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Title: Magnetic properties of Ni 40+xMn 39-xSn 21 (x = 0, 2, 4, 6 and 8 at.%) Heusler alloys

The low electron concentration region (e/a < 7.75) of the magnetic phase diagram of the off-stoichiometric Ni–Mn–Sn Heusler alloys was investigated in detail by DSC and magnetization measurements of the Ni 40+xMn 39-xSn 21(x = 0, 2, 4, 6 and 8 at.%) alloys. The alloys show a stable austenitic phase without any martensitic transformation down to 5 K even after heat treatment. The Curie temperature exhibits a broad maximum over a large composition range. The evolution of the magnetic moment with the electron concentration fits the data of previous studies and confirms the peak-like dependence in the extended range of e/a values predicted by ab initio calculations. Finally, the explored part of the moment versus e/a curve can be explained in terms of a localized magnetic moment model and full atomic order in the alloys.
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Publication Date:
OSTI Identifier:
Report Number(s):
IS-J 8264
Journal ID: ISSN 0925-8388
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Alloys and Compounds; Journal Volume: 594; Journal Issue: C
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
36 MATERIALS SCIENCE; Ni–Mn–Sn; Metamagnetic shape memory alloys; Electron concentration; Magnetic moment