The large magnetocaloric effect in amorphous Fe80-xMnxZr10(x=4,6,8,10)alloys

Abstract

The Magnetization behaviour has been measured for amorphous Fe90-xMnxZr10 (x=4,6,8,10) alloys. The Curie temperature decreased from 236 K to 195 K with increasing Mn concentration (x=4 to x=10). 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 Tcwhere the mean magnetic moment of the superparamagnetic spin clusters decreased with increasing temperature. A large magnetic entropy change, DSM, which is calculated from H vs M curves associated with the ferromagnetic-paramagnetic transitions in amorphous, has been observed. With Mn concentration increasing, DSM decreases 1.04, 0.95, 0.87 J/kg K at 222, 210, 195 K (the Curie temperature), respectively.