Structure, Magnetocaloric Effect and Critical Behavior of the Fe 60 Co 12 Gd 4 Mo 3 B 21 Amorphous Ribbons.

The aim of the paper was to study the structure, magnetic properties and critical behavior of the Fe 60 Co 12 Gd 4 Mo 3 B 21 alloy. The X-ray diffractometry and the Mössbauer spectroscopy studies confirmed amorphous structure. The analysis of temperature evolution of the exponent n (ΔS M = C·(B max ) n ) and the Arrott plots showed the second order phase transition in investigated material. The analysis of critical behavior was carried out in order to reveal the critical exponents and precise T C value. The ascertained critical exponents were used to determine the theoretical value of the exponent n, which corresponded well with experimental results.