Large coercivity and enhanced magnetization in La-substituted Sm6Mn23 alloys

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences Pub Date : 2024-10-23 DOI:10.1016/j.solidstatesciences.2024.107732

Hai-Feng Nie , Ying-Hua Liang , Jihoon Park , Tian-Hong Zhou , Bao-Chao Zhang , Ping-Zhan Si , Xing Zheng , Youngwoon Song , Chul-Jin Choi , Qiong Wu

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Abstract

The magnetic properties of Sm₆Mn₂₃-based alloys are still not fully understood for their high complexity in magnetic and crystallographic structures. This work presents studies of the structure and magnetic properties of Sm₆Mn₂₃ and Sm₅LaMn₂₃ alloys. The results show that both the binary and La-substituted ternary alloys crystallize in a cubic Th₆Mn₂₃ type structure (Fm-3m) with trace amount of Mn impurities. The lattice parameter of Sm₅LaMn₂₃ is slightly larger than that of Sm₆Mn₂₃. The Curie temperature of Sm₅LaMn₂₃ is ∼403 K, which is lower than that of Sm₆Mn₂₃. A field-dependent magnetic transition was observed in Sm₅LaMn₂₃, which shows a decreasing temperature at which Sm₅LaMn₂₃ exhibiting maximal magnetization with increasing field, indicating a suppression of the antiferromagnetic coupling of the rare earth and Mn moments under applied field. Large coercivities up to 0.74 T and 1.2 T are observed in Sm₅LaMn₂₃ bulk alloys and powders, respectively. The saturate magnetization, the remanent magnetization, and the coercivity of Sm₅LaMn₂₃ at 5 K are much higher than that of Sm₆Mn₂₃. The ball-milled Sm₅LaMn₂₃ powders exhibit significantly enhanced coercivity and magnetization. The refinement of the grain size during ball-milling results in the enhanced coercivity. The magnetic purification of the powders and possible local ferromagnetic configuration of the surface Mn atoms may result in the enhanced magnetization.

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La 取代 Sm6Mn23 合金中的大矫顽力和增强磁性

由于 Sm6Mn23 基合金在磁性和晶体结构上的高度复杂性，其磁性能仍未得到充分了解。本研究对 Sm6Mn23 和 Sm5LaMn23 合金的结构和磁性能进行了研究。结果表明，二元合金和 La 取代的三元合金都结晶为立方 Th6Mn23 型结构 (Fm-3m)，其中含有微量的锰杂质。Sm5LaMn23 的晶格参数略大于 Sm6Mn23。Sm5LaMn23 的居里温度为 403 K，低于 Sm6Mn23。在 Sm5LaMn23 中观察到了与磁场相关的磁转变，即随着磁场的增加，Sm5LaMn23 表现出最大磁化时的温度降低，这表明在外加磁场下稀土和锰矩的反铁磁耦合受到了抑制。在 Sm5LaMn23 块体合金和粉末中分别观察到高达 0.74 T 和 1.2 T 的大矫顽力。在 5 K 时，Sm5LaMn23 的饱和磁化、剩磁和矫顽力远高于 Sm6Mn23。球磨 Sm5LaMn23 粉末的矫顽力和磁化率明显提高。球磨过程中晶粒尺寸的细化导致了矫顽力的增强。粉末的磁性纯化和表面锰原子可能存在的局部铁磁性构型可能会导致磁化增强。

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来源期刊

Solid State Sciences 化学-无机化学与核化学

CiteScore

6.60

自引率

2.90%

发文量

214

审稿时长

27 days

期刊介绍： Solid State Sciences is the journal for researchers from the broad solid state chemistry and physics community. It publishes key articles on all aspects of solid state synthesis, structure-property relationships, theory and functionalities, in relation with experiments. Key topics for stand-alone papers and special issues: -Novel ways of synthesis, inorganic functional materials, including porous and glassy materials, hybrid organic-inorganic compounds and nanomaterials -Physical properties, emphasizing but not limited to the electrical, magnetical and optical features -Materials related to information technology and energy and environmental sciences. The journal publishes feature articles from experts in the field upon invitation. Solid State Sciences - your gateway to energy-related materials.