Dataset for "Magneto-optical signal from Co2Mn-based Heusler thin films in MOKE and BLS"

This is the data set associated with the preprint "Magneto-optical signal from Co2Mn-based Heusler thin films in MOKE and BLS" (arXiv:2608.07052). --- Abstract: Co2Mn-based Heusler compounds offer a versatile, composition-tunable platform for magnonics and spintronics. Among them, the half-metallic Co2MnSi is of particular interest for magnonics owing to its ultralow Gilbert damping, yet its weak magneto-optical response in the visible challenges optical probing such as Brillouin light scattering (BLS). We study the magneto-optical response of epitaxial Co2MnX films (X = {AlxSi1-x, GaxGe1-x, Sn}) by magneto-optical Kerr effect (MOKE) spectroscopy and BLS. Angle-resolved MOKE resolves a significant, wavelength-dependent quadratic MOKE (QMOKE) only for Co2MnSi, whereas Co2MnAl, Co2MnGa and Co2MnSn respond dominantly linearly. Comparing BLS intensities of thermal magnons at two wavelengths, Co2MnSi gives the weakest signal at 532nm yet among the strongest at 457nm, tracking the spectral dependence of its Kerr angle. These results emphasise the relation between the two magneto-optical techniques, guiding the choice of probing wavelength for Co2Mn-based Heusler compounds.