Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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The Large Magnetocaloric Effect in Amorphous Fe80-xMnxZr10 (x = 4,6,8,10) Alloys

  • Moon, Y.M. (Department of Physics, Chungbuk National University) ;
  • Min, S.G (Department of Physics, Chungbuk National University) ;
  • Kim, K.S. (Department of Physics, Chungbuk National University) ;
  • Yu, S.C. (Department of Physics, Chungbuk National University) ;
  • Kim, Y.C. (Division of Materials Science and Engineering, Korea Institute of Science and Technology) ;
  • Kim, K.Y. (Division of Materials Science and Engineering, Korea Institute of Science and Technology)
  • Published : 2005.12.01
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Abstract

The Magnetization behaviour has been measured for amorphous $Fe_{80-x}Mn_xZr_{10}$ (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 $T_c$ where the mean magnetic moment of the superparamagnetic spin clusters decreased with increasing temperature. A large magnetic entropy change, ${\Delta}S_M$, which is calculated from H vs M curves associated with the ferromagnetic-paramagnetic transitions in amorphous, has been observed. With Mn concentration increasing, ${\Delta}S_M$ decreases 1.04, 0.95, 0.87 J/kg K at 222, 210, 195 K (the Curie temperature), respectively.

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References

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