Multiferroic and magnetoelectric properties of Ba0.85Ca0.15Zr0.1Ti0.9O3–CoFe2O4 core–shell nanocomposite

Kumar, Ajith S.; Lekha, C.S. Chitra; Vivek, S.; Saravanan, Venkata; Nandakumar, K.; Nair, Swapna S.

doi:10.1016/j.jmmm.2016.02.065

Cited by 70 publications

(13 citation statements)

References 33 publications

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“…A clear hysteresis loop has been observed, indicating ferromagnetic behavior; the remnant magnetization ( M r ) and coercive field ( H c ) are about 21 emu/g and 800 Oe, respectively. The spontaneous magnetization ( M s ) was determined by the extrapolation of the magnetization curve to zero applied field and was ∼51 emu/g, which is almost consistent with previous reports. − Figure (f) shows room temperature ferroelectric hysteresis loops of the BaTiO 3 ceramic measured at 1 kHz. It is observed that the spontaneous magnetization ( P s ) and remnant polarization ( P r ) are respectively ∼27 and ∼14 μC/cm 2 , and the coercive field ( E c ) is about 6.5 kV/cm, indicating excellent ferroelectric properties.…”

Section: Results and Discussionsupporting

confidence: 88%

“…In addition to the converse magnetoelectric coupling effect, i.e., how the magnetism is regulated by electric field, the direct converse magnetoelectric coupling effect is also very important. The transient current method , was usually adopted to investigate the intrinsic ferroelectric properties of mixed fluids under different magnetic/electric fields, as shown in Figure . The ferroelectric parameters in the mixed fluids can be determined by the measurement of displacement current.…”

Section: Results and Discussionmentioning

confidence: 99%

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Anomalous Magnetoelectric Coupling Effect of CoFe₂O₄–BaTiO₃ Binary Mixed Fluids

Gao

Zhang

et al. 2019

ACS Appl. Electron. Mater.

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We report an anomalous magnetoelectric coupling effect of CoFe 2 O 4 −BaTiO 3 binary mixed fluids, which were prepared by distributing surfactant treated (oleic acid) magnetic CoFe 2 O 4 and ferroelectric BaTiO 3 nanoparticles into highly insulating base fluid (silicone oil). A strong coupling effect in this mixed fluid has been observed, in which both the remnant polarization/magnetization and coercive electric/magnetic field are found to be enhanced visibly in the presence of an external magnetic/electric field. Colossal converse and direct magnetoelectric coupling coefficients are estimated to be α H = 1.22 × 10 −4 Oe•cm/V and α E = 2.52 × 10 4 V/(cm•Oe), respectively. Moreover, this coefficient clearly depends on the volume fraction of the two kinds of particles and the applied external magnetic/electric field. Even more amazing, CoFe 2 O 4 also shows a strong magnetoelectric coupling effect with a coefficient as high as 4.2 × 10 −5 Oe•cm/V. Further analysis indicates that the aggregated, chain-like structure of the particles under the action of external fields is believed to be responsible for the clamping effect, which in turn induces the observable anomalous coefficient. The field generated chain-like structure shows intense relaxation behavior with a relaxation time of several minutes. These results provide valuable information for enhancing the coupling effect of mixed fluids and may be important for practical applications in magnetoelectric devices.

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Section: Results and Discussionsupporting

confidence: 88%

Section: Results and Discussionmentioning

confidence: 99%

Anomalous Magnetoelectric Coupling Effect of CoFe₂O₄–BaTiO₃ Binary Mixed Fluids

Gao

Zhang

et al. 2019

ACS Appl. Electron. Mater.

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“…As a consequence, it is very clear that since electron displacement polarization, ion displacement polarization, dipole transition polarization as well as space charge polarization can be established in low frequency range, all of them can contribute to the dielectric constant and thus large constant permittivity can be obtained. However, at higher frequency, the dielectric constant is mainly contributed by the displacement polarization because the relaxation time of this polarization is in the range of 10 −12 -10 −15 s [32][33][34][35][36], which is far less than the period of the applied field (more than 10 −6 s in this experiment). Other polarization mechanisms need more time to act, typical relaxation time is in the range of 10 −3 -10 −6 s. The different frequency stability of the dielectric constant of different samples can be attributed to the different polarization mechanisms, and the fast drop of the dielectric constant with frequency means that slow polarization process is the dominant in the material.…”

Section: Resultsmentioning

confidence: 70%

“…Different grain size can result in different ratios of grain boundary. On one hand, the uncompensated spins will be at the grain boundary, thus the uncompensated spins increase with decreasing the grain size, which comes from the nanoscale grains in the antiferromagnetic systems and/or destroyed spiral spin structure caused by the sintering time [32][33][34][35]. On the other hand, in a crystal particle, the magnetization should be increased because of the G-type antiferromagnetic helical structure.…”

Section: Resultsmentioning

confidence: 99%

Dielectric, ferroelectric and magnetic properties of Bi0.78La0.08Sm0.14Fe0.85Ti0.15O3 ceramics prepared at different sintering conditions

Li¹,

Wang²,

Gao³

et al. 2018

PAC

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Although BiFeO 3 (BFO) has attracted great attention due to its special physical properties as a typical single phase multiferroic material, the application is limited due to the formation of impurities, defects and so forth. Herein, we report improved multiferroic properties of Bi 0.78 La 0.08 Sm 0.14 Fe 0.85 Ti 0.15 O 3 (BLSFTO) ceramics by combination of co-doping and sintering schedule. BLSFTO multiferroic ceramics were prepared by using the conventional solid state reaction method and the effect of sintering time (2, 5, 10, 20 and 30 h) on the structural, dielectric and multiferroic properties was investigated systematically. The result indicates that stable BLSFTO phase with perovskite structure was formed for all the samples. Only some impurities such as Bi 2 O 4 can be observed when the sintering time is longer than 20 h, indicating that the sintering time can induce structural changes in BLSFTO and too long sintering time can remarkably increase the secondary phases. In addition, the frequency dependent dielectric properties show that sintering time has distinct effect on the frequency stability and the relaxation process. The result demonstrates that the enhanced magnetization, improved dielectric and ferroelectric properties may be correlated with the structural transformation, impurities, oxygen vacancies and grain morphology.

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“…The nanoceramic materials composed of nanosize crystallites display enhanced performances in comparison to conventionally fabricated bulk grained materials. The composite materials can be manufactured by merging ferrite and ferroelectric ceramics exhibiting magnetoelectric property are used for scientific and technological applications due to multiferroic properties [26,27].…”

Section: Introductionmentioning

confidence: 99%

Structural, microstructural and magnetic properties of sol–gel-synthesized novel BaZrO3–CoFe2O4 nanocomposite

Khirade¹

2019

J Nanostruct Chem

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A novel 0.5(BaZrO 3)-0.5(CoFe 2 O 4) (BZ-CF) nanocomposite ceramics has been synthesized using sol-gel autocombustion and mixing technique. The structural analysis was carried out using X-ray diffraction (XRD) technique. The XRD pattern shows mixed perovskite and spinel ferrite phases with simple cubic structure for the BZ-CF nanocomposite. The calculated average crystallite size of the samples varies of the order of the nanoregime. The lattice parameter (a) and other structural parameter were obtained using XRD data and it is found that the structural data of pure parent ceramics were in the reported range. The surface morphology of grains of the present samples was examined using field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The FESEM images show spherical particles with average grain size in the nanometer range. Compositional stoichiometry was confirmed by energy dispersive spectrum (EDX) analysis. Fourier-transform infrared spectra (FTIR) of barium zirconate (BZ) and cobalt ferrite (CF) confirmed the perovskite and spinel ferrite structure, respectively. However, the FTIR spectrum of BZ-CF nanocomposite confirmed the change in crystal structure due to mixed phases. The M-H curves recorded at room temperature using pulse field hysteresis loop tracer technique exhibits a weak hysteresis loop for BZ-CF nanocomposite, perfectly diamagnetic nature for BZ nanoceramics, and typical ferromagnetic hysteresis loop for pure CF nanoceramics.

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Multiferroic and magnetoelectric properties of Ba0.85Ca0.15Zr0.1Ti0.9O3–CoFe2O4 core–shell nanocomposite

Cited by 70 publications

References 33 publications

Anomalous Magnetoelectric Coupling Effect of CoFe₂O₄–BaTiO₃ Binary Mixed Fluids

Anomalous Magnetoelectric Coupling Effect of CoFe₂O₄–BaTiO₃ Binary Mixed Fluids

Dielectric, ferroelectric and magnetic properties of Bi0.78La0.08Sm0.14Fe0.85Ti0.15O3 ceramics prepared at different sintering conditions

Structural, microstructural and magnetic properties of sol–gel-synthesized novel BaZrO3–CoFe2O4 nanocomposite

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Multiferroic and magnetoelectric properties of Ba0.85Ca0.15Zr0.1Ti0.9O3–CoFe2O4 core–shell nanocomposite

Cited by 70 publications

References 33 publications

Anomalous Magnetoelectric Coupling Effect of CoFe2O4–BaTiO3 Binary Mixed Fluids

Anomalous Magnetoelectric Coupling Effect of CoFe2O4–BaTiO3 Binary Mixed Fluids

Dielectric, ferroelectric and magnetic properties of Bi0.78La0.08Sm0.14Fe0.85Ti0.15O3 ceramics prepared at different sintering conditions

Structural, microstructural and magnetic properties of sol–gel-synthesized novel BaZrO3–CoFe2O4 nanocomposite

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Anomalous Magnetoelectric Coupling Effect of CoFe₂O₄–BaTiO₃ Binary Mixed Fluids

Anomalous Magnetoelectric Coupling Effect of CoFe₂O₄–BaTiO₃ Binary Mixed Fluids