Between the charged plates of a capacitor there is:

A capacitor is constructed using two conductive plates separated by an insulating material known as a dielectric. When a voltage is applied across the capacitor, an imbalance of charge builds up on the plates, creating an electrostatic field (also known as an electric field) across the gap. This field is the specific mechanism by which the capacitor stores its energy. It is important to remember that the insulating dielectric prevents the actual flow of electrons across the gap, so there is no electric current or "cloud of electrons" between the plates. Additionally, a magnetic field is characteristic of an inductor or a current-carrying wire, not the static electrical charge stored within a capacitor.