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

doi:10.1088/1674-1056/19/9/097501

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
Accepted manuscript online:

PACS:	7530S
	7550

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).

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Fu Bin(傅斌), Long Yi(龙毅), Duan Jing-Fang(段静芳), Wang Chao-Lun(王超伦), Chang Yong-Qin(常永勤), Ye Rong-Chang(叶荣昌), and Wu Guang-Heng(吴光恒) Magnetic hysteresis and refrigeration capacity of Ni–Mn–Ga alloys near Martensitic transformation 2010 Chin. Phys. B 19 097501

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

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