Magnetocapacitance

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

Ferroelectric Behavior and Magnetocapacitance Effect Caused by Fe2+ in Ho3Fe5O12 Ceramics

Abstract: Iron garnet Ho3Fe5O12 ceramics, in which Ho3+ is a rare earth ion with strong magnetic moment, were prepared and carefully studied. The emergence of Fe2+ was shown to be very important for the ferroelectric, magnetoelectric (ME) and magnetocapacitance (MC) properties of Ho3Fe5O12 ceramics. Room temperature P-E hysteresis loops that were never reported before for iron garnets were explained by local dipoles related with Fe2+. The ME coupling indicated by the magnetic field-induced variation of remanent polarization was further confirmed by oxygen treatment. The MC effect was observed in a broad temperature range (2–300 K) and it is also connected to the presence of Fe2+.

Magnetoelectric and magnetodielectric properties of SBN–CMFO nanocomposites

Abstract: The paper reports synthesis of nanoparticles of Sr0.5Ba0.5Nb2O6 (SBN) and Co1.2−xMnxFe1.8O4 (CMFO) via ceramic and hydroxide co-precipitation routes, respectively. The nanopowders of SBN–CMFO0.1 (MSBN0.1) and SBN–CMFO0.3 (MSBN0.3) are compacted together to form the desired magnetoelectric/magnetodielectric (ME/MD) composites. The Bi2O3 is used as a sintering aid. The Bi2O3 at three weight percent is observed to cause agglomeration of SBN and CMFO particles and improve the magnetomechanical coupling. The paper reports synthesis, structural and morphological studies on the MSBN composites. The composites are investigated for their dielectric, ME and MD properties. The results on the magnetocapacitance (MC) are observed interesting and could be correctly understood in terms of the stress-induced variation in the dielectric constant. The MC is observed to remain fairly constant between 10 and 500 kHz and possess a useful magnitude of nearly 4 %.

Study on magnetocapacitance effect of magnetic particle polymer matrix composite system by finite element method

Abstract: In this paper, the magnetocapacitance effect of magnetic particles Fe3O4 embedded in polymer insulating matrix polydimethylsiloxane is investigated using finite element method by commercial software Comsol Multiphysics. With this method, the process of the capacitance variation under different magnetic field is simulated, and the factors influencing magnetocapacitance effect are studied. In particular, we apply the micro-macro coupling method for simulation analysis due to a large amount of calculation in the actual model. First, a three-dimensional microscopic model is calculated to obtain the effect of the magnetic field on the equivalent permittivity of the composite. The relationship is then substituted into the material property of the macroscopic model to simulate the magnetocapacitance effect. The results show that the composite exhibits magnetocapacitance characteristics that are related to the magnetic field intensity, particle size, and particle concentration. The capacitance value increases with the magnetic field at certain particle size and particle volume fraction. Meanwhile, the capacitance value at the same magnetic field increases with the particle size and particle volume fraction. The numerical results are consistent with the experimental results. The simulation model can provide a reference for research on the magnetocapacitance effect involving similar composite systems composed of magnetic particles and polymer matrix.