Nonlinear magneto-electric effects in ferromagnetic-piezoelectric composites
Nonlinear magneto-electric effects in ferromagnetic-piezoelectric composites
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DOI：
10.1016/j.jmmm.2014.01.062
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发表时间：
2014-05-01
影响因子：
2.7
通讯作者：
Srinivasan, G.
中科院分区：
文献类型：
--
作者：
Burdin, D. A.;Chashin, D. V.;Srinivasan, G.
系统地研究了层状铁磁和铁电复合材料中非线性磁电相互作用的性质。该模型考虑了与铁磁体的磁致伸缩相关的非线性，当复合材料受到交流磁场时，将导致（i）直流分量和（ii）倍频。在两个不同频率的交流磁场的存在下，非线性效应引起在场频率的和和差处产生ME电压。的非线性ME相互作用的效率示出为相对于偏置磁场的磁致伸缩的二阶导数的函数。该模型的预测与锆钛酸铅（PZT）和铁磁层的双层的数据进行了比较，饱和磁致伸缩和饱和磁场，即，非晶铁磁（AF）合金、Ni或坡明杜尔合金。在线性激励条件下，当在声学模式频率下施加交流磁场时，测量ME电压的增强。在非线性激励条件下，机械变形和ME响应发生在两倍的激励频率和AF PZT复合材料显示出更高的非线性ME效应。此外，AF-PZT显示出一个有效的频率混合比样品与镍或permendur时，受到两个交流磁场。的频率混合被证明是磁场传感器应用的重要性。(C)2014由Elsevier B. V.出版
Theory and results of a systematic study on the nature of nonlinear magnetoelectric (ME) interactions in layered ferromagnetic and ferroelectric composites are discussed. The model that considers the nonlinearity associated with magnetostriction of the ferromagnet is to result in (i) a dc component and (ii) frequency doubling when the composite is subjected to an ac magnetic field. In the presence of two ac magnetic fields of different frequencies, nonlinear effects give rise to generation of ME voltages at the sum and difference of the fields frequencies. The efficiencies of nonlinear ME interactions are shown to be a function of the second derivative of the magnetostriction with respect to the bias magnetic field. The predictions of the model are compared with data for bilayers of lead zirconate titanate (PZT) and ferromagnetic layers with wide variations in saturation magnetostrictions and saturation magnetic fields, i.e., an amorphous ferromagnetic (AF) alloy, Ni, or permendur. Under linear excitation conditions an enhancement in the ME voltage is measured when the ac magnetic field is applied at the acoustic mode frequencies. Under nonlinear excitation conditions the mechanical deformation and the ME response occur at twice the excitation frequency and the AF-PZT composite shows a much higher nonlinear ME effects. In addition, the AF-PZT shows an efficient frequency mixing than the samples with Ni or permendur when subjected to two ac magnetic fields. The frequency mixing is shown to be of importance for magnetic field sensor applications. (C) 2014 Published by Elsevier B.V.