Controlling the nonreciprocity of spin-wave propagation is crucial for various magnonics applications, however, it still poses a significant challenge. In a joint theoretical and experimental effort, we demonstrate such capability with pronounced tunability. Through modifying the exchange spring structures in SmCo/Fe bilayers, we show that the nonreciprocity can be continuously tailored in a wide range, similar to a system with a tunable Dzyaloshinskii-Moriya interaction from $-0.36$ to $-5.43\mathrm{mJ}/{\mathrm{m}}^2$, a value exceeding most reported ones in heavy metal/ferromagnet bilayers. Our findings create a tunable platform for magnonic devices, enhancing their potential in next-generation technologies.

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• Magnetism
• Spin waves
• Spintronics
• Magnetic multilayers
• Brillouin scattering & spectroscopy
• Magnetization measurements