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The Magnetoelectric Effect of a Ni0.3Zn0.62Cu0.08Fe2O4 - PbFe0.5Nb0.5O3 Multilayer Composite

100%
Guzdek P., Kapusta C., Sikora M., Góra Ł.
Archives of Metallurgy and Materials
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2014
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issue 3
2
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Multiferroic Cobalt Ferrite-Lead Iron Tungstate Composites

100%
Kulawik J., Szwagierczak D., Guzdek P.
Acta Physica Polonica A
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2012
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vol. 121
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issue 1
122-124
EN
The paper presents dielectric, magnetic and magnetoelectric properties of multiferroic bulk composites based on CoFe_2O_4 ferrite and Pb(Fe_{2/3}W_{1/3})O_3 relaxor. X-ray diffraction analysis and scanning electron microscopy observations of ceramic samples revealed two-phase composition and fine grained microstructure with uniformly distributed ferromagnetic and ferroelectric phases. Dielectric permittivity measured in a temperature range 218-773 K at frequencies of 10 Hz-2 MHz exhibits high and broad maxima attributed to dielectric relaxation. The hysteresis determined in a temperature range 4-393 K for magnetic field changing from - 80 kOe to 80 kOe is typical of hard magnetic materials. Saturation magnetizations and coercivities were found to decrease with increasing temperature. The courses of zero field cooled and field cooled magnetization versus temperature curves measured in the temperature range 4-393 K imply spin glass behavior of the ferrite and antiferromagnetic transition of the relaxor at low temperatures. The ferrite-relaxor composite shows high magnetoelectric voltage coefficient which distinctly increases with increasing frequency of ac magnetic field and is slightly higher for higher ac and dc magnetic fields.
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X-Ray Diffraction, Mössbauer Spectroscopy, and Magnetoelectric Effect Studies of Multiferroic Bi₅Ti₃FeO₁₅ Ceramics

88%
Pikula T., Guzdek P., Dzik J., Lisinska-Czekaj A., Jartych E.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
296-299
EN
Bi₅Ti₃FeO₁₅ ceramics belongs to multiferroic class of materials. In this work it was prepared by solid-state sintering method and investigated by X-ray diffraction, Mössbauer spectroscopy, and magnetoelectric effect measurements. As it was proved by X-ray diffraction studies the single-phase Bi₅Ti₃FeO₁₅ compound was obtained. The Mössbauer investigations revealed paramagnetic character of the compound at room temperature as well as at 80 K. Magnetoelectric measurements were carried out at room temperature using lock-in dynamic method and they proved presence of magnetoelectric coupling in this material. Additional magnetoelectric studies were carried out after subsequent electric poling of the sample. It was found that the maximum value of the coupling coefficient was almost twice bigger than in the case without the initial poling and reached a value of α_{ME} ≈ 20.7 mV cm⁻¹ Oe⁻¹.
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