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R.K. Zheng S.H. ChoyY. Wang H.L.W. ChanC.L. Choy H.S. Luo 《Journal of Alloys and Compounds》2011,509(14):4878-4881
We fabricated a magnetoelectric laminate structure consisting of a magnetostrictive Tb0.3Dy0.7Fe1.92 (Terfenol-D) plate bonded to a La0.7Ca0.15Sr0.15MnO3 (LCSMO)/0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3 (PMN-PT) structure where a LCSMO film was epitaxially grown on a PMN-PT single crystal substrate. When a dc magnetic field is applied perpendicular to the film plane, the magnetoresistance of the LCSMO film in the paramagnetic (ferromagnetic) state for the LCSMO/PMN-PT/Terfenol-D structure is larger (smaller) than that for the LCSMO/PMN-PT structure without Terfenol-D. These effects are caused by the magnetostriction-induced in-plane compressive strain in the Terfenol-D, which are transferred to the PMN-PT substrate, leading to a reduction in the in-plane tensile strain of the epitaxial LCSMO film and thereby modifying the magnetoresistance of the film. 相似文献
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稀土超磁致伸缩材料及其高效应用方法 总被引:14,自引:0,他引:14
近年来,由于稀土超磁致伸缩材料具有卓越的特性,在高新技术领域引起了广泛的重视。重点介绍了稀土超磁致伸缩材料的发展简史、特点及高效应用方法。 相似文献
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超磁致伸缩材料Terfenol-D是一种新型的功能材料,以Terfenol-D为核心元件设计各种换能器时,磁场H和应力σ是必须考虑的因素.研究了一定偏置磁场下外加压应力对Terfenol-D棒的应变和磁感应强度的影响.首先测试了在一定的偏置磁场下外压应力和应变的关系,结果表明偏置磁场一定时,应变和应力之间的关系复杂,可用磁性材料技术磁化理论来解释.其次又测试了一定偏置磁场下的外加动态应力和磁感应强度的关系,测试结果表明一定的偏置磁场下,外加压应力增加,磁感应强度减小;偏置磁场为5kA/m时,磁感应强度达到最大值.该实验结果可以为基于Terfenol-D的换能器件的设计提供技术支持. 相似文献
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Won- Je Park Zin- Hyoung Lee Jong- Chul Kim Byung-Joon Ye Dae-Rak Son 《Metals and Materials International》1998,4(6):1171-1179
A rare earth-iron intermetallic compound Tb0.3Dy0.7Fe1.90, also called Terfenol-D, has a gigantic room temperature magnetostriction at a relatively small magnetic field. In this study
microsegregation of Tb and Dy in directionally solidified Terfenol-D was investigated. It was predicted from a calculated
phase diagram and experimentally verified that Tb concentration at the center of the cell which solidified earlier was lower
than that at the cell boundary. In order to homogenize this microsegregation, specimens were annealed at 1000°C for 40 hours,
and various magnetic properties were measured as a function of applied field under uniaxial compressive stress in the range
from 0.5 to 1.2 MPa. After the annealing, the maximum magnetostriction increased at a compressive stress below 9 MPa, magnetostrictive
coefficient d33 and magneto-elastic coupling coefficient k33 increased, but permeability decreased. These results may be due to the reduction of magnetocrystalline energy which was locally
very high before annealing due to microsegregation. 相似文献
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从磁场取向和铁磁体磁化出发,研究了粉末Tb0.27Dy0.73Fe2的最佳磁粉粒度.计算结果表明:Tb0.27Dy0.73Fe2磁粉颗粒的单畴临界直径为22nm,磁粉粒度小于22nm时整个颗粒为单畴结构;磁粉粒度大于22nm时,磁粉将过渡到多畴结构.所以理论上粉末Tb0.27Dy0.73Fe2的最佳磁粉粒度为纳米数量级.理论值与实验值的偏离,主要是因为细颗粒磁粉比粗颗粒磁粉更容易氧化且细颗粒的浸润性较差. 相似文献
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Heliang LiuAuthor VitaeSiu Wing OrAuthor Vitae Hwa Yaw TamAuthor Vitae 《Sensors and actuators. A, Physical》2012,173(1):122-126
We report a magnetostrictive composite-fiber Bragg grating (MC-FBG) magnetic field sensor based on the direct coupling of the magnetostrictive strain in an epoxy-bonded Terfenol-D particle pseudo-1-3 MC actuator with a FBG strain sensor. The MC-FBG sensor exhibits a large and fairly linear quasistatic peak wavelength shift of 0.68 nm under an applied magnetic field of 146 kA/m and a wide extrinsic magneto-optical signal frequency range up to at least 60 kHz. These quasistatic and dynamic characteristics, together with the electromagnetic interference immunity, large-scale multiplexing potential and self-reference capability, enable the application of the MC-FBG sensor in distributed magnetic field sensing over long distances. 相似文献
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Magnetoelectric Effect in Composites of Magnetostrictive and Piezoelectric Materials 总被引:9,自引:0,他引:9
In the past few decades, extensive research has been conducted on the magnetoelectric (ME) effect in single phase and composite materials. Dielectric polarization of a material under a magnetic field or an induced magnetization under an electric field requires the simultaneous presence of long-range ordering of magnetic moments and electric dipoles. Single phase materials suffer from the drawback that the ME effect is considerably weak even at low temperatures, limiting their applicability in practical devices. Better alternatives are ME composites that have large magnitudes of the ME voltage coefficient. The composites exploit the product property of the materials. The ME effect can be realized using composites consisting of individual piezomagnetic and piezoelectric phases or individual magnetostrictive and piezoelectric phases. In the past few years, our group has done extensive research on ME materials for magnetic field sensing applications and current measurement probes for high-power electric transmission systems. In this review article, we mainly emphasize our investigations of ME particulate composites and laminate composites and summarize the important results. The data reported in the literature are also compared for clarity. Based on these results, we establish the fact that magnetoelectric laminate composites (MLCs) made from the giant magnetostrictive material, Terfenol-D, and relaxor-based piezocrystals are far superior to the other contenders. The large ME voltage coefficient in MLCs was obtained because of the high piezoelectric voltage coefficient of the piezocrystals and large elastic compliances. In addition, an optimized thickness ratio between the piezoelectric and magnetostrictive phases and the direction of the magnetostriction also influence the magnitude of the ME coefficient. 相似文献
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