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.
Received: 12 February 2003
Revised: 10 April 2003
Accepted manuscript online:
PACS:
75.30.Kz
(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
(Magnetization curves, hysteresis, Barkhausen and related effects)
Fund: 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
Cite this article:
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) Large magnetic entropy change and magnetic properties in La(Fe1-xMnx)11.7Si1.3Hy compounds 2003 Chinese Physics 12 911
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