Possible Mechanisms of Capacitance Enhancement under Magnetic Field: Charge Density Gradient Modulation, Electron Gas Excitation and oscillatory Magnetization-Polarization Coupling

Abstract

Possible mechanisms of capacitance enhancement by a magnetic field have been analyzed. 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 mechanisms, it can be seen that these approaches are of potential for exploring tunable dielectric materials.

Keywords:

• Magnetocapacitance
• charge density gradient
• electron gas excitation
• oscillatory magnetization-polarization coupling