Three possible mechanisms of capacitance enhancement under magnetic field: charge density gradient modulation, electron gas excitation and oscillatory magnetization- polarization coupling

TL;DR

This paper analyzes three distinct mechanisms—charge density gradient modulation, electron gas excitation, and oscillatory magnetization-polarization coupling—that can enhance capacitance under a magnetic field, offering new avenues for tunable dielectric materials.

Contribution

It introduces and theoretically derives three novel mechanisms for magnetic field-induced capacitance enhancement in dielectric materials.

Findings

Charge density gradient can augment magnetocapacitance.

Magnetic fields can excite electron gas to increase capacitance.

Capacitance oscillates due to magnetization-polarization coupling.

Abstract

Three mechanisms of capacitance enhance-ment by a magnetic field have been analyz-ed. Through semiclassical description of charge movement under a magnetic field, it can be shown that the charge density gradient, a term coupled with magnetic field strength, could be used to augment the magnetocapacitance. Also a magnetic field could enhance capacitance on the polarized metallic material surface due to the electron gas excitation. Finally, a magnetic field could produce oscillation in the capacitance when relating the polarization with the magnetization through the modification of standard free energy model. By deriving these three mechanisms, it can be seen that three approaches are of potential for exploring tunable dielectric materials.