共查询到19条相似文献,搜索用时 94 毫秒
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采用化学镀和黏接法制备层状磁电复合材料Ni/PZT/TbFe2,研究其磁电性能及谐振频率随Ni层厚度的变化情况. 结果表明:Ni/PZT/TbFe2层状磁电复合材料与其他结构的磁电性能不同,其一阶弯曲谐振峰值和纵向谐振峰值都很大. 随着Ni层厚度的增加,Ni/PZT/TbFe2层状磁电复合材料的一阶纵向谐振峰值逐渐增大. 结合实验数据和理论计算值得出了材料的一阶弯曲谐振频率fr1和一阶纵向谐振频率f
关键词:
磁电效应
正磁致伸缩
负磁致伸缩
谐振频率 相似文献
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利用阶梯形变幅杆的应变放大作用,构造了磁致伸缩/阶梯形弹性基底/压电复合结构. 采用等效电路法分析了沿长度方向振动复合结构的一阶磁电响应. 计算了Terfenol-D/阶梯形铍青铜基底/PZT-5H复合结构的磁电响应,并与实际结构的磁电响应进行了比较,由于理论分析中忽略了胶层产生的损耗,理论值和实验结果的变化规律相似,但是谐振频率点和磁电电压转换系数有一定的差异. 同时比较了阶梯形基底和等截面杆基底复合结构,分析表明前者具有更高的磁电电压转换系数. 研究了阶梯形弹性基底长度比及层厚比对复合结构纵振动一阶模
关键词:
磁电效应
磁致伸缩/压电复合结构
磁电响应 相似文献
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对三明治复合结构TbxDy1-xFe2-y/Pb(Zr, Ti)O3/TbxDy1-xFe2-y的电容与频率及磁场的函数关系进行了实验和理论研究. 实验发现,该复合材料样品的电容随频率的增加而出现多个谐振峰,并且其谐振点随磁场的增加而发生频移. 在谐振点附近,观察到样品的阻抗随磁场的增加由容抗性转变为感抗性,从而同时观察到巨大的正磁电容效应和负磁电容效应. 由复合材料的弹性力学本构方程出发,对该类样品的电容随频率及磁场的变化进行了理论模拟. 结果显示,模拟曲线与实验结果符合得很好. 理论表明该磁致伸缩/压电复合材料的磁电容效应源于磁场诱变的铁磁相柔顺系数.
关键词:
层状复合材料
界面弹性耦合
磁电容效应 相似文献
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多铁体(multiferroic)和磁电体(magnetoelectric material)最近几年已迅速成为物理界和材料界的研究热点,其潜在的应用价值必将随着未来的深入研究而得到进一步展现。围绕磁电效应这一多铁体和磁电体最重要的特性,本文介绍了近期理论和实验研究的多方面进展,其中重点评述了有关磁电效应产生机制,特别是一些新颖机制如界面磁电效应,表面磁电效应,电子型多铁性,螺旋自旋(spiral spin)铁电性,铁涡性(ferrotoroidic)和一些广义磁电效应如拓扑磁电效应等的相关研究。文章最后介绍了基于多铁体和磁电体的一些新型功能性器件,如四态存储器,多铁性内存,磁读电写硬盘等。 相似文献
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Electric polarization is predicted to occur under the conditions of parametric instability of vibrations of magnetization in a longitudinal high-frequency magnetic field (parametric magnetoelectric effect). The requirements on materials are indicated favoring the observation of this effect. An example of such materials is the easy-plane antiferromagnet Cr2TeO6. 相似文献
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A systematic study of magnetoelectric composite system (x) CoFe2O4+(1−x) Pb(Mg1/3Nb2/3)0.67Ti0.33O3 with x=0, 0.15, 0.30, 0.45 and 1 was carried out. The lattice strain was calculated using Williamson and Hall equation, which depends on the content of constituent phases in composites. The microstructure was studied using scanning electron microscopy. The ferroelectric transition temperature was independent of the content of individual phases, suggesting that the ferroelectric character is maintained in the composite. Observed P–E and M–H loops indicate that the multiferroic nature of magnetoelectric ceramics is dependent on the content of individual phases. The variation of magnetostriction with dc magnetic field was studied. The maximum magnetoelectric voltage coefficient of 7.2 mV/cm Oe is obtained for the synthesized composites. The magnetoelectric measurements are well explained with magnetostrictive behavior of the magnetic phase. 相似文献
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We report the observation of fairly large and fully recoverable shape-memory strain in thin bars of lead magnesium niobate lead titanate ceramic for a composition (65/35) near its morphotropic phase-boundary. The recoverable shape strain produced by bending and thermal-cycling experiments is ∼0.3%, similar in magnitude to that reported for the shape-memory effect (SME) observed in some other dielectric ceramics. An explanation of the observed SME and the recoverable shape-strain is given in terms of the ferroelastic phase transitions, and the availability of a large number of competing phases and domain states near the morphotropic phase boundary in this material. The stress-induced shifting of the temperatures at which the ferroelastic phase transitions occur also plays an important role in ensuring good crystallographic reversibility around the thermal-cycling experiments. 相似文献
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采用粘合法制备了叠层结构的块体Terfenol-D/PZT磁电复合材料,测量了不同频率下的磁电回线,采用新的极坐标下的方式做图.从极坐标下的磁电回线中可以看出,随直流磁场的变化,非谐振频率下的磁电相位发生了轻微移动,移动幅度随频率的增加而增加;而在谐振频率下,伴随着巨磁电效应,磁电相位发生了显著移动,移动幅度达到了近90°.与粉末Terfenol-D/环氧树脂/PZT磁电复合材料对比之后表明,非谐振频率下块体Terfenol-D/PZT的磁电相位移动主要由涡流引起;而谐振频率下大幅度相位移动则主要来源于Terfenol-D的磁致弹性变化. 相似文献
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D. A. Filippov 《Physics of the Solid State》2005,47(6):1118-1121
A theory of the magnetoelectric effect in ferromagnetic-piezoelectric bilayer structures is considered for platelike samples. The magnetoelectric voltage coefficient is expressed through the parameters characterizing the magnetic and piezoelectric phases. It is shown that the magnetoelectric voltage coefficient considerably increases in the region of electromechanical resonance. The thickness ratio between the ferromagnetic and piezoelectric phases at which the magnetoelectric voltage coefficient is maximum is determined. The calculated magnetoelectric voltage coefficients for Permendur-PZT (lead zirconate titanate) structures are presented and compared with the experimental data. 相似文献
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B. K. Ponomarev A. I. Popov E. Steep H. Wiegelmann A. G. M. Jansen P. Wyder B. S. Red’kin 《Physics of the Solid State》2005,47(7):1326-1330
Anisotropy of the nonlinear magnetoelectric effect in a single-crystal, single-domain sample of the β′ metastable ferroelectric paramagnetic phase of terbium molybdate Tb2(MoO4)3 was studied experimentally in dc magnetic fields of up to 6 T at temperatures of 4.2 and 1.8 K. It was shown that the existing models of the magnetoelectric effect cannot explain the experimental dependences of magnetic field-induced electric polarization on the direction of the applied magnetic field. A model of the magnetoelectric effect is proposed that qualitatively describes the observed angular dependence of the magnetic field-induced electric polarization. 相似文献
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Yaojin Wang Davresh Hasanyan Menghui Li Junqi Gao Ravindranath Viswan Jiefang Li D. Viehland 《固体物理学:研究快报》2012,6(6):265-267
The tunability of magnetoelectric (ME) properties by applied dc electric field (E) was systematically investigated for a laminate composite consisting of Metglas, Pb(Zrx Ti1–x)O3 fiber, and interdigitated electrodes. The ME coefficients and equivalent magnetic noise were found to be dependent on E. This dependence is attributed to variations in the magnetic properties. The dielectric properties and noise charge density were relatively invariant to E. A 1.3× improvement in the ME coefficient was obtained at the Villari point under E = 300 V/mm relative to E = 0 V/mm. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献