These magnetic particles are not Monopoles. Each particle has a North and a South. When moving, the particles will line up N-S-N-S. There won't be any adjacent particles both having the same pole pointing in the same direction, askance to the flow. So, when a pulse enters a coil, the flux lines will be perpendicular to the coil windings. As the pulse moves towards, then past the center of a coil, the flux will expand, then contract, as seen by the coil. This produces a rising, then falling output from the coil. How this might produce more output than input is a mystery to me. But it would provide a convenient non electronic pulse generating system.