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基于磁致伸缩相与压电相的本构方程,应用弹性力学模型,简要介绍了如何推导自由状态的磁电双层膜纵向、横向磁电(ME)电压系数.并采用相应的材料参数计算了La0.7Sr0.3MnO3-Pb(Zr,Ti)O3(LSMO-PZT),Tb1-xDyxFe2-y(TDF)-PZT双层膜中的磁电电压系数,具体分析了其与压电相的体积分数v、界面耦合参数k以及偏置磁场H之间的关系.分析结果表明,在某一体积分数vm下,ME电压系数达到最大值,且最大值与k成近似线性关系.由于TDF的超大磁致伸缩效应,TDF-PZT双层膜的横向ME电压系数可达1.9Vcm-1Oe-1,而LSMO-PZT的仅为165mVcm-1Oe-1(1Oe=80A/m).将LSMO-PZT中横向ME电压系数随偏置磁场H变化的理论值与实验结果进行对照,其界面耦合参数k为0.2.研究结果表明:优异的磁致伸缩性能、合适的体积分数、良好的界面耦合是影响ME效应的关键因素.
Based on the constitutive equations of magnetostrictive phase and piezoelectric phase, the elastic-mechanical model is introduced briefly to describe how to deduce the longitudinal and transverse magnetoelectric (ME) voltage coefficients of the free-state magnetoelectric bilayer membrane. The corresponding material parameters The magnetoelectric voltage coefficients in La0.7Sr0.3MnO3-Pb (Zr, Ti) O3 (LSMO-PZT) and Tb1-xDyxFe2-y (TDF) -PZT bilayers were analyzed in detail. Fraction v, interface coupling parameter k and bias magnetic field H. The analysis results show that the ME voltage coefficient reaches a maximum at a certain volume fraction vm, and the maximum value is approximately linear with k. Due to the large TDF Magnetostrictive effect, TDF-PZT bilayer membrane horizontal ME voltage coefficient up to 1.9Vcm-1Oe-1, and LSMO-PZT only 165mVcm-1Oe-1 (1Oe = 80A / m). LSMO-PZT The theoretical value of the transverse ME voltage coefficient with the bias magnetic field H is compared with the experimental results, and the interface coupling parameter k is 0.2. The results show that excellent magnetostrictive performance, proper volume fraction and good interfacial coupling affect the ME The key factor of effect.