Journal ArticleDOI
Impedance spectroscopy of multiferroic Pb Zr x Ti 1 − x O 3 ∕ Co Fe 2 O 4 layered thin films
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TLDR
In this article, the effect of various PZT/CFO configurations having three, five, and nine layers has been systematically investigated by impedance and modulus spectroscopy, and the results showed evidence of three types of conduction process at elevated temperature: (i) low frequency $(l1\phantom{\rule{0.3em}{0ex}}\mathrm{MHz}$ and (ii) midfrequency conductivity $(l10\phantastic{\rule} 0.Abstract:
The electrical properties of ferroelectric $\mathrm{Pb}(\mathrm{Zr},\mathrm{Ti}){\mathrm{O}}_{3}$ (PZT) and ferromagnetic $\mathrm{Co}{\mathrm{Fe}}_{2}{\mathrm{O}}_{4}$ (CFO) thin film multilayers (MLs) fabricated by pulsed laser deposition technique has been studied by impedance and modulus spectroscopy. The effect of various PZT/CFO configurations having three, five, and nine layers has been systematically investigated. The transmission electron microscopy images revealed that the ML structures were at least partially diffused near the interface. Diffraction patterns indicate clear PZT and CFO crystal structures in the interior and at the interface of the ML structure. Room temperature micro-Raman spectra indicate separate PZT and CFO phases in ML structure without any impurity phase. We studied frequency and temperature dependencies of impedance, electric modulus, and ac conductivity of ML thin films in the ranges of $100\phantom{\rule{0.3em}{0ex}}\mathrm{Hz}\char21{}1\phantom{\rule{0.3em}{0ex}}\mathrm{MHz}$ and $200\char21{}650\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, respectively. We observed two distinct electrical responses in all the investigated ML films at low temperature $(l400\phantom{\rule{0.3em}{0ex}}\mathrm{K})$ and at elevated temperature $(g400\phantom{\rule{0.3em}{0ex}}\mathrm{K})$. We attributed these contributions to the grain effects at low temperature and grain boundary effects at high temperature. We explained this electrical behavior by Maxwell-Wagner-type contributions arising from the interfacial charge at the interface of the ML structure. Master modulus spectra indicate that the magnitude of grain boundary compared to grain becomes more prominent with the increase in the number of layer. The frequency dependent conductivity results well fitted with the double power law, $\ensuremath{\sigma}(\ensuremath{\omega})=\ensuremath{\sigma}(0)+{A}_{1}{\ensuremath{\omega}}^{{n}_{1}}+{A}_{2}{\ensuremath{\omega}}^{{n}_{2}}$, and the results showed evidence of three types of conduction process at elevated temperature: (i) low frequency $(l1\phantom{\rule{0.3em}{0ex}}\mathrm{kHz})$ conductivity is due to long-range ordering (frequency independent), (ii) midfrequency conductivity $(l10\phantom{\rule{0.3em}{0ex}}\mathrm{kHz})$ may be due to the short-range hopping, and (iii) high frequency $(l1\phantom{\rule{0.3em}{0ex}}\mathrm{MHz})$ conduction is due to the localized relaxation hopping mechanism.read more
Citations
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Journal ArticleDOI
Multifunctional magnetoelectric materials for device applications.
TL;DR: This review article summarises the development of different kinds of multiferroic material: single-phase and composite ceramic, laminated composite and nanostructured thin films.
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Effect of Mn substitution on electrical and magnetic properties of Bi0.9La0.1FeO3
TL;DR: In this paper, the electrical and magnetic properties of polycrystalline samples of Bi0.90La0.10(Fe1−xMnx)O3 (x=0, 0, 0.05,0.15, and 0.20) were prepared using a novel mechanical activation followed by a conventional solid-state reaction technique.
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Structural Investigation of MFe2O4 (M = Fe, Co) Magnetic Fluids
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Dielectric relaxation, resonance and scaling behaviors in Sr3Co2Fe24O41 hexaferrite.
TL;DR: The results indicate that the dielectric dispersion mechanism in SCFO is temperature independent at low frequencies and temperature dependent at high frequencies due to the domination of resonance behavior.
Journal ArticleDOI
Structure and electrical properties of lead-free Bi0.5Na0.5TiO3-based ceramics for energy-storage applications
Qi Xu,Qi Xu,Hanxing Liu,Lin Zhang,Juan Xie,Hua Hao,Minghe Cao,Zhonghua Yao,Michael T. Lanagan +8 more
TL;DR: In this article, a new energy-storage ceramic system based on (1 − x)(Bi0.5Na 0.5TiO3-BaTiO 3) and NaTaO3 ((1− x)(BNT-BT)-xNT) is reported.
References
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The Renaissance of Magnetoelectric Multiferroics
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TL;DR: Magnetoelectric multiferroics combine ferromagnetic magnetization and ferroelectricity in the same phase and have tremendous potential for applications, not only because they possess the properties of both parent phenomena, but also because coupling between ferromagnetism and electric polarization can lead to additional novel effects as discussed by the authors.
Journal ArticleDOI
Applications of Modern Ferroelectrics
TL;DR: Electroelectric arrays of lead zirconate titanate have been reported on Pt nanowire interconnects and nanorings with 5-nanometer diameters and electron emission from ferroelectrics yields cheap, high-power microwave devices and miniature x-ray and neutron sources.
Journal ArticleDOI
Multiferroic BaTiO3-CoFe2O4 Nanostructures.
Haimei Zheng,Jian Wang,Samuel E. Lofland,Z. Ma,L. Mohaddes-Ardabili,T. Zhao,Lourdes Salamanca-Riba,S. R. Shinde,Satishchandra Ogale,Feiming Bai,Dwight Viehland,Y. Jia,Darrell G. Schlom,Manfred Wuttig,Alexander L. Roytburd,Ramamoorthy Ramesh +15 more
TL;DR: Thermodynamic analyses show that the magnetoelectric coupling in a nanostructured BaTiO3-CoFe2O4 ferroelectromagnet can be understood on the basis of the strong elastic interactions between the two phases.