Effect of boron on the martensitic transformation and magnetic properties of Ni50Mn36.5Sb13.5−xBx alloys

Influence of boron addition on the microstructure, structural and magnetic properties of Ni53.5Mn26.0Ga20.5 alloy

“…The saturation magnetization at 5 K decreased by 20% for the alloy with x ¼ 0.25 and is attributed to a decrease in the lattice parameters causing a reduction in MneMn distance. Similar trend in T M and T C has been observed on substitution of B for Sb in Ni 50 Mn 36.5 Sb 13.5Àx B x system [21]. The reduction in T M discussed above on substitution of B for Mn in Ni 2 Mn 1Àx B x Ga system follows the general trend reported in literature that T M increases with an increase in electron concentration (e/a).…”

Structural and magnetic properties of Cu50Mn25Al25−Ga Heusler alloys

“…Thus, this increase in the lattice constant reduces the ferromagnetic coupling of Cu 50 Mn 25 Al 25 À x Ga x alloy system leading to a decrease in the magnetization. Such an observation has also been reported in other alloy systems [32][33][34][35][36]. Also, it is well known that Ga 3 þ is normally substituted in isovalent state vis-a-vis that of Al 3 þ [37].…”

“…Cu 2 MnAl, has been extensively studied during the past years due to their main advantages with respect to other halfmetallic systems such as structural similarity with the binary semiconductors and predicted perfect spin polarization at the Fermi level as well as high Curie temperature [9,12]. The number of substitution studies has been made in Heusler alloys to study its effect on the magnetic properties [13][14][15][16][17][18][19]. The effects of offstoichiometry in Cu 2 MnAl, by various partial replacements have been studied [20][21][22][23].…”

MAGNETOCALORIC EFFECT AROUND CURIE TEMPERATURE IN Ni50-x CuxMn38Sn12B3 SHAPE MEMORY RIBBONS

“…In the present study, the magnetization was increased by substituting Cu for Ni, see figure 1. Magnetic properties of Heusler alloys are very sensitive to the structural disorder and strongly depends on the exchange interaction between Mn-Mn atoms [28] because the contribution of the magnetic moments of Ni atoms to the total magnetic moment in Ni-Mn-X (X=Sn, Sb, In) alloys is quite low [29,30]. The exchange interaction determines whether the magnetic order is ferromagnetic or antiferromagnetic.…”