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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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Journal ArticleDOI
TL;DR: In this paper, the magnetic and magnetocaloric effect in antiferromagnetic perovskite-type EuTiO 3 was investigated using a Heisenberg Hamiltonian.

13 citations

Journal ArticleDOI
TL;DR: Through investigating the spin-dependent charging energy of nanoscale systems, a new concept of intrinsic molecular magnetocapacitance (MC) is introduced, which can be as high as 12%.
Abstract: Capacitance of a nanoscale system is usually thought of having two contributions, a classical electrostatic contribution and a quantum contribution dependent on the density of states and/or molecular orbitals close to the Fermi energy. In this letter we demonstrate that in molecular nano-magnets and other magnetic nanoscale systems, the quantum part of the capacitance becomes spin-dependent, and is tunable by an external magnetic field. This molecular magnetocapacitance can be realized using single molecule nano-magnets and/or other nano-structures that have antiferromagnetic ground states. As a proof of principle, first-principles calculation of the nano-magnet [Mn3O(sao)3(O2CMe)(H2O)(py)3] shows that the charging energy of the high-spin state is 260 meV lower than that of the low-spin state, yielding a 6% difference in capacitance. A magnetic field of ~40T can switch the spin state, thus changing the molecular capacitance. A smaller switching field may be achieved using nanostructures with a larger moment. Molecular magnetocapacitance may lead to revolutionary device designs, e.g., by exploiting the Coulomb blockade magnetoresistance whereby a small change in capacitance can lead to a huge change in resistance.

13 citations

Journal ArticleDOI
TL;DR: In this paper, the doping effects on the crystal structure, magnetic properties and dielectric properties were systematically studied, showing that all samples are single phase and crystallized in a hexagonal structure belonging to the P63cm space group.
Abstract: Single phase ErCuxMn1?xO3(0 ? x ? 0.1) compounds were prepared by the standard solid-state reaction. The doping effects on the crystal structure, magnetic properties and dielectric properties were systematically studied. X-ray diffraction patterns show that all samples are single phase and crystallized in a hexagonal structure belonging to the P63cm space group. Rietveld refinement indicates that the a lattice parameter increases and the c lattice parameter decreases with increasing Cu concentration. The magnetic moments of the doped samples are enhanced, which is due to modification of the frustrated spin arrangement by the superexchange interaction between Cu2+ ions and Mn3+ ions. The specific heat capacity data show a peak at the antiferromagnetic transition temperature, which decreases from 77?K for x = 0 to 61?K for x = 0.1. The samples become more conductive upon doping, which is responsible for the increase in the dielectric constant. A large negative magnetocapacitance effect was observed in paramagnetic-state ErCu0.05Mn0.95O3 at 300?K.

13 citations

Journal ArticleDOI
17 Dec 2012
TL;DR: In this article, anisotropic properties of magnetism and dielectricity in CaBaCo4O7 single crystal, which has layered structure consisting of CoO4 tetrahedra, were investigated.
Abstract: We have investigated anisotropic properties of magnetism and dielectricity in CaBaCo4O7 single crystal, which has layered structure consisting of CoO4 tetrahedra. The crystallographic symmetry of CaBaCo4O7 is Pbn21 at room temperature, which breaks the inversion symmetry. The magnetic moments along the a- and b-axes rise at 64 K, suggesting a weak ferromagnetism. We have also observed an increase of electric polarization and a peak of dielectric constant along the b- and c-axes at the magnetic transition temperature. In addition, the large magnetocapacitance effect was observed near above the transition temperature: Δ∊c(Hb)/∊c(0) ≡ [∊c(Hb) - ∊c(0)]/∊c(0) reaches over 50 % at 68 K.

13 citations

Journal ArticleDOI
TL;DR: In this paper, the steplike magnetocapacitance effect of one-dimensional spin frustrated compound Ca(3)Co(2)O(6) was investigated.
Abstract: The dielectric relaxation and magnetocapacitance effect of one-dimensional spin frustrated compound Ca(3)Co(2)O(6) are investigated. The steplike magnetocapacitance effect is observed and one to one corresponds to the steplike magnetization. We explain this phenomenon from the spin configuration dependent dielectric response. The simulation results using the Monte Carlo method are in good agreement with experimental data at low temperature. The close correspondence between the magnetic and dielectric properties indicates that the coupling is the intrinsic character of Ca(3)Co(2)O. The steplike magnetocapacitance effect may find potential applications in data storage and sensors. (C) 2008 American Institute of Physics.

13 citations


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