通过感应Sn磁矩探究非化学计量比Ni-Mn-Sn Heusler合金中核壳析出物的形成
Formation of Core-Shell Precipitates in off-stochiometric Ni-Mn-Sn Heusler alloys probed through the induced Sn-moment
AI总结：
本研究利用XRD和穆斯堡尔谱探究非化学计量比Ni-Mn-Sn合金退火时的析出过程，证明感应Sn磁矩可作为探测微观结构变化和研究纳米析出物形成的有效工具。
摘要：
壳层铁磁效应源于非化学计量比Ni-Mn基Heusler合金的偏析过程。本研究利用X射线衍射（XRD）和$^{119}$Sn穆斯堡尔谱学，探究了非化学计量比Ni$_{50}$Mn$_{45}$Sn$_{5}$在回火退火过程中L2$_1$有序Ni$_2$MnSn和L1$_0$有序NiMn的析出过程。XRD探测晶格结构的长程有序，而穆斯堡尔谱探测最近邻相互作用，反映在感应Sn磁矩上。研究表明，感应Sn磁矩可作为微观结构变化的探测器，是研究纳米析出物形成的有效工具。未来可开展类似研究，如Sm-Co或Nd-Fe-B等不同钉扎型磁体。
英文摘要：
The Shell-ferromagnetic effect originates from the segregation process in off-stochiometric Ni-Mn-based Heusler. In this work, we investigate the precipitation process of L2$_1$-ordered Ni$_2$MnSn and L1$_0$-ordered NiMn in off-stochiometric 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.
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