Topic
Magnetocapacitance
About: Magnetocapacitance is a research topic. Over the lifetime, 497 publications have been published within this topic receiving 23846 citations.
Papers published on a yearly basis
Papers
More filters
Patent•
25 Mar 2015
TL;DR: In this article, the magnetocapacitance pointer device comprises shell components, a conductive shell component, a ferrite core, a non-magnetic conductive cartridge, a control circuit board, a conductor cartridge base, the conductor elastomer, fixed bases and a power supply.
Abstract: The invention relates to a magnetocapacitance pointer device. The magnetocapacitance pointer device comprises shell components, a conductive shell component, a ferrite core, a non-magnetic conductive cartridge, a control circuit board, a conductor cartridge base, a conductor elastomer, fixed bases and a power supply, wherein the non-magnetic conductive cartridge, the conductor cartridge base, the conductor elastomer, the control circuit board and the conductive shell component constitute a conductor path.
TL;DR: In this article, three mechanisms of capacitance enhancement by a magnetic field have been analyz-ed, and three approaches are of potential for exploring tunable dielectric materials.
Abstract: Three mechanisms of capacitance enhance-ment by a magnetic field have been analyz-ed. Through semiclassical description of charge movement under a magnetic field, it can be shown that the charge density gradient, a term coupled with magnetic field strength, could be used to augment the magnetocapacitance. Also a magnetic field could enhance capacitance on the polarized metallic material surface due to the electron gas excitation. Finally, a magnetic field could produce oscillation in the capacitance when relating the polarization with the magnetization through the modification of standard free energy model. By deriving these three mechanisms, it can be seen that three approaches are of potential for exploring tunable dielectric materials.
01 Jan 2014
TL;DR: In this article, the structural, dielectric and magnetic properties of polyvinylidene fluride composite film with different concentration of PVDF: 20, 30 and 40 wt% are reported.
Abstract: Structural, Dielectric and magnetic properties 0.3 CoFe2O4–0.7 BaTiO3–PVDF (polyvinylidene fluride) composite film with different concentration of PVDF: 20, 30 and 40 wt% are reported here for the first time. The structural analysis was carried out using X-Ray diffraction technique, which indicates cubic spinel structure for ferrite phase CoFe2O4 (CFO) and tetragonal structure for ferroelectric phase BaTiO3 (BT). The average grain size was observed to be (~106 nm, 30 nm and 26 nm) for 20%, 30% and 40% addition of PVDF by using AFM analysis. The dielectric constant variation with temperature at three fixed frequencies (1 kHz, 50 kHz and 100 kHz) was studied and it was found that the dielectric constant and dielectric loss decrease with increasing amount of polyvinylidene fluride. The values of ac conductivity for 0.3CoFe2O4 – 0.7BaTiO3 –PVDF composite film were found to decrease with increasing concentration of PVDF. The ferroelectric hysteresis loops also indicate that the value of polarization decreases with the addition of PVDF and the value of remnant polarization for 20% PVDF was found to be 0.5286 µC/cm 2 . The magnetocapacitance of 0.3 CoFe2O4–0.7 BaTiO3–0.3 PVDF was found higher for this composition. Copyright © 2014 VBRI press.
24 Mar 2023
TL;DR: In this article , the terahertz response of a bulk single crystal of La$ 0.875$Sr$ 1.125$MnO$_3$ at around its Curie temperature was studied, observing large changes in the real and imaginary parts of the optical conductivity as a function of magnetic field.
Abstract: We have studied the terahertz response of a bulk single crystal of La$_{0.875}$Sr$_{0.125}$MnO$_3$ at around its Curie temperature, observing large changes in the real and imaginary parts of the optical conductivity as a function of magnetic field. The terahertz resistance and capacitance extracted from the optical conductivity rapidly increased with increasing magnetic field and did not show any sign of saturation up to 6 T, reaching 60% and 15%, respectively, at 180 K. The observed terahertz colossal magnetoresistance and magnetocapacitance effects can be qualitatively explained by using a two-component model that assumes the coexistence of two phases with vastly different conductivities. These results demonstrate the potential use of perovskite manganites for developing efficient terahertz devices based on magnetic modulations of the amplitude and phase of terahertz waves.
13 Sep 2021
TL;DR: In this article, the origin of magnetocapacitance effect in NiO prepared using solution combustion method was explored in the NiO powder showed formation of pure phase and the change in capacitance with applied magnetic field was of the order of 6.5 % at 1.2 MHz.
Abstract: The origin of magnetocapacitance effect in NiO prepared using solution combustion method was explored in this work. The structural analysis of NiO powder showed formation of pure phase. The change in capacitance with applied magnetic field was of the order of 6.5 % at 1.2 MHz. The positive sign of magnetocapacitance inferred that the process is interface mediated and supported by diminished magnetoresistance at the same frequency. The origin of this interface effect was explored using thermoluminescence study. The deconvolution of glow curve inferred formation of deep level defects with the number density of the order of 8.46 x 104 and activation energy or formation energy of 1.4 eV. The presence of deep level defects corroborated the observation of positive magnetocapacitance in NiO supporting the defect mediated change in capacitance.