Magnetoelectric effect in composites of magnetostrictive and piezoelectric materials
Magnetoelectric effect in composites of magnetostrictive and piezoelectric materials
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DOI：
10.1023/a:1020599728432
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发表时间：
2002-08-01
影响因子：
1.7
通讯作者：
Kim, HE
中科院分区：
文献类型：
--
作者：
Ryu, J;Priya, S;Kim, HE
在过去的几十年中，人们对单相和复合材料中的磁电（ME）效应进行了广泛的研究。材料在磁场下的电极化或在电场下的感应磁化需要同时存在磁矩和电偶极子的长程有序。单相材料存在一个缺点，即即使在低温下，磁电效应也相当微弱，这限制了它们在实际器件中的应用。更好的替代材料是具有较大磁电电压系数的磁电复合材料。这些复合材料利用了材料的乘积特性。可以使用由单独的压磁相和压电相或单独的磁致伸缩相和压电相组成的复合材料来实现磁电效应。在过去几年中，我们的团队对用于磁场传感应用的磁电材料以及用于大功率电力传输系统的电流测量探头进行了广泛的研究。在这篇综述文章中，我们主要强调我们对磁电颗粒复合材料和层状复合材料的研究，并总结重要结果。为了清晰起见，还对文献中报道的数据进行了比较。基于这些结果，我们确定了一个事实，即由巨磁致伸缩材料Terfenol - D和弛豫基压电晶体制成的磁电层状复合材料（MLCs）远远优于其他材料。MLCs中较大的磁电电压系数是由于压电晶体的高压电电压系数和较大的弹性柔量而获得的。此外，压电相和磁致伸缩相之间的优化厚度比以及磁致伸缩的方向也会影响磁电系数的大小。
In the past few decades, extensive research has been conducted on the magnetoelectric (ME) effect in single phase and composite materials. Dielectric polarization of a material under a magnetic field or an induced magnetization under an electric field requires the simultaneous presence of long-range ordering of magnetic moments and electric dipoles. Single phase materials suffer from the drawback that the ME effect is considerably weak even at low temperatures, limiting their applicability in practical devices. Better alternatives are ME composites that have large magnitudes of the ME voltage coefficient. The composites exploit the product property of the materials. The ME effect can be realized using composites consisting of individual piezomagnetic and piezoelectric phases or individual magnetostrictive and piezoelectric phases. In the past few years, our group has done extensive research on ME materials for magnetic field sensing applications and current measurement probes for high-power electric transmission systems. In this review article, we mainly emphasize our investigations of ME particulate composites and laminate composites and summarize the important results. The data reported in the literature are also compared for clarity. Based on these results, we establish the fact that magnetoelectric laminate composites (MLCs) made from the giant magnetostrictive material, Terfenol-D, and relaxor-based piezocrystals are far superior to the other contenders. The large ME voltage coefficient in MLCs was obtained because of the high piezoelectric voltage coefficient of the piezocrystals and large elastic compliances. In addition, an optimized thickness ratio between the piezoelectric and magnetostrictive phases and the direction of the magnetostriction also influence the magnitude of the ME coefficient.