中国物理B ›› 2010, Vol. 19 ›› Issue (4): 47502-047502.doi: 10.1088/1674-1056/19/4/047502

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Order of magnetic transition and large magnetocaloric effect in Er3Co*

赵金良1, 胡凤霞1, 孙继荣1, 沈保根1, 吴剑峰2, 沈俊3   

  1. (1)State Key Laboratory of Magnetism, Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; (2)Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190 China; (3)Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190 China;State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2010-01-03 出版日期:2010-04-15 发布日期:2010-04-15
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No.~2006CB601101), the National Natural Science Foundation of China (Grant No.~50731007) and the Knowledge Innovation Project of the Chinese Academy of Sciences.

Order of magnetic transition and large magnetocaloric effect in Er3Co*

Shen Jun(沈俊)a)b)† , Zhao Jin-Liang(赵金良)b), Hu Feng-Xia(胡凤霞)b), Wu Jian-Feng(吴剑峰)a), Sun Ji-Rong(孙继荣)b), and Shen Bao-Gen(沈保根)b)   

  1. a Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190 China; b State Key Laboratory of Magnetism, Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2010-01-03 Online:2010-04-15 Published:2010-04-15
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No.~2006CB601101), the National Natural Science Foundation of China (Grant No.~50731007) and the Knowledge Innovation Project of the Chinese Academy of Sciences.

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摘要： We have studied the magnetic and magnetocaloric properties of the Er3Co compound, which undergoes ferromagnetic ordering below the Curie temperature $T_{\rm C}=13$~K. It is found by fitting the isothermal magnetization curves that the Landau model is appropriate to describe the Er3Co compound. The giant magnetocaloric effect (MCE) without hysteresis loss around $T_{\rm C}$ is found to result from the second-order ferromagnetic-to-paramagnetic transition. The maximal value of magnetic entropy change is 24.5~J/kg$\cdot$K with a refrigerant capacity (RC) value of 476~J/kg for a field change of 0--5~T. Large reversible MEC and RC indicate the potentiality of Er3Co as a candidate magnetic refrigerant at low temperatures.

Abstract: We have studied the magnetic and magnetocaloric properties of the Er3Co compound, which undergoes ferromagnetic ordering below the Curie temperature $T_{\rm C}=13$ K. It is found by fitting the isothermal magnetization curves that the Landau model is appropriate to describe the Er3Co compound. The giant magnetocaloric effect (MCE) without hysteresis loss around $T_{\rm C}$ is found to result from the second-order ferromagnetic-to-paramagnetic transition. The maximal value of magnetic entropy change is 24.5 J/kg$\cdot$K with a refrigerant capacity (RC) value of 476 J/kg for a field change of 0--5 T. Large reversible MEC and RC indicate the potentiality of Er3Co as a candidate magnetic refrigerant at low temperatures.

Key words: Er3Co compound, magnetocaloric effect, magnetic transition

中图分类号:  (Magnetocaloric effect, magnetic cooling)

  • 75.30.Sg
75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)) 75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects) 75.50.Cc (Other ferromagnetic metals and alloys) 75.20.En (Metals and alloys) 75.10.-b (General theory and models of magnetic ordering)