Formation of precipitates in off-stoichiometric Ni-Mn-Sn Heusler alloys probed through the induced Sn-moment.
Benedikt EggertAslı ÇakırDamian GünzingNicolas JostenFranziska ScheibelRichard A BrandMichael FarleMehmet AcetHeiko WendeKatharina OllefsPublished in: RSC advances (2023)
The shell-ferromagnetic effect originates from the segregation process in off-stoichiometric Ni-Mn-based Heusler alloys. In this work, we investigate the precipitation process of L2 1 -ordered Ni 2 MnSn and L1 0 -ordered NiMn in off-stoichiometric Ni 50 Mn 45 Sn 5 during temper annealing, by X-ray diffraction (XRD) and 119 Sn Mössbauer spectroscopy. While XRD probes long-range ordering of the lattice structure, Mössbauer spectroscopy probes nearest-neighbour interactions, reflected in the induced Sn magnetic moment. As shown in this work, the induced magnetic Sn moment can be used as a detector for microscopic structural changes and is, therefore, a powerful tool for investigating the formation of nano-precipitates. Similar research can be performed in the future, for example, on different pinning type magnets like Sm-Co or Nd-Fe-B.
Keyphrases
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- tandem mass spectrometry
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