Topic
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, a theory for the magnetocapacitance of a partially screened two-dimensional (2D) electron gas is proposed, which is sensitive to different types of screening in a 2D electron gas with an integer filling factor.
Abstract: A theory for the magnetocapacitance of a partially screened two-dimensional (2D) electron gas is proposed. The model investigated is sensitive to different types of screening in a 2D electron gas with an integer filling factor: the so-called conventional approach and the self-consistent approximation introduced in the present paper. The calculations point to the importance of the self-consistent treatment of the magnetocapacitance of a 2D electron gas under the conditions of an integer filling factor. The final self-consistent results are qualitatively consistent with the available experimental data.
Patent•
20 Apr 2016
TL;DR: In this paper, a thin cell, which is a packaging module of a charging/discharging component, is revealed, consisting of a magnetocapacitance module and an IC (Integrated Circuit) control chip.
Abstract: The invention discloses a thin cell, which is a packaging module of a charging/discharging component. The packaging module mainly comprises a magnetocapacitance module and an IC (Integrated Circuit) control chip which are arranged on a printed circuit of a circuit board, wherein the magnetocapacitance module has the functions of stability and quickness in charging, large charge capacity and durability in discharging; the IC control chip has a power supply management function, and can control the magnetocapacitance module to charge/discharge. In addition, the invention also discloses a corresponding power supply device, which is provided with a lamp connector for connecting a lighting bulb with the power supply device, and the thin film cell is used to supply power, so that the connected lighting bulb can be kept for continuous lighting for a long time.
TL;DR: In this article, the spontaneous magnetocapacitance (i.e., the temperature dependence of dielectric constant in the absence of a magnetic field) of the orthorhombic ferroelectromagnet TbMnO3 in the incommensurable antiferromagnetic states is phenomenologically and numerically analyzed.
Abstract: The spontaneous magnetocapacitance (i.e., the temperature dependence of dielectric constant in the absence of a magnetic field) of the orthorhombic ferroelectromagnet TbMnO3 in the incommensurable antiferromagnetic states is phenomenologically and numerically analyzed. It is shown that both the inhomogeneous magnetoelectric (ME) energy of the third order, which creates the electric polarization, and the ME anisotropy of the fourth order must be considered to get qualitative agreement with the experiment. The inhomogeneous ME energy induces the peak on the ezz(T) which satisfies the Curie law, and a small peak on the exx(T) at the vicinity of the temperature of the ferroelectric (FE) ordering. The anisotropic ME energy of the fourth order is responsible for the appearance and character of the breaks on the ezz and exx temperature dependences at the Neel temperature, namely, a decrease in ezz and an increase in exx in the event of antiferromagnetic ordering. It is shown that the competition of the anisotrop...
01 Jan 2012
TL;DR: The magnetocapacitance effect in YFeO3 single crystal can be explained by the combination of the MaxwellWagner space charge effect and/or magnetoresistance effect, depending on the frequency range as mentioned in this paper.
Abstract: YFeO3 single crystal displays two relaxor-like dielectric relaxations, one at low temperature (170300 K) and one at high temperature (370520 K), which are attributed to the activation of electrons and oxygen vacancies, respectively. Above the temperature at which electrons are activated, the sample displays a large magnetocapacitance effect. Comparison of the impedance Cole-Cole plots measured with and without applied magnetic field reveals that the occurrence of magnetocapacitance effect is accompanied with an increasing in DC conductivity under magnetic field after the activation of electrons, which is explained by the enhancement of electron jumping in Fe2b-O-Fe3b chains by magnetic field. Thus the magnetocapacitance effect in YFeO3 single crystal can be explained by the combination of the MaxwellWagner space charge effect and/or magnetoresistance effect, depending on the frequency range.
31 Mar 2021
TL;DR: In this article, the authors discuss three commonly used methods in multiferroic studies; the lock-in technique, the Sawyer-Tower (S-T) circuit and dielectric constant measurements.
Abstract: Magnetoelectric multiferroics are solid-state materials which exhibit a coupling between ferroelectric and magnetic orders. This phenomenon is known as the magnetoelectric (ME) effect. Multiferroic materials possess a wide range of potential applications in such fields as metrology, electronics, energy harvesting & conversion, and medicine. Multiferroic research is facing two main challenges. Firstly, scientists are continuously trying to obtain a material with sufficiently strong, room-temperature ME coupling that would enable its commercial application. Secondly, the measurement techniques used in multiferroic research are often problematic to implement in a laboratory setting and fail to yield reproducible results. The aim of the present work is to discuss three most commonly used methods in multiferroic studies; the lock-in technique, the Sawyer-Tower (S-T) circuit and dielectric constant measurements. The paper opens with a general description of multiferroics which is followed by mathematical representation of the ME effect. The main body deals with the description of the aforementioned measurement techniques. The article closes with a conclusion and outlook for future research.