Realisation of magnetostructural coupling and a large magnetocaloric effect in the MnCoGe1+x system
Realisation of magnetostructural coupling and a large magnetocaloric effect in the MnCoGe1+x system
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在MnCoGe1x系统中实现磁结构耦合和大磁热效应
DOI：
10.1016/j.jmmm.2017.05.021
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发表时间：
2017-10-01
影响因子：
2.7
通讯作者：
Xu, Feng
中科院分区：
文献类型：
--
作者：
ul Hassan, Najam;Chen, Fenghua;Xu, Feng
磁场诱导MnCoGe基合金发生的磁结构转变由于其相关的多重磁响应效应而引起了人们的广泛关注。在宽的工作温度范围内最大化这些效应的关键是在转变期间增加磁化强度差，同时维持Ni2In和TiNiSi相的居里温度。在这项工作中，我们通过将额外的Ge原子导入MnCoGe合金中来实现上述目标，因为Ge含量的增加急剧降低了相变温度，但不影响系统中的居里温度。结果表明，在70 K的居里温度窗口内实现了顺磁性Ni2In相和铁磁性TiNiSi相之间的磁结构转变.磁场可以引起磁结构的转变，从而产生相当大的熵变。(C)2017爱思唯尔B.V.保留所有权利。
Magnetic field-induced magnetostructural transformations taking place in MnCoGe-based alloys attract considerable attention due to their associated multi-magnetoresponsive effects. The key to maximising these effects across a wide working temperature range is to increase the magnetisation difference during the transformation and simultaneously sustain the Curie temperatures of the Ni2In and TiNiSi phases. In this work, we achieve the above goals by importing additional Ge atoms into the MnCoGe alloy, as the increase in Ge content sharply decreases the transformation temperature but does not influence the Curie temperatures in the system. As a result, magnetostructural transformation between paramagnetic Ni2In and ferromagnetic TiNiSi phases is realised within a Curie-temperature window of 70 K. The magnetostructural transformation can be induced by the magnetic field, bringing about considerable entropy change. (C) 2017 Elsevier B.V. All rights reserved.