磁制冷
等温过程
材料科学
变质磁性
磁滞
磁化
凝聚态物理
热滞后
磁滞
合金
温度循环
磁场
形状记忆合金
磁性形状记忆合金
热力学
热的
冶金
磁畴
物理
相变
量子力学
作者
Enric Stern‐Taulats,Pedro O. Castillo-Villa,Lluı́s Mañosa,Carlos Frontera,S. Pramanick,S. Majumdar,Antoni Planes
摘要
We have studied magnetocaloric properties of a Ni-Mn-In metamagnetic shape-memory alloy especially designed in order to display low thermal hysteresis. Magnetization and calorimetric measurements under a magnetic field have been used in order to determine isothermal magnetic field-induced entropy changes. Results obtained indirectly from magnetization data, quasi-directly from isofield calorimetric measurements, and directly from isothermal calorimetric runs are systematic and agree well with each other. We have analyzed the reproducibility of magnetocaloric properties with cycling from direct isothermal calorimetric measurements. Due to low thermal hysteresis, we have found that about 80% of the transition entropy change, ΔSt ≃ 25 J/kg K, can be reversibly induced under successive application and removal of a field of 6 T.
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