中国物理B ›› 2007, Vol. 16 ›› Issue (12): 3843-3847.doi: 10.1088/1009-1963/16/12/048

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Magnetic properties and magnetocaloric effect in TbCo2-xFex compounds

邹君鼎, 沈保根, 孙继荣   

  1. State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • 出版日期:2007-12-20 发布日期:2007-12-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No~50571112) and the National Basic Research Program of China (Grant No~2006CB601101).

Magnetic properties and magnetocaloric effect in TbCo2-xFex compounds

Zou Jun-Ding(邹君鼎)† , Shen Bao-Gen(沈保根), and Sun Ji-Rong(孙继荣)   

  1. State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Online:2007-12-20 Published:2007-12-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No~50571112) and the National Basic Research Program of China (Grant No~2006CB601101).

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摘要： Magnetic properties and magnetocaloric effect in TbCo$_{2 - x}$Fe$_{x}$ compounds are studied by DC magnetic measurement. With increasing content of Fe, the entropy changes decrease slightly, though the Curie temperature is tuned from 231 K ($x=0$) to 303 K ($x=0.1$). Magnetic entropies of TbCo$_{2}$ compound are calculated by using mean field approximation (MFA). Results estimated by using Maxwell relation are consistent with that of MFA calculation. It is shown that the entropy changes are mainly derived from the magnetic entropy changes. The lattice has almost no contribution to the entropy change in the vicinity of phase transition.

关键词: magnetocaloric effect, mean field approximation, metamagnetic transition

Abstract: Magnetic properties and magnetocaloric effect in TbCo$_{2 - x}$Fe$_{x}$ compounds are studied by DC magnetic measurement. With increasing content of Fe, the entropy changes decrease slightly, though the Curie temperature is tuned from 231 K ($x=0$) to 303 K ($x=0.1$). Magnetic entropies of TbCo$_{2}$ compound are calculated by using mean field approximation (MFA). Results estimated by using Maxwell relation are consistent with that of MFA calculation. It is shown that the entropy changes are mainly derived from the magnetic entropy changes. The lattice has almost no contribution to the entropy change in the vicinity of phase transition.

Key words: magnetocaloric effect, mean field approximation, metamagnetic transition

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

  • 75.30.Sg
65.40.G- (Other thermodynamical quantities) 75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)) 75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects)