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首页> 外文期刊>IEEE Transactions on Magnetics >Enhancement of the Magnetoelectric Effect in Multiferroic CoFe2O4/PZT Bilayer by Induced Uniaxial Magnetic Anisotropy
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Enhancement of the Magnetoelectric Effect in Multiferroic CoFe2O4/PZT Bilayer by Induced Uniaxial Magnetic Anisotropy

机译：感应单轴磁各向异性增强多铁性CoFe 2 O 4 / PZT双层中的磁电效应

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摘要

In this paper, we have compared magnetic, magnetostrictive, and piezomagnetic properties of isotropic and anisotropic cobalt ferrite pellets. The isotropic sample was prepared by the ceramic method while the sample exhibiting uniaxial anisotropy was made by reactive sintering using spark plasma sintering (SPS). This technique permits us to induce a magnetic anisotropy in cobalt ferrite in the direction of the applied pressure during the SPS process. Sample with uniaxial anisotropy revealed a higher longitudinal magnetostriction and piezomagnetism compared with the isotropic sample, but the transversal magnetostriction and piezomagnetism were dramatically reduced. In the case of magnetoelectric (ME) layered composite, the ME coefficient is directly related to the sum of the longitudinal and transversal piezomagnetic coefficients. These two coefficients being opposite in sign, the use of material exhibiting high longitudinal and low transversal piezomagnetic coefficient (or vice versa) in ME devices is expected to improve the ME effect. Hence, ME bilayer devices were made using isotropic and anisotropic cobalt ferrite stuck with a lead zirconate titanate layer. ME measurements at low frequencies revealed that bilayer with anisotropic cobalt ferrite exhibits an ME coefficient three times higher than a bilayer with isotropic cobalt ferrite. We also investigated the behavior of such composites when excited at resonant frequency.
机译：在本文中，我们比较了各向同性和各向异性的钴铁氧体颗粒的磁，磁致伸缩和压磁特性。各向同性样品通过陶瓷法制备，而表现出单轴各向异性的样品是通过使用火花等离子体烧结（SPS）的反应性烧结制备的。该技术使我们能够在SPS过程中沿施加压力的方向在钴铁氧体中感应出磁各向异性。与各向同性样品相比，具有单轴各向异性的样品显示出更高的纵向磁致伸缩性和压磁性，但横向磁致伸缩性和压磁性显着降低。对于磁电（ME）层状复合材料，ME系数与纵向和横向压电系数之和直接相关。这两个系数的符号相反，因此在ME设备中使用具有高纵向和低横向压电系数（反之亦然）的材料有望改善ME效果。因此，使用粘附有锆钛酸铅钛酸盐层的各向同性和各向异性钴铁氧体来制造ME双层器件。低频下的ME测量显示，具有各向异性钴铁氧体的双层的ME系数比具有各向同性钴铁氧体的双层的ME系数高三倍。我们还研究了这种复合材料在共振频率下激发时的行为。

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