The influence of Co addition on the magnetocaloric effect of Nanoperm-type amorphous alloys
The influence of Co addition on the magnetocaloric effect of Nanoperm-type amorphous alloys
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DOI：
10.1063/1.2337871
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发表时间：
2006-09-15
影响因子：
3.2
通讯作者：
Conde, A.
中科院分区：
文献类型：
--
作者：
Franco, V.;Blazquez, J. S.;Conde, A.
在室温以上研究了Co掺杂对纳米级非晶态合金磁热效应的影响。CO的加入增加了最大磁熵变，并使其相关温度向更高的温度移动。当最大外加磁场H=15KoE时，本研究得到的最大制冷量(Rc)值为82J kg(-1)。这一数值与在相同实验条件下测得的含钼Finemet型合金的数值相差30%。然而，当从对应于半最大熵变值的温度计算时，合金的RC随着合金中Co的存在而恶化。还分析了磁熵变的场依赖关系，表明样品的所有磁区都具有功率依赖关系。这种居里温度下的场依赖关系偏离了平均场的预测。(C)2006年美国物理研究所。
The effect of Co addition on the magnetocaloric effect of amorphous alloys with Nanoperm-type composition has been studied for temperatures above room temperature. Co addition produces an increase in the maximum magnetic entropy change and a shift of its associated temperature to higher temperatures. The maximum refrigerant capacity (RC) value obtained in this study is 82 J kg(-1) for a maximum applied field H=15 kOe. This value is similar to 30% larger than that of a Mo-containing Finemet-type alloy measured under the same experimental conditions. However, the RC of the alloys, when calculated from temperatures corresponding to the half-maximum entropy change value, deteriorates with the presence of Co in the alloy. The field dependence of the magnetic entropy change has also been analyzed, showing a power dependence for all the magnetic regimes of the samples. This field dependence at the Curie temperature deviates from mean field predictions. (c) 2006 American Institute of Physics.