Tailoring the magnetostructural transition and magnetocaloric properties around room temperature: In-doped Ni-Mn-Ga alloys

Tailoring the magnetostructural transition and magnetocaloric properties around room temperature: In-doped Ni-Mn-Ga alloys
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定制室温附近的磁结构转变和磁热特性:In 掺杂 Ni-Mn-Ga 合金

DOI:
10.1063/1.4895929
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发表时间:
2014-09
影响因子:
4
通讯作者:
Huibin Xu
Huibin Xu
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Linfang Zhang;Jingmin Wang;Hui Hua;Chengbao Jiang;Huibin Xu

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一些非化学计量的 Ni-Mn-Ga 合金经历从铁磁马氏体到顺磁奥氏体的耦合磁结构转变,从而产生大的磁热效应。然而,Ni-Mn-Ga合金的磁结构转变通常发生在高于室温的温度下。在这里,我们报告说,通过用 In 部分替代 Ga,顺磁性奥氏体相得到很好的稳定,并且可以在室温附近调整磁结构转变。 In掺杂Ni-Mn-Ga合金磁结构转变附近的磁场变化引起了相当大的磁熵变化和绝热温度变化。
Some off-stoichiometric Ni-Mn-Ga alloys undergo a coupled magnetostructural transition from ferromagnetic martensite to paramagnetic austenite, giving rise to the large magnetocaloric effect. However, the magnetostructural transitions of Ni-Mn-Ga alloys generally take place at temperatures higher than room temperature. Here, we report that by the partial substitution of In for Ga, the paramagnetic austenite phase is well stabilized, and the magnetostructural transition can be tailored around room temperature. Sizable magnetic entropy change and adiabatic temperature change were induced by magnetic field change in the vicinity of the magnetostructural transition of the In-doped Ni-Mn-Ga alloys.
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