Abstract The magnetization behaviors have been measured for amorphous Fe 90 - x Mn x Zr 10 ( x = 0 , 4 , 6 ) alloys. The Curie temperature is decreased from 243 to 218 K with increasing Mn concentration ( x = 0 –6). The magnetization measurements were conducted at temperatures above the Curie temperature in the paramagnetic region. In all samples, the magnetic properties showed superparamagnetic behavior above T c where the mean magnetic moment of the superparamagnetic spin clusters decreased with increasing temperature. A large magnetic entropy change Δ S M , which is calculated from H vs. M curves associated with the ferromagnetic–paramagnetic transitions in amorphous state, has been observed. The maximum of Δ S M was found to appear in the vicinity of the Curie temperature of the amorphous phase. The value is 2.96, 2.51 and 2.29 J/kg K at x = 0 , 4 and 6, respectively.