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We report on the influence a preferential magnetic vortices motion has on themagnitude of the inverse ac Josephson effect (the appearance of dc currentShapiro steps) and the coherent operation of asymmetrical parallel arrays ofYBaCuO Josephson junctions (JJ) irradiated with microwave (MW) radiation in thepresence of an applied magnetic field B. The preferential direction of motionof the Josephson vortices is due to the asymmetry-induced ratchet effect andhas a dramatic impact: for a particular positive dc bias current I when theflux-flow is robust multiple pronounced Shapiro-steps are observed consistentwith a coherent operation of the array. This suggests an efficientemission/detection of MW in related applications. In contrast, when we reversethe direction of I, the flux-flow is reduced and the Shapiro-steps are stronglysuppressed due to a highly incoherent operation that suggests an inefficientemission/detection of MW. Remarkably, by changing B slightly, the situation isreversed: Shapiro steps are now suppressed for a positive I, while wellpronounced for a reverse current -I. Our results suggest that a preferentialvortex-flow has a very significant impact on the coherent MW operation ofsuperconducting devices consisting of either multiple JJs or a single long JJasymmetrically biased. This is particular relevant in the case of flux-flowoscillators for sub-terahertz integrated-receivers, flux-driven Josephson(travelling-wave) parametric amplifiers, or on-chip superconducting MWgenerators which usually operate at bias currents in the Shapiro step region.

The influence of magnetic vortices motion on the inverse ac Josephson effect in asymmetric arrays