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Giant low-field magnetocaloric effect in Si alloyed Ni-Co-Mn-In alloys

Abstract : For NiMn-based Heusler alloys, simultaneously achieving high magnetization difference and low thermal hysteresis across the magnetostructural transformation is of crucial importance to obtain large low-field actuated magnetocaloric properties. Here, the fifth element Si was introduced to replace In for reducing the thermal hysteresis in Ni-Co-Mn-In alloys while keeping a large magnetization change through the martensitic transformation. Consequently, a giant maximum entropy change ΔSMmax of 33.6 J kg−1 K−1 under the low field change of 2 T was achieved in a Ni45Co5Mn37In12Si1 alloy, which is among the highest values reported in NiMn-based alloys.
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Submitted on : Thursday, December 17, 2020 - 3:51:33 PM
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Zongbin Li, Shuya Dong, Zhenzhuang Li, Bo Yang, Fang Liu, et al.. Giant low-field magnetocaloric effect in Si alloyed Ni-Co-Mn-In alloys. Scripta Materialia, Elsevier, 2019, 159, pp.113-118. ⟨10.1016/j.scriptamat.2018.09.029⟩. ⟨hal-03080261⟩



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