A circuit includes at least one negative differential resistance (NDR) device and at least one magnetic device having reversibly variable resistance, wherein the negative differential resistance device and the magnetic device are operatively connected so that changing the resistance of the magnetic device changes the current-voltage response characteristics of the circuit. NDR devices and magnetic devices can be arranged to form multiple value logic (MVL) cells and monostable-bistable transition logic elements (MOBILE), and these logic cells can form the components of a field programmable gate array.