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This paper presents a comparative study of the critical exponents (β, γ, δ), the critical temperatura Tc, the magnetic anisotropy, the Hall and magneto-caloric effects, and the magnetic interactions for the alloys [(Fe50Co50)75B20Si5]96Nb4, Fe65.5Cr8Cu1Nb3Si13.5B9, and Mn50Ni36Fe5Sn9 prepared by using melt spinning. The above critical parameters and the magneto-caloric effect were determined from magnetization measurements. The values (β, δ, TC) for [(Fe50Co50)75B20Si5]96Nb4 and Fe65.5Cr8Cu1Nb3Si13.5B9 were (0.34 ± 0.09; 4.50 ± 0.45; 660 ± 30 K) and (0.52 ± 0.04; 3.62 ± 0.06; 481 ± 2 K), respectively, and for Mn50Ni36Fe5Sn9 it was (0.51 ± 0.03; 2.97 ± 0.03; 318 ± 8 K). The Hall resistivity vs. H curves exhibit an HS inflection field below which ordinary and extraordinary Hall effects are observed. Above HS, the ordinary Hall effect predominates and the extraordinary one is no longer seen. The HS values for [(Fe50Co50)75B20Si5]96Nb4 and Fe65.5Cr8Cu1Nb3Si13.5B9 were 8 kOe and 4.42 kOe, respectively, and for Mn50Ni36Fe5Sn9, 1.84 kOe. The number of charge carriers, nc, was determined for H > HS, and its value for Fe65.5Cr8Cu1Nb3Si13.5B9 and Mn50Ni36Fe5Sn9 was 2.71 x 1019 cm-3 and 129 x 1019 cm-3, respectively. The change in magnetic entropy and relative cooling capacity due to a field change of 10 kOe were evaluated and their maximum values close to TC for [(Fe50Co50)75B20Si5]96Nb4 and Fe65.5Cr8Cu1Nb3Si13.5B9 were (0.6; 0.75) Jkg-1K-1 and (57.4; 56.6) Jkg-1, respectively, and for Mn50Ni36Fe5Sn9, 0.5 Jkg-1K-1 and 25.1 Jkg-1, respectively. The possible effects of the exchange and spin-orbit interactions on the above results were also analyzed.
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