Magnetocapacitance

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

Magnetic-field-induced hybridization of electron subbands in a coupled double quantum well

Abstract: We employ a magnetocapacitance technique to study the spectrum of the soft two-subband (or double-layer) electron system in a parabolic quantum well with a narrow tunnel barrier at the center. In this system, when unbalanced by gate depletion, two sets of quantum oscillations are observed at temperatures T≳30 mK: one originates from the upper electron subband in the closer-to-the-gate part of the well, and the other indicates the existence of common gaps in the spectrum at integer fillings. For the lowest filling factors υ=1 and υ=2, both the presence of a common gap down to the point of the one-to two-subband transition and their nontrivial magnetic field dependences point to magnetic-field-induced hybridization of electron subbands.

Investigation of incompressible region by magnetocapacitance measurement in quantum Hall plateaux

Abstract: We have measured the capacitance between adjacent edge channels ( C M ) in the GaAs/AlGaAs two-dimensional electron gas in the quantum Hall plateau to investigate the structure of edge channels. The value of C M is mainly determined by the ratio of edge channel width (compressible region) to the separation between them (incompressible region) and the length of the edge channels. However, the energy relaxation between the edge channels reduces the effective length of the adjacent edge channels. Only at ν =3 quantum Hall plateau, it is able to measure C M to investigate the width of incompressible region, since the energy relaxation between the ν =2 and 3 channel is small enough.

Observation of magnetocapacitance in ferromagnetic nanowires

Abstract: The authors have investigated magnetic domain wall induced capacitance variation as a tool for the detection of magnetic reversal in magnetic nanowires for in-plane (NiFe) and out-of-plane (Co/Pd) magnetization configurations. The switching fields in the capacitance measurements match with that of the magnetoresistance measurements in the opposite sense. The origin of the magnetocapacitance has been attributed to magnetoresistance. This magnetocapacitance detection technique can be useful for magnetic domain wall studies.

Magnetodielectric behaviour in

Abstract: We explore magneto-dielectricity in La0.53Ca0.47MnO3 across its paramagnetic (PMI) to ferromagnetic (FMM) isostructural transition at TC ∼ 253K, by magnetic (M), caloric (W), dielectric (e � ), magnetoresistive (MR), and magnetocapacitance (MC) investigations. A skew-broadened first-order transition character is confirmed via heating/cooling hystereses in M(T )and W( T ), with a superheating temperature T ∗∗ next to TC and supercooling temperature T ∗ exhibiting kinetics. Above TC, linearly related MC and MR reflect purely a magnetoresistance effect. Near TC, the high-frequency MC (5Tesla (T)), far exceeds the magneto-losses, and is uncorrelated with dc MR (5T) in the FM-ordered state. The intrinsic magneto-dielectricity manifest below TC and above ∼kHz is traced to an intra-granular Maxwell‐Wagner-type effect at the interface region of PMI‐FMM phase coexistence.