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Determination of the magnetocaloric effect associated with martensitic transition in Ni46Cu4Mn38Sn12 and Ni50CoMn34In15 Heusler alloys |
Li Zhe(李哲),Jing Chao(敬超)†,Zhang Hao-Lei(张浩雷), Cao Shi-Xun(曹世勋),and Zhang Jin-Cang(张金仓) |
Department of Physics, Shanghai University, Shanghai 200444, China |
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Abstract This paper presents a study of the inverse magnetocaloric effect (MCE) corresponding to martensitic transition using various experimental approaches for Ni46Cu4Mn38Sn12 and Ni50CoMn34In15 Heusler alloy. Through heat capacity measurements, it is found that the "giant inverse MCE" upon martensitic transition evaluated by the Maxwell relation in these alloys are unphysical results. This is due to the coexistence of both martensitic and austenitic phases, as well as thermal hysteresis during martensitic transition. However, careful study indicates that the spurious results during martensitic transition can be removed using a Clausius-Clapeyron equation based on magnetization measurements.
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Received: 31 July 2010
Revised: 06 November 2010
Accepted manuscript online:
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PACS:
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75.50.Cc
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(Other ferromagnetic metals and alloys)
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81.30.Kf
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(Martensitic transformations)
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75.30.Sg
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(Magnetocaloric effect, magnetic cooling)
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Fund: Project supported by the Science Foundation of Surface Physics Laboratory (National Key Laboratory) of Fudan University (Grant No. FDS2008-B01), the Graduate Innovation Foundation of Shanghai University (Grant Nos. SHUCX101065 and SHUCX102011) and the National Natural Science Foundation of China (Grant Nos. 50932003 and 10804068). |
Cite this article:
Li Zhe(李哲),Jing Chao(敬超),Zhang Hao-Lei(张浩雷), Cao Shi-Xun(曹世勋),and Zhang Jin-Cang(张金仓) Determination of the magnetocaloric effect associated with martensitic transition in Ni46Cu4Mn38Sn12 and Ni50CoMn34In15 Heusler alloys 2011 Chin. Phys. B 20 047502
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