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