钛(铬)取代的 Fe2CrV 全 D 金属 Heusler 铁磁体的结构、磁性和电子/热传输演变

Yiting Feng, Shen Zhang, Qingqi Zeng, Meng Lyu, Junyan Liu, Jinying Yang, Yibo Wang, Qiusa Ren, Yang Liu, Binbin Wang, Hongxiang Wei, Enke Liu
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引用次数: 0

摘要

全 D 金属全赫斯勒合金具有优异的机械性能和高自旋极化,这将在自旋电子应用中发挥重要作用。尽管如此,迄今为止,人们尚未对它们的电学和热学传输特性进行全面研究。在这项研究中,我们结合理论计算和实验,分析了 Cr- 和 Ti 取代的 Fe2CrV 全 D 金属 Heusler 合金的结构、磁性和传输特性的演变。这两个系列的合金都结晶成 Hg2CuTi- 型结构。随着钛掺杂量的增加,Fe50Cr25V25-xTix 的计算总磁矩呈线性下降。当 x < 4 时,实验饱和磁化率与理论计算结果和斯莱特-保龄法则高度一致,表明原子占据高度有序。磁化和居里温度可以通过改变自旋极化和交换相互作用进行显著调整。引入外来原子 Ti 会导致残余电阻率线性增加,而电子-声子散射则保持相对恒定。电学和热学传输特性的最大值出现在铁/铬/钒的化学成分中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evolution of structure, magnetism, and electronic/thermal-transports of Ti(Cr)-substituted Fe2CrV all-d-metal Heusler ferromagnets
All-d-metal full-Heusler alloys possess superior mechanical properties and high spin polarization, which would play an important role in spintronic applications. Despite this, their electrical and thermal transport properties have not been comprehensively investigated till now. In this work, we present an analysis on the evolution of structural, magnetic and transport properties of Cr- and Ti-substituted Fe2CrV all-d-metal Heusler alloys by combining theoretical calculations and experiments. Both series of alloys crystallize in Hg2CuTi-type structure. With increasing Ti doping, the calculated total magnetic moments of Fe50Cr25V25-xTix decrease linearly. The experimental saturation magnetization is highly consistent with theoretical calculations and Slater-Pauling rule when x < 4, indicating the highly ordered atomic occupation. The magnetization and Curie temperature can be significantly tuned by altering spin polarizations and exchange interactions. The introduction of the foreign atom, Ti, results in a linear increase in residual resistivity, while electron-phonon scattering keeps relatively constant. The maximum values for electrical and thermal transport properties are observed in the stoichiometric Fe2CrV composition.
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