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We investigated the structure-property relationship of Co$_2$MnSi Heuslerthin films upon the irradiation with He$^+$ ions. The variation of the crystalstructure with increasing ion fluence has been probed using nuclear magneticresonance (NMR) and transmission electron microscopy (TEM), and associated withthe corresponding changes of the magnetic behavior. A decrease of both thestructural order and the moment in saturation is observed. Specifically, wedetect a direct transition from a highly $L2_1$-ordered to a fully$A2$-disordered structure type and quantify the evolution of the $A2$structural contribution as a function of ion fluence. Complementary TEManalysis reveals a spatially-resolved distribution of the $L2_1$ and $A2$phases showing that the $A2$ disorder starts at the upper part of the films.The structural degradation in turn leads to a decreasing magnetic moment insaturation in response to the increasing fluence.

Structure-property relationship of Co$_2$MnSi thin films in response to He$^+$ -irradiation