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Magnetoelectric interactions in layered composites of piezoelectric quartz and magnetostrictive alloys

机译:压电石英和磁致伸缩合金层状复合材料中的磁电相互作用

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摘要

Mechanical strain mediated magnetoelectric effects are studied in bilayers and trilayers of piezoelectric quartz and magnetostrictive permendur (P), an alloy of Fe-Co-V. It is shown that the magnetoelectric voltage coefficient (MEVC), proportional to the ratio of the piezoelectric coupling coefficient to the permittivity, is higher in quartz-based composites than for traditional ferroelectrics-based ME composites. In bilayers of X-cut single crystal quartz and permendur, the MEVC varies from 1.5 V/cm Oe at 20 Hz to ~185 V/cm Oe at bending resonance or electromechanical resonance corresponding to longitudinal acoustic modes. In symmetric X-cut quartz-P trilayers, the MEVC ~4.8 V/cm Oe at 20 Hz and ~175 V/cm Oe at longitudinal acoustic resonance. Trilayers of Y-cut quartz and permendur show ME coupling under a shear strain with an MEVC that is an order of magnitude smaller than for longitudinal strain in samples with X-cut quartz. A model for low-frequency and resonance ME effects which allows for explicit expressions of MEVC and resonance frequencies is provided and calculated. MEVCs are in general agreement with measured values. Magnetoelectric composites with quartz have the desired characteristics such as the absence of ferroelectric hysteresis and pyroelectric losses and could potentially replace ferroelectrics in composite-based magnetic sensors, transducers, and high-frequency devices.
机译:在压电石英和Fe-Co-V合金的磁致伸缩膜(P)的双层和三层中研究了机械应变介导的磁电效应。结果表明,与传统的铁电基ME复合材料相比,石英基复合材料的磁电电压系数(MEVC)与压电耦合系数与介电常数之比成正比。在X切单晶石英和permendur的双层中,MEVC在对应于纵向声模的弯曲共振或机电共振下,在20 Hz时从1.5 V / cm Oe变到185 V / cm Oe。在对称的X切石英P三层中,MEVC在20 Hz时约为4.8 V / cm Oe,在纵向声共振时约为175 V / cm Oe。 Y形切割石英和permendur的三层结构显示,在剪切应变下,MEVC的ME耦合比在X形切割石英的样品中的纵向应变小一个数量级。提供并计算了低频和共振ME效应模型,该模型允许MEVC和共振频率的明确表达。 MEVC通常与测量值一致。具有石英的磁电复合材料具有所需的特性,例如不存在铁电磁滞和热电损耗,并有可能替代基于复合材料的磁传感器,换能器和高频设备中的铁电体。

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