锰镓纳米复合磁体的高磁性能

Nanomaterials Pub Date : 2024-07-24 DOI:10.3390/nano14151245
Ovidiu Crisan, A. Crisan
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引用次数: 0

摘要

鉴于其在需要磁体在较高温度下工作的技术领域的潜在适用性,过去二十年来,人们对稀土(RE)含量很少或没有稀土含量的纳米复合磁体进行了广泛研究。在这些纳米复合磁体中,表现出 L10 四方相形成的磁性二元系统子类最为突出。一些最有趣的系统以 Mn 基合金为代表,并添加了 Al、Bi、Ga、Ge。这类合金非常有趣,因为它们比 RE 磁体成本更低,而且显示出良好的磁性能。本文探讨了在 Mn3Ga 化学计量附近具有各种成分的 MnGa 二元合金。四种 MnGa 磁性合金的 Mn 含量从 70% 到 75% 不等,采用快速凝固法形成熔体。通过将 X 射线衍射仪和透射电子显微镜获得的结构信息与振动样品磁力测定法确定的磁性能相结合,我们能够记录合金在铸造状态和退火后形成的结构相的性质和属性、退火后相结构的演变及其对 MnGa 合金磁性能的影响。在 400 ℃ 和 500 ℃ 退火后,锰镓合金呈现出多相微观结构,由 L10 和 D022 四方相的共存晶粒组成。由于这些结构和磁性不同的相并存于微观结构中,因此获得了良好的磁性特征,其矫顽力场和饱和磁化率都超过了之前报道的两种合金和 MnGa 层的数值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
High Magnetic Performance in MnGa Nanocomposite Magnets
In view of their potential applicability in technology fields where magnets are required to operate at higher temperatures, the class of nanocomposite magnets with little or no rare earth (RE) content has been widely researched in the last two decades. Among these nanocomposite magnets, the subclass of magnetic binary systems exhibiting the formation of L10 tetragonal phases is the most illustrious. Some of the most interesting systems are represented by the Mn-based alloys, with addition of Al, Bi, Ga, Ge. Such alloys are interesting as they are less costly than RE magnets and they show promising magnetic properties. The paper tackles the case of MnGa binary alloys with various compositions around the Mn3Ga stoichiometry. Four MnGa magnetic alloys, with Mn content ranging from 70 at% to 75 at% were produced using rapid solidification to form the melt. By combining structural information arising from X-ray diffractometry and transmission electron microscopy with magnetic properties determined by vibrating sample magnetometry, we are able to document the nature and properties of the structural phases formed in the alloys in their as-cast state and upon annealing, the evolution of the phase structure after annealing and its influence on the magnetic behavior of the MnGa alloys. After annealing at 400 °C and 500 °C, MnGa alloys are showing a multiple-phase microstructure, consisting of co-existing crystallites of L10 and D022 tetragonal phase. As a consequence of these structurally and magnetically different phases, co-existing within the microstructure, promising magnetic features are obtained, with both coercive fields and saturation magnetization exceeding values previously reported for both alloys and layers of MnGa.
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