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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20 Jul 2009
TL;DR: In this article, a single-phase rhombohedral perovskite structure was obtained from the hysteresis loops and the dielectric constant increased with an increase in the magnetic field.
Abstract: The Bi 0.9 Ba 0.1 Fe 0.85 Mn 0.15 O 3 ceramic sample was prepared by sol-gel process. XRD analysis showed that it was the single-phase rhombohedral perovskite structure. A weak ferromagnetic and ferroelectric were obtain from the hysteresis loops. The dielectric constant which increased with an increase in the magnetic field showed that the Ba-Mn codoped BFO has greater magnetocapacitance effects.
1 citations
TL;DR: In this article, the propagation direction of fractional quantum Hall effect (FQHE) edge states has been investigated via the symmetry properties of the multi-terminal capacitances of a two-dimensional electron gas.
Abstract: The propagation direction of fractional quantum Hall effect (FQHE) edge states has been investigated experimentally via the symmetry properties of the multi-terminal capacitances of a two-dimensional electron gas. Although strong asymmetries with respect to zero magnetic field appear, no asymmetries with respect to even denominator Landau level filling factor ν are seen. This indicates that current-carrying FQHE edge states propagate in the same direction as integer QHE edge states. In addition, anomalous capacitance features, indicative of enhanced bulk conduction, are observed at ν= 1 2 and 3 2 .
1 citations
TL;DR: In this paper, the angular dependences of the capacitance of structures based on PbSnTe were studied experimentally at T = 4.2 K at various bias voltages, which have a distinct anisotropic pattern in the magnetic field direction with capacitance modulation.
Abstract: The angular dependences of the capacitance of structures based on PbSnTe:In films in a magnetic field B ≤ 4 T at various bias voltages, which have a distinct anisotropic pattern in the magnetic-field direction with capacitance modulation approximately by a factor of 1.5–2, are studied experimentally at T = 4.2 K. The data obtained are compared with the experimental anisotropic angular dependences of the space-charge-limited current with current modulation up to a factor of 102–104 or greater. A qualitative model of the results obtained is considered.
1 citations
TL;DR: In this paper , the authors used magnetocapacitance and magnetoresistance measurements to investigate nonequilibrium phenomena in a bilayer electron system based on GaAs/AlGaAs heterostructures.
Abstract: In the present Letter, we have used magnetocapacitance and magnetoresistance measurements to investigate nonequilibrium phenomena in a bilayer electron system based on GaAs/AlGaAs heterostructures. The magnetic field ramping drives the bilayer electron system out of equilibrium, leading to magnetoresistance hysteresis and spikes. Unlike magnetoresistance, magnetocapacitance results intriguingly show hysteresis even when both layers are in the quantum Hall state. The hysteresis is accompanied by interlayer charge transfer, but the disequilibrium is not limited to interlayer imbalance. Results show that the edge-bulk imbalance can be the initial ground for the appearance of hysteresis. In addition, the nonequilibrium states are observed in which the total, rather than individual, layer densities determine the magnetic field and gate voltage dependencies.
1 citations
Dissertation•
28 Jan 2010
TL;DR: In this article, a multiferroic composite of ferromagnetic La2/3Ca1/3MnO3 and ferroelectric BaTiO3 (BTO) was used to study magnetoelectric coupling.
Abstract: Magnetoelectric multiferroics are materials in which the order phenomena ferromagnetism and ferroelectricity coexist. Due to pronounced magnetic as well as electric susceptibility, this class of material is especially suitable for the study of magnetoelectric coupling phenomena. However, the coexistence of the ferroic orders has rarely been observed in single phase materials. Composites give the possibility to further study magnetoelectric effects Within this work, the combination of ferromagnetic La2/3Ca1/3MnO3 (LCMO) and ferroelectricBaTiO3 (BTO) constitutes a multiferroic composite, in which a magnetoelectric coupling can occur via the interfaces. LCMO-BTO superlattices have been deposited on MgO substrates with the metallorganic aerosol deposition technique. Using coplanar electrodes on the top of the films, dielectric properties have been measured by a capacitance bridge. The electric capacitance and the dielectric loss as a function of sample temperature and external magnetic field shall give information about potential magnetoelectric couplings. Comparison of the experimental results with model calculations of the dielectric characteristics of a Maxwell-Wagner-circuit shall clarify, to what extent the observed magnetocapacitance can be attributed to the colossal magnetoresistance (CMR), a well-known property of LCMO. To further study the influence of the superlattice interfaces on the magnetoelectric properties, an interface-modified superlattice has been fabricated, in which thin layers of LaMnO3 have been deposited at every LCMO-BTO interface. The modified sample, in comparison to a conventional one, exhibiting the same thicknesses of LCMO- and BTO-layers, first of all shows enhanced magnetic and transport properties. The effect of the modification and thus the influence of the interfaces is discussed within LCMO as a material possessing strong electronic as well as polaronic correlations.
1 citations