Synthesis and magnetoelectric properties of multiferroic composites of lead lanthanum zirconate titanate and mesoporous cobalt ferrite

Ai, Ding; Xu, Jiwen; Huang, Can; Zhou, Wei; Zhao, Ling; Sun, Jian; Wang, Qing

doi:10.1016/j.scriptamat.2017.04.003

Cited by 15 publications

(4 citation statements)

References 35 publications

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“…Indeed, cobalt ferrites are very attractive for this purpose and have been used either in laminated [15,[42][43][44][45][46][47][48][49] or in particulate [50][51][52][53][54][55] composites. The direct ME effect consists of a change in the electric polarization induced by a magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Magnetostriction of CoFe2O4 and Its Role in Magnetoelectric Composites

et al. 2018

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Applications of magnetostrictive materials commonly involve the use of the dynamic deformation, i.e., the piezomagnetic effect. Usually, this effect is described by the strain derivative ∂λ=∂H, which is deduced from the quasistatic magnetostrictive curve. However, the strain derivative might not be accurate to describe dynamic deformation in semihard materials as cobalt ferrite (CFO). To highlight this issue, dynamic magnetostriction measurements of cobalt ferrite are performed and compared with the strain derivative. The experiment shows that measured piezomagnetic coefficients are much lower than the strain derivative. To point out the direct application of this effect, low-frequency magnetoelectric (ME) measurements are also conducted on bilayers CFO=PbðZr; TiÞO 3 . The experimental data are compared with calculated magnetoelectric coefficients which include a measured dynamic coefficient and result in very low relative error (<5%), highlighting the relevance of using a piezomagnetic coefficient derived from dynamic magnetostriction instead of a strain derivative coefficient to model ME composites. The magnetoelectric effect is then measured for several amplitudes of the alternating field H ac , and a nonlinear response is revealed. Based on these results, a trilayer CFO/PbðZr; TiÞO 3 /CFO is made exhibiting a high magnetoelectric coefficient of 578 mV=A (approximately 460 mV=cm Oe) in an ac field of 38.2 kA=m (about 48 mT) at low frequency, which is 3 times higher than the measured value at 0.8 kA=m (approximately 1 mT). We discuss the viability of using semihard materials like cobalt ferrite for dynamic magnetostrictive applications such as the magnetoelectric effect.

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Section: Introductionmentioning

confidence: 99%

Dynamic Magnetostriction of CoFe2O4 and Its Role in Magnetoelectric Composites

et al. 2018

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“…Up to the present time, the highest magnetoelectric coefficients have been achieved by combining a ferroelectric phase with high piezoelectric response and a ferromagnetic phase with large magnetostriction through strain mediation. Among ferroelectric phases, pure or doped PbZr x Ti 1-x O 3 (PZT) perovskite compounds close to the morphotropic phase boundary (MPB) are frequently employed due to their very high dielectric constant and electromechanical coupling [26][27][28][29][30][31][32][33]. As to the magnetostrictive phase, CoFe 2 O 4 (cobalt ferrite, CF) spinel oxide is a very interesting component although its large magneto-crystalline anisotropy limits its magnetic field sensitivity, that is, the slope of the magnetostriction curve vs. applied magnetic field [34,35].…”

Section: Introductionmentioning

confidence: 99%

A Glance at Processing-Microstructure-Property Relationships for Magnetoelectric Particulate PZT-CFO Composites

et al. 2020

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In this work, we investigated the processing-microstructure-property relationships for magnetoelectric (ME) particulate composites consisting of hard ferromagnetic CoFe2O4 (CFO) particles dispersed in a Nb-doped PbZrxTi1-xO3 (PZT) soft ferroelectric matrix. Several preparation steps, namely PZT powder calcination, PZT-CFO mixture milling and composite sintering were tailored and a range of microstructures was obtained. These included open and closed porosities up to full densification, PZT matrices with decreasing grain size across the submicron range down to the nanoscale and well dispersed CFO particles with bimodal size distributions consisting of submicron and micron sized components with varying weights. All samples could be poled under a fixed DC electric field of 4 kV/mm and the dielectric, piezoelectric and elastic coefficients were obtained and are discussed in relation to the microstructure. Remarkably, materials with nanostructured PZT matrices and open porosity showed piezoelectric charge coefficients comparable with fully dense composites with coarsened microstructure and larger voltage coefficients. Besides, the piezoelectric response of dense materials increased with the size of the CFO particles. This suggests a role of the conductive magnetic inclusions in promoting poling. Magnetoelectric coefficients were obtained and are discussed in relation to densification, piezoelectric matrix microstructure and particle size of the magnetic component. The largest magnetoelectric coefficient α33 of 1.37 mV cm−1 Oe−1 was obtained for submicron sized CFO particles, when closed porosity was reached, even if PZT grain size remained in the nanoscale.

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“…In order to overcome the issue of the scarcity of singlephase multiferroic materials, especially at the ambient temperature and above, several strategies have been adopted in order to develop new multiferroic materials at room temperature [14][15][16][17]. One of the most efficient ways is to synthesize composites materials formed by ferroelectric and ferromagnetic phases, which allows the use of a large variety of ferroelectric/piezoelectric and magnetic material couples, having both good ferroelectric and good ferromagnetic properties [5,[18][19][20][21]. An important issue with composites is the chemical compatibility of the targeted phases, and the formation of secondary phases (or of interphases) can be complex and challenging [22,23].…”

Section: Introductionmentioning

confidence: 99%

Tetragonal tungsten bronze/barium hexaferrite room-temperature multiferroic composite ceramics

Hajlaoui

Josse

et al. 2020

SN Appl. Sci.

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The spontaneously formed multiferroic composite based on tetragonal tungsten bronze structure was successfully synthesized in the form of ceramics by the solid-state reaction. The crystallization of the ceramics in the tetragonal tungsten bronze structure Ba 2 SmFeNb 4 O 15 and the presence of a secondary magnetic phase of barium hexaferrite BaFe 12 O 19 were established by structural investigation. The hysteresis behavior describing the polarization as a function of an applied electric field and the high ferroelectric Curie temperature ≈ 417 K evidenced the room-temperature ferroelectric properties of the synthesized material. While the piezoelectric coefficients were determined to be around 1.3 pm/V, the microscopic polar domains of the composite ceramics were established by microelectromechanical study. The hysteresis loop of the magnetization versus magnetic field and the high magnetic transition temperature ≈ 590 K evidenced the ferromagnetic properties of the secondary phase and its presence at room temperature. Moreover, the spatial distribution of the magnetic domains was determined microscopically. In this study, not only the multiferroic properties of the Ba 2 SmFeNb 4 O 15 /BaFe 12 O 19 composites have been studied and presented, but the distribution of the polar and magnetic properties was locally investigated as well.

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Synthesis and magnetoelectric properties of multiferroic composites of lead lanthanum zirconate titanate and mesoporous cobalt ferrite

Cited by 15 publications

References 35 publications

Dynamic Magnetostriction of CoFe2O4 and Its Role in Magnetoelectric Composites

Dynamic Magnetostriction of CoFe2O4 and Its Role in Magnetoelectric Composites

A Glance at Processing-Microstructure-Property Relationships for Magnetoelectric Particulate PZT-CFO Composites

Tetragonal tungsten bronze/barium hexaferrite room-temperature multiferroic composite ceramics

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