Individual site reversal in centro-symmetric matrices by common current excitation

We have proposed an approach for reversing magnetization of individual sites of a 2 by 2 matrix of perpendicularly magnetized dots by common excitation with a spin-polarized current. The spin-polarized current signal is formed of a dc-biased ac part followed by a dc section. In such a matrix, where all the parameters and initial conditions are the same, a spatial and temporal interaction and interference is needed to separate the individual dot dynamics in the phase space. By controlled modulation of the spin-polarized current, the inherent magneto-static interactions provide the possibility of such spatiotemporal interference, leading to a temporally-spaced magnetization switching of different sites of the matrix.