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We report ultra-low intrinsic magnetic damping inCo$_{\text{25}}$Fe$_{\text{75}}$ heterostructures, reaching the low $10^{-4}$regime at room temperature. By using a broadband ferromagnetic resonancetechnique, we extracted the dynamic magnetic properties of severalCo$_{\text{25}}$Fe$_{\text{75}}$-based heterostructures with varyingferromagnetic layer thickness. By estimating the eddy current contribution todamping, measuring radiative damping and spin pumping effects, we found theintrinsic damping of a 26\,nm thick sample to be $$\alpha_{\mathrm{0}} \lesssim3.18\times10^{-4}$. Furthermore, using Brillouin light scattering microscopy wemeasured spin-wave propagation lengths of up to $(21\pm1)\,\mathrm{\mu m}$ in a26 nm thick Co$_{\text{25}}$Fe$_{\text{75}}$ heterostructure at roomtemperature, which is in excellent agreement with the measured damping.

High Spin-Wave Propagation Length Consistent with Low Damping in a Metallic Ferromagnet