Eggert Benedikt, Çakır Aslı, Günzing Damian, Josten Nicolas, Scheibel Franziska, Brand Richard A, Farle Michael, Acet Mehmet, Wende Heiko, Ollefs Katharina
Faculty of Physics, Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen Lotharstr. 1 47057 Duisburg Germany
Department of Metallurgical and Materials Engineering, Muğla Sıtkı Koçman University 48000 Mugla Turkey.
RSC Adv. 2023 Jun 15;13(27):18217-18222. doi: 10.1039/d3ra01420g.
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-ordered NiMnSn and L1-ordered NiMn in off-stoichiometric NiMnSn during temper annealing, by X-ray diffraction (XRD) and 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.
壳层铁磁效应源于非化学计量比的镍锰基赫斯勒合金中的偏析过程。在本工作中，我们通过X射线衍射（XRD）和锡穆斯堡尔谱，研究了非化学计量比的NiMnSn在回火退火过程中L2有序的NiMnSn和L1有序的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，这反映在诱导的锡磁矩上。如本工作所示，诱导的磁性锡矩可作为微观结构变化的探测器，因此是研究纳米析出物形成的有力工具。未来可以进行类似的研究，例如，针对不同的钉扎型磁体，如钐钴或钕铁硼。
