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Abstract：
In this work, a bibliometric study was carried out to perform a scientific and technological analysis of exchange-spring magnets, an alternative permanent magnet synthesized by reducing or eliminating the use of critical raw materials, such as rare earths. The bibliometric analysis utilized the Scopus database, Orbit-Intellixir, VOSviewer, Orbit-Intelligence and Loglet Lab 4 software for maturity analysis, keyword network representations, charts and graphs for scientific articles and/or patents. A special analysis was performed on nanocomposite and thin-films systems based on Nd-Fe-B, SmCo5 and Mn-Al-C alloys, either mixed or layered with a soft magnetic phase, where relevant information on their magnetic parameters was compilated in tables, highlighting the nanostructured systems that have been exhibited the best permanent magnet properties. The bibliometric analysis revealed that the primary production of scientific articles is concentrated in industrialized countries, and they are predominantly published in journals dedicated to magnetism. A patents analysis showed that Nissan motors is by far the main applicant, with most of its patents is focused on technological domains related to electrical machinery, apparatus, energy and metallurgy. On the other hand, the S-curve of maturity for scientific articles indicated that the study of exchange-spring magnets is entering a mature state. In contrast, patent production, following a bi-logistic model, is in a saturation stage for the second S-curve. Maturity analyses, employing S-curve, bi-logistic and multi-logistic models, were performed on nanocomposites and thin films based on Nd-Fe-B, SmCo5 and Mn-Al-C alloys, respectively. We found that the investigation in Nd-Fe-B-based alloys is close to enter to a scientific saturation stage, while an average growth stage is observed for the SmCo5 and Mn-Al-C-based alloys. This suggests that research on alternative magnets, capable of fulfilling technological applications where a Nd-Fe-B magnets are commonly used, is a topic of significant interest.
摘要：
在这项工作中,进行了文献计量学研究，以对交换弹簧磁体进行科学技术分析，通过减少或消除关键原材料的使用而合成的替代永磁体，比如稀土。文献计量分析利用了Scopus数据库，Orbit-Intellixir,VOSviewer,用于成熟度分析的Orbit-Intelligence和LogletLab4软件，关键字网络表示，科学论文和/或专利的图表和图表。对基于Nd-Fe-B的纳米复合材料和薄膜系统进行了特殊分析，SmCo5和Mn-Al-C合金,与软磁相混合或分层，在表格中汇编了有关其磁参数的相关信息，突出纳米结构系统已表现出最佳的永磁性能。文献计量分析表明，科学论文的主要生产集中在工业化国家，它们主要发表在专门研究磁学的期刊上。一项专利分析表明，日产汽车是迄今为止的主要申请人，其大部分专利都集中在与电机相关的技术领域，设备,能源和冶金。另一方面,科学论文的成熟度S曲线表明，交换弹簧磁体的研究正在进入成熟状态。相比之下,专利生产,遵循双逻辑模型，处于第二S曲线的饱和阶段。成熟度分析，采用S曲线，双逻辑和多逻辑模型，在基于Nd-Fe-B的纳米复合材料和薄膜上进行，SmCo5和Mn-Al-C合金,分别。我们发现，对Nd-Fe-B基合金的研究接近进入科学饱和阶段，同时观察到SmCo5和Mn-Al-C基合金的平均生长阶段。这表明对替代磁铁的研究，能够满足通常使用Nd-Fe-B磁体的技术应用，是一个非常感兴趣的话题。
