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The thermal magnonic spectra of Co$_{2}$Cr$_{0.6}$Fe$_{0.4}$Al (CCFA) andCo$_2$FeAl were investigated using Brillouin light scattering spectroscopy(BLS). For CCFA, the exchange constant A (exchange stiffness D) is found to be0.48 $\mu$erg/cm (203 meV A$^2$), while for Co$_2$FeAl the corresponding valuesof 1.55 $\mu$erg/cm (370 meV A$^2$) were found. The observed asymmetry in theBLS spectra between the Stokes and anti-Stokes frequencies was assigned to aninterplay between the asymmetrical profiles of hybridized Damon-Esbach andperpendicular standing spin-wave modes, combined with the optical sensitivityof the BLS signal to the upper side of the CCFA or Co$_2$FeAl film.

Brillouin light scattering study of Co$_{2}$Cr$_{0.6}$Fe$_{0.4}$Al and Co$_{2}$FeAl Heusler compounds