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Magnetocapacitance

About: Magnetocapacitance is a research topic. Over the lifetime, 497 publications have been published within this topic receiving 23846 citations.


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TL;DR: In this article, XRD analysis of samples calcined at a low temperature of 400°C for 2h shows the formation of a single phase perovskite rhombohedral structure.
Abstract: Multiferroic nanoceramics BiFe 1− x Ni x O 3 (where x =0, 0.15, 0.20, and 0.25) were prepared by the sol–gel method. XRD analysis of samples calcined at a low temperature of 400 °C for 2 h shows the formation of a single phase perovskite rhombohedral structure. Average particle size was observed to be ∼50 nm by TEM measurement. Magnetization was found to increase with increase in the concentration of Ni. Dielectric constant and dielectric loss were measured up to 1 MHz frequency. Variation of dielectric constant with temperature shows a peak at ∼395 °C (Neel temperature) for x =0.15 and the peak shifts towards lower temperature at a higher concentration of Ni with diffused type of phase transition. Magnetocapacitance was found to decrease with magnetic field. For BiFe 1− x Ni x O 3 (with x =0.15, 0.20, 0.25) nanoceramics, the fractional change of the magnetic field induced a change in the dielectric constant, which may well be approximated by Δ e / e = γM 2 , (where γ (magnetoelectric interaction ) is small and negative). A linear fit gave the value of γ of ∼−2.14×10 −3 , −2.11×10 −3 , and −2.09×10 −3 for BiFe 1− x Ni x O 3 nanoceramics, with x =0.15, 0.20, and 0.25, respectively.

34 citations

Journal ArticleDOI
TL;DR: In this article, the authors show that interfaces are the right way of increasing a coupling provided free charges are localized on these two-dimensional defects, and that the only tuning parameter for such strong coupling to arise is the dielectric relaxation time which is reached on tuning the operating frequency and the temperature in many different materials.
Abstract: Triggered by the revival of multiferroic materials, a lot of effort is presently underway to find a coupling between a capacitance and a magnetic field. We show in this paper that interfaces are the right way of increasing such a coupling provided free charges are localized on these two-dimensional defects. Starting from commercial diodes at room temperature and going to grain boundaries in giant permittivity materials and to ferroelectric domain walls, a clear magnetocapacitance is reported which is all the time more than a few per cent for a magnetic field of 90 kOe. The only tuning parameter for such strong coupling to arise is the dielectric relaxation time which is reached on tuning the operating frequency and the temperature in many different materials.

34 citations

Journal ArticleDOI
TL;DR: In this article, the shape of the ferroelectric loop of a single crystal was investigated and it was shown that the shape strongly depends on magnetic field and temperature, while its dependence does not directly correlate with the magnetocapacitance effect before the paraelectric transition.
Abstract: The ferroelectric properties of ${\text{MnWO}}_{4}$ single crystal have been investigated. Despite a relatively low remanent polarization, we show that the sample is ferroelectric. The shape of the ferroelectric loop of ${\text{MnWO}}_{4}$ strongly depends on magnetic field and temperature. While its dependence does not directly correlate with the magnetocapacitance effect before the paraelectric transition, the effect of magnetic field on the ferroelectric polarization loop supports magnetoelectric coupling.

34 citations

Journal ArticleDOI
TL;DR: In this paper, a series of superlattices composed of ferromagnetic La$ 0.7}$Ca$ 1.3}$MnO$_3$ (LCMO) and ferroelectric/paraelectric Ba$ 1-x}$Sr$_x$TiO$ 3$ (0$\leq $x$\LEq $1) were used for pulsed laser deposition.
Abstract: A series of superlattices composed of ferromagnetic La$_{0.7}$Ca$_{0.3}$MnO$_3$ (LCMO) and ferroelectric/paraelectric Ba$_{1-x}$Sr$_x$TiO$_3$ (0$\leq $x$\leq $1) were deposited on SrTiO$_3$ substrates using the pulsed laser deposition. Films of epitaxial nature comprised of spherical mounds having uniform size are obtained. Magnetotransport properties of the films reveal a ferromagnetic Curie temperature in the range of 145-158 K and negative magnetoresistance as high as 30%, depending on the type of ferroelectric layers employed for their growth (\QTR{it}{i.e.} '\QTR{it}{x'} value). Ferroelectricity at temperatures ranging from 55 K to 105 K is also observed, depending on the barium content. More importantly, the multiferroic nature of the film is determined by the appearance of negative magnetocapacitance, which was found to be maximum around the ferroelectric transition temperature (3% per \QTR{it}{tesla}). These results are understood based on the role of the ferroelectric/paraelectric layers and strains in inducing the multiferroism.

34 citations

Journal ArticleDOI
TL;DR: In this article, the authors report the observation of extremely high dielectric permittivity exceeding 10−9$ and magnetocapacitance of the order of 10−4% in a single crystal.
Abstract: We report the observation of extremely high dielectric permittivity exceeding ${10}^{9}$ and magnetocapacitance of the order of ${10}^{4}%$ in ${\mathrm{La}}_{0.875}{\mathrm{Sr}}_{0.125}\mathrm{Mn}{\mathrm{O}}_{3}$ single crystal. This phenomenon is observed below $270\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, and it exhibits a history dependence. These effects may be the consequence of strong competition and interplay among the charge, orbital, and spin degrees of freedom, resulting in nanoscale charge and spin dynamic inhomogeneities in the prepercolation regime of the phase segregation.

33 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20235
202212
202113
202020
201921
201819