Abstract
A theoretical investigation on capacitive properties of Fe/MgO/Fe trilayers is presented where there is a dc coupling between the two conductors. It is discussed that capacities of the nanoscale metal/insulator/metal contacts are mainly determined by the electronic charge screening at surfaces of their electrodes. The interface effects are simulated using fixed spin moment calculations. In order to have a comparison between the capacities for the parallel and antiparallel alignments of the trilayer, it is assumed that the charge induction across the junction occurs in two independent channels corresponding to the up- and down-spin electrons. The calculations give a larger capacitance for the antiparallel alignment of the electrodes, even though the stable phase of the tunnel junction in the absence of any externally applied magnetic field is calculated to be ferromagnetic.
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