合性能进行了分析,主要研究了边界条件、结构尺寸对磁电耦合性能的影响。研究发现,当上下表面y方向固定,其它表面自由时,磁电复合材料长度方向伸缩更加明显,具有更大的磁电耦合系数;铁电相和铁磁相厚度比与磁电耦合系数程非线性关系,当铁电相厚度为1.1mm,铁磁相厚度为1.9mm时,磁电耦合系数具有最大值3.354((V/m)/A/m));当铁电层尺寸保持不变,铁磁层长度超过10mm后,铁磁层长度对磁电耦合系数影响不明显。该理论结果可以用于提高磁电耦合性能同时达到节省材料的目的。Magnetoelectric(ME)laminates consisting of ferroelectric and ferromagnetic phases have been proved to have very significant magnetoelectric coupling effects.The lack of single-phase magnetoelectric materials and their low performance at room temperature make the ME composites become the ideal materials to prepare the new generation electronic devices.Piezoelectric/magnetostrictive composite materials have extensive and important applications in fields such as magnetic field sensors,magnetoelectric transducers,microwave devices,resonators,etc.Due to their excellent force/electricity transfer function and rapid response characteristics,the key to obtaining a larger magnetoelectric coupling coefficient lies in the selection of suitable materials and device structures.They have attracted more and more attention in recent years.Finite element method was used to study the magnetoelectric coupling efficiency of layered magnetoelectric composites PMN-PT/Terfenol-D/PMN-PT in various conditions.In the research,the effects of boundary conditions and size on magnetoelectric coupling performance were mainly studied.The researches show that when the upper and lower surfaces is fixed to the Y direction and the other surfaces are free,the length direction of the magnetoelectric composites is more obvious and the magnetoelectric coupling coefficient is larger.The ferroelectric phase and ferromagnetic phase and magnetoelectric coupling efficiency show the non-linear relationship.The magnetoelectric coupling efficiency reaches the maximum valueof 3.354(V/m)/(A/m),when the ferroelectric phase thickness is 1.1 mm and the ferromagnetic phase thickness is 1.9 mm.The results show that the length of ferromagnetic layer only has marginal effects on the magnetoelectric coupling efficiency after the length of the ferromagnetic layer reaches 10 mm.These results can be used to enhance the magnetoelectric coupling efficiency and save materials.

关 键 词：磁电 复合材料 磁电耦合系数 有限元 铁电 铁磁 

分 类 号：TB331[一般工业技术—材料科学与工程]