We report on the investigation of spin-wave propagation in a micro-structured Co2Mn0.6Fe0.4Si (CMFS) Heusler waveguide. The reduced magnetic losses of this compound compared to the commonly used Ni81Fe19 allow for the observation of spin-wave propagation over distances as high as 75 m via Brillouin light scattering (BLS) microscopy. In the linear regime, a maximum decay length of 16.7 m of the spin-wave amplitude was found. The coherence length of the observed spin-wave modes was estimated to be at least 16 m via phase-resolved BLS techniques.
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