Thickness effects on magnetoelectric coupling for Metglas/PZT/Metglas laminates

Thickness effects on magnetoelectric coupling for Metglas/PZT/Metglas laminates
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厚度对 Metglas/PZT/Metglas 层压板磁电耦合的影响

DOI:
10.1007/s11433-011-4268-2
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发表时间:
2011-02
期刊:
Science China: Physics, Mechanics and Astronomy
影响因子:
--
通讯作者:
Yang, Wei
Yang, Wei
中科院分区:
其他
文献类型:
--
作者:
Fang, Fei;Zhao, ChangPeng;Yang, Wei

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研究了金属陶瓷/PZT/金属陶瓷三层层合板的厚度对机电系数α ME和机电谐振频率的影响。磁性板的厚度通过组装不同数量的金属薄片(每层30 μm)而改变,而PZT板保持恒定厚度(0.5 mm)。在1 kHz的交变磁场下,电磁场系数(αME)与静磁场(HS)的关系曲线上只有一个峰值。随着厚度比的增加,μ ME的峰值先增加,在lyn = 0.519左右达到最大值,然后下降。随着n的增加,峰值位置(Hoptim)稳定地向更高的值移动。结果表明,随着n的增大,磁相弛豫因子k减小,压磁系数d_(11)减小,Hoptim增大。采用细观力学模型,考虑d_(11),m随n的退化,预测了最佳厚度比为0.5,与实验结果一致。层合板的共振频率随着n的增加而增加,这与使用简单的混合定律的计算一致。
Thickness effects on the ME coefficient αMEand electromechanical resonance frequency of Metglas/PZT/Metglas tri-layered laminates are investigated. The thickness of the magnetic plate is changed by assembling different numbers of the Metglas thin sheets (30 μm for each layer) while the PZT plate is maintained at constant thickness (0.5 mm). At 1 kHz of the applied alternating magnetic field, only one peak presents in the ME coefficient (αME) versus static magnetic field (HS) curve. As the thickness rationincreases, the peak value of μMEfirst increases and reaches a maximum at approximatelyn= 0.519, and then decreases afterward. The peak position (Hoptim) moves steadily toward a higher value asnincreases. It is suggested that the relaxation factorkof the magnetic phase is reduced asnincreases, causing the decrease of the piezomagnetic coefficientd11,mand the increase ofHoptim. By employing the micromechanics model and considering the degradation ofd11,mwithn, an optimized thickness ratio of 0.5 is predicted, which is in agreement with the experimental observations. The resonance frequency of the laminate increases withn, which is consistent with the calculation using a straightforward mixture law.
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