Full variation of site substitution in Ni-Mn-Ga by ferromagnetic transition metals

0547685 - FZÚ 2022 RIV CH eng J - Journal Article
Kopecký, Vít - Rameš, Michal - Veřtát, Petr - Colman, R.H. - Heczko, Oleg
Full variation of site substitution in Ni-Mn-Ga by ferromagnetic transition metals.
Metals. Roč. 11, č. 6 (2021), č. článku 850. E-ISSN 2075-4701
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA ČR GA19-09882S; GA MŠMT(CZ) LM2018096
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : Ni-Mn-Ga * doping * ferromagnetism * transition metals * Heusler alloy
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 2.695, year: 2021
Method of publishing: Open access

Systematic doping by transition elements Fe, Co and Ni on each site of Ni2 MnGa al- loy reveal that in bulk material the increase in martensitic transformation temperature is usually accompanied by the decrease in ferromagnetic Curie temperature, and vice versa. The highest martensitic transformation temperature (571 K) was found for Ni50.0Mn25.4(Ga20.3Ni4.3) with the result of a reduction in Curie temperature by 55 K. The highest Curie point (444 K) was found in alloy (Ni44.9Co5.1)Mn25.1Ga24.9 however, the transition temperature was reduced to 77 K. The depen- dence of transition temperature is better scaled with the Ne/a parameter (number of non-bonding electrons per atom) compared to usual e/a (valence electrons per atom). Ne/a dependence predicts a disappearance of martensitic transformation in (Ni45.3Fe5.3)Mn23.8Ga25.6, in agreement with our experiment. The doping effect of the same element is different for each compositional site.
Permanent Link: http://hdl.handle.net/11104/0323874