中国物理B ›› 2003, Vol. 12 ›› Issue (8): 911-914.doi: 10.1088/1009-1963/12/8/317

• • 上一篇    

Large magnetic entropy change and magnetic properties in La(Fe1-xMnx11.7Si1.3Hy compounds

王芳, 陈远富, 王光军, 孙继荣, 沈保根   

  1. State Key Laboratory of Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
  • 收稿日期:2003-02-12 修回日期:2003-04-10 出版日期:2003-08-16 发布日期:2005-03-16
  • 基金资助:
    Project supported by the State Key Programme of Basic Research of China (973) (Grant No G 1998061303), by the National High Technology Development Programme of China (Grant No. 2002A A324010), and by the National Natural Science Foundation of China (Grant

Large magnetic entropy change and magnetic properties in La(Fe1-xMnx)11.7Si1.3Hy compounds

Wang Fang (王芳), Chen Yuan-Fu (陈远富), Wang Guang-Jun (王光军), Sun Ji-Rong (孙继荣), Shen Bao-Gen (沈保根)   

  1. State Key Laboratory of Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2003-02-12 Revised:2003-04-10 Online:2003-08-16 Published:2005-03-16
  • Supported by:
    Project supported by the State Key Programme of Basic Research of China (973) (Grant No G 1998061303), by the National High Technology Development Programme of China (Grant No. 2002A A324010), and by the National Natural Science Foundation of China (Grant

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摘要： Magnetic properties and magnetic entropy change in La(Fe_{1-x}Mn_x)_{11.7}Si_{1.3}H_y compounds have been investigated. A significant increase of the Curie temperature T_C and a small increase of the saturation magnetizations μ_S have been observed after the introduction of interstitial H, which caused a slight volume expansion. The first-order field-induced itinerant-electron metamagnetic (IEM) transition remains and brings about a large magnetic entropy change around room temperatures for the compounds. The maximal magnetic entropy change is about 23.4, 17.7 and 15.9J/kg·K under a magnetic field change from 0 to 5T for x=0.01, 0.02 and 0.03, respectively. Therefore, the compounds appear to be potential candidates for magnetic refrigerants around room temperatures.

Abstract: Magnetic properties and magnetic entropy change in La(Fe$_{1-x}$Mn$_x$)$_{11.7}$Si$_{1.3}$H$_y$ compounds have been investigated. A significant increase of the Curie temperature $T_{\rm C}$ and a small increase of the saturation magnetizations $\mu_{\rm S}$ have been observed after the introduction of interstitial H, which caused a slight volume expansion. The first-order field-induced itinerant-electron metamagnetic (IEM) transition remains and brings about a large magnetic entropy change around room temperatures for the compounds. The maximal magnetic entropy change is about 23.4, 17.7 and 15.9J/kg·K under a magnetic field change from 0 to 5T for x=0.01, 0.02 and 0.03, respectively. Therefore, the compounds appear to be potential candidates for magnetic refrigerants around room temperatures.

Key words: magnetic entropy change, itinerant-electron metamagnetic transition

中图分类号:  (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))

  • 75.30.Kz
75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects)