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Home > Issues > Volume 10 (2005) > No.4(pp.133-170)The Large Magnetocaloric Effect in Amorphous Fe80-sMnsZr10(x = 4,6,8,10) Alloys
Journal of Magnetics, Volume 10, Number 4, 31 Dec 2005, Pages 142-144
Y. M. Moon* 
(Department of Physics, Chungbuk National University), S. G Min(Department of Physics, Chungbuk National University), K. S. Kim(Department of Physics, Chungbuk National University), S. C. Yu(Department of Physics, Chungbuk National University), Y. C. Kim(Division of Materials Science and Engineering, Korea Institute of Science and Technology), K. Y. Kim(Division of Materials Science and Engineering, Korea Institute of Science and Technology)
(Department of Physics, Chungbuk National University), S. G Min(Department of Physics, Chungbuk National University), K. S. Kim(Department of Physics, Chungbuk National University), S. C. Yu(Department of Physics, Chungbuk National University), Y. C. Kim(Division of Materials Science and Engineering, Korea Institute of Science and Technology), K. Y. Kim(Division of Materials Science and Engineering, Korea Institute of Science and Technology)
Abstract
The Magnetization behaviour has been measured for amorphous Fe80-sMnsZr10(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 Tc where the mean magnetic moment of the superparamagnetic spin clusters decreased with increasing temperature. A large magnetic entropy change,ΔSM, which is calculated from H vs M curves associated with the ferromagnetic-paramagnetic transitions in amorphous, has been observed. With Mn concentration increasing, ΔSM decreases 1.04, 0.95, 0.87 J/kg K at 222, 210, 195 K (the Curie temperature), respectively.
Keywords: magnetocaloric effect; isothermal magnetization; magnetic refrigeration
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