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The Shell-ferromagnetic effect originates from the segregation process inoff-stochiometric Ni-Mn-based Heusler. In this work, we investigate theprecipitation process of L2$_1$-ordered Ni$_2$MnSn and L1$_0$-ordered NiMn inoff-stochiometric Ni$_{50}$Mn$_{45}$Sn$_{5}$ during temper annealing, by X-raydiffraction (XRD) and $^{119}$Sn M\"ossbauer spectroscopy. While XRD probeslong-range ordering of the lattice structure, M\"ossbauer spectroscopy probesnearest-neighbour interactions, reflected in the induced Sn magnetic moment. Asshown in this work, the induced magnetic Sn moment can be used as a detectorfor microscopic structural changes and is, therefore, a powerful tool forinvestigating the formation of nano-precipitates. Similar research can beperformed in the future, for example, on different pinning type magnets likeSm-Co or Nd-Fe-B.

Formation of Core-Shell Precipitates in off-stochiometric Ni-Mn-Sn Heusler alloys probed through the induced Sn-moment