  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.
