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We propose and develop a concept of magnonic logic gates enabling reversiblecomputing. The gates consist of passive elements: waveguides, cross-junctionsand phase shifters. Logical 0 and 1 are encoded in the relative phase of thepropagating spin wave packets (0 or {\pi}). The gates contain several possibletrajectories for each packet to propagate from the input to the output.Re-direction of the spin wave packets among the possible trajectories is due tothe interference in the magnetic cross-junctions. Two wave packets coming tothe cross-junction in-phase propagate through the junction without reflection.Two packets coming out-of-phase to the junction are completely reflected back.The operation of the cross-junction is illustrated by numerical modeling. Weestimate the power dissipation in the proposed circuits and the feasibility ofcascading such magnetic devices in large circuits. The proposed gates maypotentially provide a route to magnetic reversible logic circuitry with powerdissipation less than kT per operation.

On the Possibility of Reversible Magnonic Logic Gates