磁铁/压电双晶片复合材料磁电耦合性能的优化设计  

Optimization design for magnetoelectric coupling property of the magnet/bimorph composite

作　　者：张源[1,2] 高雁军[1] 胡诚[1] 谭兴毅[1] 邱达[1] 张婷婷[1] 朱永丹[1,2] 李美亚[2] 

机构地区：[1]湖北民族学院理学院,恩施445000 [2]武汉大学物理科学与技术学院,武汉430072

出　　处：《物理学报》2016年第16期211-216,共6页Acta Physica Sinica

基　　金：国家自然科学基金重点项目(批准号:51132001);国家自然科学基金(批准号:11504101;11364018;51372174;J1210061);湖北省自然科学基金(批准号:2014CFB610);湖北省青年创新团队基金(批准号:T201429)资助的课题~~

摘　　要：本文采用弹性力学的方法,基于压电方程,给出了磁铁/压电双晶片(Bimorph)复合材料磁电耦合系数的理论表达式,并选取不同的结构参数和材料参数对其磁电耦合系数进行了数值计算.研究表明:Bimorph存在最佳的压电层厚度,使得磁铁/Bimorph复合材料的磁电耦合系数达到最大;金属层材料和压电相材料也均会影响磁铁/Bimorph复合材料的磁电耦合系数.该研究结果为磁铁/Bimorph复合材料的优化设计、实际应用提供了有益的理论指导.Magnetoelectric （ME） composite as one kind of ME material that can yield a strong coupling effect between magnetic and electric fields at room temperature, has drawn widespread attention for decades due to its rich physics contents and significant technological prospect. Except for traditional magnetostrictive/piezoelectric based ME composites, other ME composites have been reported, among which the magnet/piezo-cantilever composites show super strong ME coupling effect. The magnet/piezo-cantilever composite is generally composed of a piezoelectric cantilever and magnets attached at the free end of the cantilever, which realizes ME coupling by force moment-mediated magnetic torque effect and piezoelectric effect. Recently, various configurations of the magnet/piezo-cantilever composites for obtaining higher ME coupling coefficients have been proposed and demonstrated experimentally. However, few theoretical researches of these magnet/piezo-cantilever composites of different configurations have been carried out, which is of great importance for optimizing the design of ME coupling property of the magnet/piezo-cantilever composites. Here in this paper, a theoretical expression for the low-frequency ME coupling coefficient in the magnet/piezo-cantilever composite is deduced based on piezoelectric constitutive equations by using the theory of elastic mechanics. The typical magnet/bimorph composite is chosen as the theoretical model. Based on the deduced theoretical expression, the dependences of the low-frequency ME coupling coefficients in the magnet/bimorph composite on material and structural parameters are numerically calculated. The results show that there are optimal thickness values of the piezoelectric layers in the magnet/bimorph composite with different metal thickness values and material constituents for achieving maximal low-frequency ME coupling coefficients. The thicker the metal layer in the magnet/bimorph composite, the less insensitive the low-frequency ME coupling coefficient to the thickness of

关 键 词：磁电耦合效应 复合材料 压电双晶片 磁铁 

分 类 号：TB33[一般工业技术—材料科学与工程]