ABSTRACT In this study, Ni2-x Co x MnSb full-Heusler alloys (1.00 ≤ x ≤ 1.75) were prepared by arc melting process, and examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), and SQUID. The L21 crystal structure of the synthesised Heusler alloy was confirmed by XRD patterns, and it was observed that the use of Co instead of Ni caused a decrease in the interatomic distance. The magnetisation results revealed that all samples show ferromagnetic (FM) behaviour, and substitution Co for Ni leads to increasing FM interactions in the samples. The calculated magnetic moment per formula unit increase from 4.38 µB(x = 1) to 5.17 µB (x = 1.75). On the other hand, the increase in FM interaction caused an increase in ferromagnetic-paramagnetic (PM) phase transition (T C) temperatures from 513 (x = 1) to 568 K (x = 1.75). The ability to control the Curie temperature with Co substitution makes these alloys suitable candidates for future spintronics and magnetoelectronic applications.

中文翻译：

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Co 取代 Ni2MnSb Heusler 合金的结构和磁性表征：钴取代对磁性和居里温度的影响

摘要 在这项研究中，Ni2-x Co x MnSb 全赫斯勒合金（1.00 ≤ x ≤ 1.75）是通过电弧熔化工艺制备的，并通过 X 射线衍射 (XRD)、扫描电子显微镜 (SEM) 和 SQUID 进行检测。合成的 Heusler 合金的 L21 晶体结构通过 XRD 图案得到证实，并且观察到使用 Co 代替 Ni 导致原子间距离减小。磁化结果表明，所有样品都表现出铁磁 (FM) 行为，用 Co 代替 Ni 导致样品中的 FM 相互作用增加。每个公式单位的计算磁矩从 4.38 µB(x = 1) 增加到 5.17 µB (x = 1.75)。另一方面，FM 相互作用的增加导致铁磁-顺磁 (PM) 相变 (TC) 温度从 513 (x = 1) 增加到 568 K (x = 1.75)。