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The field dependence of the magnetic entropy change can be expressed as  SM Hn. For softmagnetic amorphous alloys n=1 well below the Curie temperature  TC , n=2 in the paramagneticrange, and n 0.75 for T=TC. The first value can be explained with simple arguments, n=2 is aconsequence of the Curie-Weiss law, but n TC  deviates from mean field predictions. From theArrott-Noakes equation of state, a relation between n TC  and the critical exponents has beenobtained, showing remarkable agreement with experimental data  for an example alloy, predictedn=0.72 versus experimental n=0.73 . A master curve behavior for the temperature dependence of SM measured for different maximum fields is proposed

Field dependence of the magnetocaloric effect in materials with a second order phase transition: A master curve for the magnetic entropy change