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: Monitoring the changes in capacitance that occur when a magnetic field is applied in each of three orthogonal directions finds that magnetocapacitance effects, consistent with P( 2) M(2) coupling, are strongest when fields are applied in the plane of the single crystal sheet investigated.
Abstract: The coupling between magnetization and polarization in a room temperature multiferroic (Pb(Zr,Ti)O3 -Pb(Fe,Ta)O3 ) is explored by monitoring the changes in capacitance that occur when a magnetic field is applied in each of three orthogonal directions. Magnetocapacitance effects, consistent with P(2) M(2) coupling, are strongest when fields are applied in the plane of the single crystal sheet investigated.
58 citations
TL;DR: A room temperature magnetocapacitance was found to originate from induced charge at the bilayer interface which can be manipulated by varying the thickness of BFO to obtain higher ME coupling coefficient.
Abstract: Bilayer thin films of BiFeO3–BaTiO3 at different thicknesses of BiFeO3 were prepared by RF-magnetron sputtering technique. A pure phase polycrystalline growth of thin films was confirmed from XRD results. Significantly improved ferroelectric polarization (2Pr ∼ 30 μC/cm2) and magnetic moment (Ms ∼ 33 emu/cc) were observed at room temperature. Effect of ferroelectric polarization on current conduction across the interface has been explored. Accumulation and depletion of charges at the bilayer interface were analyzed by current–voltage measurements which were further confirmed from hysteretic dynamic resistance and capacitance voltage profiles. Magnetoelectric coupling due to induced charges at grain boundaries of bilayer interface was further investigated by room temperature magnetocapacitance analysis. A room temperature magnetocapacitance was found to originate from induced charge at the bilayer interface which can be manipulated by varying the thickness of BFO to obtain higher ME coupling coefficient. D...
58 citations
TL;DR: In this paper, a class of hybrid composites (x)Ni0.75Zn0.25Fe2O4?(1???x)Ba(Ti 0.85Zr 0.15)O 3 synthesized via a solid state reaction method is investigated.
Abstract: A class of hybrid composites (x)Ni0.75Zn0.25Fe2O4?(1???x)Ba(Ti 0.85Zr 0.15)O 3 (for x variations 0, 0.20, 0.30 and 0.40) synthesized via a solid state reaction method is investigated. The structural analysis was carried out using an x-ray diffraction graph which reveals a mixed phase of the hybrid composites with spinel phase for ferrite component and perovskite phase for the ferroelectric component. The microstructural analysis and grain size determination is carried out using a field emission scanning electron microscope (FESEM). The relative dielectric constant with frequency variation (in the range of 100?Hz?1?MHz) and temperature at three fixed frequencies (100?Hz, 1?KHz and 10?KHz) is studied. The magnetic properties such as saturation magnetization (Ms ) and magnetic moment (?B) are calculated from the magnetic hysteresis loops obtained using a vibrating sample magnetometer (VSM). The value of remnant polarization for pure BZT is found to be 6.18??C?cm?2 and as the content of ferrite phase is increased up to 40?mol%, this value decreases. The magnetoelectric effect is studied using magnetocapacitance which takes a maximum value for 40?mol% addition of ferrite.
57 citations
TL;DR: The spinel NiCr$_2$O$_4$ was characterized using dielectric and high magnetic field measurements as discussed by the authors, and the trends in the magnetodielectric response fall into three clear temperature regimes corresponding to known magnetic and structural transitions.
Abstract: The spinel NiCr$_2$O$_4$ is characterized using dielectric and high magnetic field measurements. The trends in the magnetodielectric response fall into three clear temperature regimes corresponding to known magnetic and structural transitions. Above 65\,K, weak magnetic field dependence of the dielectric constant is observed with no hysteresis. When 30\,K\,$\leq\,T\,\leq$\,65\,K, a strong dependence of the dielectric constant on the magnetic field is observed and hysteresis develops resulting in so called butterfly loops. Below 30\,K, magnetodielectric hysteresis is enhanced. Magnetodielectric hysteresis mirrors magnetic hysteresis suggesting that spin-spin interactions are the mechanism for the magnetoelectric effect in NiCr$_2$O$_4$. At high fields however, the magnetization continues to increase while the dielectric constant saturates. Magnetodielectric measurements of NiCr$_2$O$_4$ suggest an additional, previously unobserved transition at 20\,K. Subtle changes in magnetism and structure suggest that this 20\,K anomaly corresponds to the completion of ferrimagnetic ordering and the spin driven structural distortion. We demonstrate that magnetocapacitance is a sensitive probe of magnetostructural distortion.
56 citations
TL;DR: In this paper, a solid state reaction method was used to prepare (1 − x )[0.65BaTiO 3 −0.35Bi 0.5 Na 0.20] composite.
55 citations