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Coercivity enhancement and magnetic property evaluation of Bi doped Mn2Sb
Journal of Magnetism and Magnetic Materials ( IF 2.7 ) Pub Date : 2019-04-01 , DOI: 10.1016/j.jmmm.2018.12.040
Kritika Anand , Nithya Christopher , Jagdish Kumar , Anurag Gupta , Nidhi Singh

Abstract Mn2Sb is a well-known ferrimagnetic material, which has been investigated thoroughly to understand the effect of doping on its magnetic properties. Present work reports the synthesis of Bi doped Mn2Sb employing arc-melting and melt spinning followed by characterization with a view to establish a correlation in the structure and magnetic properties. Bi doping in Mn2Sb lattice produces a significant change in the latter’s magnetic properties, giving rise to a saturation magnetization of 27.2 emu/g (27.2 Am2/Kg) and a high coercivity value of 3.4 kOe (279.2 kA/m), in comparison to Mn2Sb, which has a coercivity of 0.1 kOe (7.96 kA/m). Theoretical studies were carried out to understand the changes in magnetic properties. Ab-initio electronic and atomic structure calculations show that Bi atom occupies equally the MnI and MnII sites and this leads to ferromagnetic ordering, which results in enhancement of the saturation magnetisation. The coercivity mechanism has also been studied in detail; the large coercivity is attributed to the nucleation mechanism achieved via the inclusion of diamagnetic Bi particles in Mn2Sb.

中文翻译:

Bi掺杂Mn2Sb的矫顽力增强及磁性能评价

摘要 Mn2Sb 是一种众所周知的亚铁磁性材料,已经对其进行了深入研究以了解掺杂对其磁性能的影响。目前的工作报告了采用电弧熔化和熔体纺丝合成 Bi 掺杂的 Mn2Sb,然后进行表征,以建立结构和磁性能的相关性。Mn2Sb 晶格中的 Bi 掺杂使后者的磁性能发生显着变化,产生 27.2 emu/g (27.2 Am2/Kg) 的饱和磁化强度和 3.4 kOe (279.2 kA/m) 的高矫顽力值,与Mn2Sb,矫顽力为 0.1 kOe (7.96 kA/m)。进行了理论研究以了解磁性的变化。从头算电子和原子结构计算表明,Bi 原子同样占据 MnI 和 MnII 位点,这导致铁磁有序,从而导致饱和磁化强度的增强。还详细研究了矫顽力机制;较大的矫顽力归因于通过在 Mn2Sb 中包含抗磁性 Bi 颗粒实现的成核机制。
更新日期:2019-04-01
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