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We present an analytic and numerical study of the creation of anuni-directional spin-wave emission in ultra-thin ferromagnetic films sandwichedin an asymmetric layer stack. For this we extend the analytical description ofspin waves in spin-wave waveguides by the incorporation of the influence of theinterfacial Dzyaloshinskii-Moriya interaction on the spin-wave propagation. Byexploring the model system Ni$_{81}$Fe$_{19}$/Pt we show that it is possible toachieve an uni-directional spin-wave emission by combining wave-vectorselective excitation sources with the frequency splitting which arises frominterfacial Dzyaloshinskii-Moriya interaction. Hereby we focus on devicefeature sizes and spin-wave wavelengths compatible with state-of-the artexcitation and detection schemes. We demonstrate that the optimum operationconditions for the non-reciprocal emission can be predicted using the presentedanalytical formalism

Creation of uni-directional spin-wave emitters by utilizing interfacial Dzyaloshinskii-Moriya interaction