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Unusual Lattice-Magnetism Connections in MnBi Nanorods

机译：MnBi纳米棒中不寻常的晶格磁性连接

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摘要

Lattice parameter, particle size, and thermal expansion results obtained from high-temperature synchrotron transmission X-ray diffraction are reported for magnetostructual NiAs-type MnBi nanorods embedded in a Bi matrix. The structural data are consistent with elevated-temperature magnetic measurements that indicate a first-order nanorod Curie transition at 520 K, significantly depressed from the bulk MnBi Curie temperature of 633 K. The data suggest that the unit cell volume dependence of the magnetic behavior-also known as the volume exchange striction-of the MnBi compound is the determining factor underlying this phenomenon. The results imply that materials with magnetostructural transitions of technological interest may be altered by strain effects to tailor the interatomic distances towards the critical transition values.
机译：报道了嵌入Bi矩阵的Nias型MnBi纳米结构的Nias型MnBi纳米棒的晶格参数，粒度和从高温同步加速器透射X射线衍射获得的热膨胀结果。结构数据与高温磁测量结果一致，高温磁测量表明在520 K处发生了一阶纳米棒居里跃迁，大大低于633 K的整体MnBi居里温度。也称为MnBi化合物的体积交换收缩是这种现象的决定性因素。结果表明，具有磁性结构转变的材料可能会因应变效应而改变，以使原子间距离朝着临界转变值方向变化。

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