| Magnetic hysteresis and refrigeration capacity of Ni-Mn-Ga alloys near Martensitic transformation |
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| 作者姓名： | 傅斌 龙毅 段静芳 王超伦 常永勤 叶荣昌 吴光恒 |
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| 作者单位： | School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;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 |
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| 基金项目： | 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 |
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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.
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| 关 键 词： | magnetic refrigeration capacity first-order magnetic transition Heusler alloys |
| 收稿时间： | 2010-02-11 |
Magnetic hysteresis and refrigeration capacity of Ni—Mn—Ga alloys near Martensitic transformation |
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| Fu Bin,Long Yi,Duan Jing-Fang,Wang Chao-Lun,Chang Yong-Qin,Ye Rong-Chang and Wu Guang-Heng.Magnetic hysteresis and refrigeration capacity of Ni-Mn-Ga alloys near Martensitic transformation[J].Chinese Physics B,2010,19(9):97501-097501. |
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| Authors: | Fu Bin Long Yi Duan Jing-Fang Wang Chao-Lun Chang Yong-Qin Ye Rong-Chang and Wu Guang-Heng |
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| Institution: | [1]School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China [2]Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China |
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| 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. |
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| Keywords: | magnetic refrigeration capacity first-order magnetic transition Heusler alloys |
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