A polarity-switching magnetic diode provides a method of gating or “rectifying” N and S polarized flux contained within the closed-loop flux circuit of a magnetic flux element. Gaps separate the opposing magnetic polarities, and strategically placed control coils are disposed to break the magnetic circuit in at least two places upon electrical activation of the device—forming high density flux zones of opposite polarity. Switching the control coil's magnetic flux flow allows for the high density flux zones to alternate N and S polarity.