Magnetic, structural and atomic ordering insight of metamagnetic shape memory alloys
Ni-Mn-Co-X-based Heusler alloys (X=Sn, Ga), a family of metamagentic MSMAs(MetaMSMAs), have been reported to have martensitic transformation (MT) close to room temperature affected by slight changes in the composition. Previous works done in our laboratory on Ni-Mn-Sn alloys have shown that it undergoes a paramagnetic-ferromagnetic phase transition in the MT. Precisely, Ni-Mn-Co-Sn Heusler alloys have been reported to have MT around room temperature, which is promising for solid-state refrigeration applications. For a full understanding of the underlying mechanisms leading to the optimized properties of MetaMSMAs maximizing the MCE on them, the study of the influence of post-spun heat treatments on the structure and atomic order in MetaMSMAs is crucial. Physical properties as magnetization, value of the transformation temperature and hysteresis are atomic ordering dependent, which can be tuned via adequate heat treatments. Within this context, we propose to carry out a neutron powder diffraction study with the goal of elucidating the role of the atomic site occupancies and the effect of heat treatments in the magnetic and structural behaviour of the alloy series.
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PORRO AZPIAZU Jose Maria; PETRENKO Viktor; RODRIGUEZ CRESPO Bosco; RODRIGUEZ VELAMAZAN Jose Alberto and Salazar, D. (2021). Magnetic, structural and atomic ordering insight of metamagnetic shape memory alloys. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2804
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