  An electric current controlled spin-wave logic gate based on a
width-modulated dynamic magnonic crystal is realized. The device utilizes a
spin-wave waveguide fabricated from a single-crystal Yttrium Iron Garnet film
and two conducting wires attached to the film surface. Application of electric
currents to the wires provides a means for dynamic control of the effective
geometry of the waveguide and results in a suppression of the magnonic band
gap. The performance of the magnonic crystal as an AND logic gate is
demonstrated.
