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Chin. Phys. B, 2010, Vol. 19(9): 097501    DOI: 10.1088/1674-1056/19/9/097501

Magnetic hysteresis and refrigeration capacity of Ni–Mn–Ga alloys near Martensitic transformation

Wu Guang-Henga, Fu Binb, Long Yib, Duan Jing-Fangb, Wang Chao-Lunb, Chang Yong-Qinb, Ye Rong-Changb
a Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China ; b School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract  This paper studies the magnetic hysteresis and refrigeration capacity of Ni–Mn–Ga alloys in detail during heating and cooling isothermal magnetisation processes. The Ni–Mn–Ga alloys show larger magnetic hysteresis when they transform from austenite to martensite, but smaller magnetic hysteresis when they transform from martensite to austenite. This behaviour is independent of either the pure Ni–Mn–Ga alloys or the alloys doped with other elements. Because of the existence of the magnetic hysteresis, the relation between the magnetic entropy change and refrigeration capacity is not simply linear. For practical consideration, magnetocaloric effect of Ni–Mn–Ga alloys should be investigated both on cooling and heating processes.
Keywords:  magnetic refrigeration capacity      first-order magnetic transition      Heusler alloys  
Received:  11 February 2010      Revised:  25 February 2010      Published:  15 September 2010
PACS:  7530S  
Fund: Project supported by the National Basic Research Program of China (Grant No.2006CB601101), the National High Technology Research and Development Program of China (Grant No.2007AA03Z440), and the National Natural Science Foundation of China (Grant No.50731007).

Cite this article: 

Fu Bin, Long Yi, Duan Jing-Fang, Wang Chao-Lun, Chang Yong-Qin, Ye Rong-Chang, Wu Guang-Heng Magnetic hysteresis and refrigeration capacity of Ni–Mn–Ga alloys near Martensitic transformation 2010 Chin. Phys. B 19 097501

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