Colossal low-frequency resonant magnetomechanical and magnetoelectric effects in a three-phase ferromagnetic/elastic/piezoelectric composite
Colossal low-frequency resonant magnetomechanical and magnetoelectric effects in a three-phase ferromagnetic/elastic/piezoelectric composite
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DOI：
10.1063/1.4756919
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发表时间：
2012-10
影响因子：
4
通讯作者：
G. Liu;Xiaotian Li;Jianguo Chen;Huaduo Shi;Wenlei Xiao;S. Dong
中科院分区：
文献类型：
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作者：
G. Liu;Xiaotian Li;Jianguo Chen;Huaduo Shi;Wenlei Xiao;S. Dong
在由Pb(Zr，Ti)O_3陶瓷纤维/荧光粉铜片单晶片和NdFeB磁体制成的三相复合材料中，发现了巨大的低频共振磁机械(MM)和磁电(ME)耦合效应。实验结果表明，具有悬臂梁结构的铁磁/弹性/压电三相复合材料在∼5 Hz的一阶弯曲共振频率下，弯曲MM系数可达145.9×10−3/Oe(单位为弯曲弧度)，ME电压系数可达∼16000V/cm·Oe。所取得的与ME效应相关的结果至少比已报道的其他ME材料和器件高一个数量级。三相复合材料中极强的MM和ME耦合是由于NdFeB磁体与外加磁场的相互作用产生了强烈的磁力矩效应，并通过具有较高机械品质因数的应变介导的荧光粉铜片而进一步增强了共振。
Colossal low-frequency resonant magnetomechanical (MM) and magnetoelectric (ME) coupling effects have been found in a three-phase composite made of Pb(Zr,Ti)O3 ceramic fibers/phosphor copper-sheet unimorph and NdFeB magnets. The experimental results revealed that the ferromagnetic/elastic/piezoelectric three-phase composite with a cantilever beam structure could show huge bending MM coefficient of ∼145.9 × 10−3/Oe (unit in bending radian per Oe) and ME voltage coefficient of ∼16 000 V/cm·Oe at the first-order bending resonance frequency of ∼5 Hz. The achieved results related to ME effect are at least one order of magnitude higher over those of other ME materials and devices reported ever. The extremely strong MM and ME couplings in the three-phase composite are due to strong magnetic force moment effect induced by the interaction between NdFeB magnets and the applied magnetic field, and further resonant enhancement via the strain-mediated phosphor copper-sheet with a relatively high mechanical quality factor.