中国物理B ›› 2010, Vol. 19 ›› Issue (9): 97501-097501.doi: 10.1088/1674-1056/19/9/097501

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

吴光恒1, 傅斌2, 龙毅2, 段静芳2, 王超伦2, 常永勤2, 叶荣昌2   

  1. (1)Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China footnotetexths*-.45cmfoyjProject 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).hs*.8mmfootnotesizebfbaselineskip=11pt copyright 2010 Chinese Physical Society and IOP Publishing Ltd footnotetexths*-4mmfosl hfill http://www.iop.org/journals/cpb　 http://cpb.iphy.ac.cn; (2)School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • 收稿日期:2010-02-11 修回日期:2010-02-25 出版日期:2010-09-15 发布日期:2010-09-15
  • 基金资助:
    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.50731

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

Fu Bin(傅斌)a), Long Yi(龙毅)a), Duan Jing-Fang(段静芳)a), Wang Chao-Lun(王超伦)a), Chang Yong-Qin(常永勤)a), Ye Rong-Chang(叶荣昌)a), and Wu Guang-Heng(吴光恒)b)   

  1. a School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China; b Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2010-02-11 Revised:2010-02-25 Online:2010-09-15 Published:2010-09-15
  • Supported by:
    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).

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摘要： 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.

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.

Key words: magnetic refrigeration capacity, first-order magnetic transition, Heusler alloys

中图分类号: 

  • 7530S