Magnetic properties of ferromagnetic shape memory alloys Ni2Mn1 − Fe Ga

Phase Transformation and Magnetic Properties in Ni52FexMn21−xGa27 Alloys

“…But this tendency is reversed by further addition of Fe. Observed increase in T C and decrease in martensitic transformation temperature by addition of Fe agrees with those reported by Kikuchi et al 11) More detailed comparison will be made later.…”

Fe and Co selective substitution in Ni2MnGa: Effect of magnetism on relative phase stability

“…This behaviour is unexpected from the scaling of the martensitic transition temperatures with the electronic concentration. However, our present results agree with those reported in most of the literature [35,39,44]. Interestingly, a similar behaviour has been recently reported in Ni-Mn-Sn alloys: while a decrease of martensitic transition temperatures when increasing e/a has been observed when replacing Mn by Fe [53], an increase of the 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 54].…”

“…Specifically, we studied the effect of Fe addition on the Curie, premartensitic and martensitic transitions and we determined a detailed phase diagram of quaternary Ni-Mn-Ga-Fe alloys for low Fe concentrations [34]. Previously, the study of doping in Ni-Mn-Ga alloys had been focused only on its effect on the martensitic and the ferromagnetic phase transitions [35][36][37][38][39][40][41][42][43][44][45][46]. Here, we extend previous studies by means of investigating the dependence of all transition temperatures (M s , T I , T IM and T C ) on Fe and Co 3d transition elements doping, with concentrations up to ∼ 5% in both cases.…”

Control of Phase Transformation Temperatures by Substituents in Ni-Fe-Ga Ferromagnetic Shape Memory Alloys

“…With increasing Mn content x from 0 to 3, T C slightly increases from 298 K to 308 K, whereas T M S decreases. The present tendency is consistent with that of Kikuchi et al 25) and Tsuchiya et al 26) In their studies, the effect of partial substitution of Mn by Fe in Ni 52 Mn 21Àx Fe x Ga 27 on T C was investigated. For Ni 52 Mn 21Àx Fe x Ga 27 alloy, T C increases with increasing x and then has a maximum around x ¼ 15 mol%.…”

“…Furthermore, it has been reported that T C increases by partial substitution of Cu 23,24) and Mn 25,26) in Ni 2 MnGa alloy. Accordingly, Co, Cu and Mn were selected as substituents in the present study.…”