Efficiently controlling crystallization and magnetic properties of nanostructured Nd-Ce-Fe-B ribbons via electron beam exposure

Zha, Liang; Wu, Rui; Liu, Zhou; Xue, Mingzhu; Yang, Jie; Qiao, Guanyi; Yang, Wenyun; Han, Jingquan; Li, Yanli; Han, Li; Kong, Xiangdong; Liu, J. Ping; Xia, Weixing

doi:10.1016/j.jallcom.2019.151669

Cited by 7 publications

(2 citation statements)

References 25 publications

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“…Contrary to the conventional furnace annealing strategies, the extremely high heating rate (in the order of 10 3 K s −1 ) enabled by EBE makes it possible to engineer GB while maintaining a refined microstructure by preventing the undesired grain growth. In our earlier work, we reported that EBE can tailor the microstructure effectively, such as grain sizes, grain shapes, and grain alignments [7,20,21]. This strategy is technically new and has been proved to be extensible to other magnetic materials.…”

Section: Introductionmentioning

confidence: 99%

“…Inevitably, this low heating rate induces the grain growth and coarsening, resulting in a detrimental effect on permanent magnet performance [15][16][17][18][19]. Here, we report a novel rapid thermal processing (RTP) strategy, electron-beam exposure (EBE) based on a large beam energy, which can lead to extremely high heating rates in low-dimensional systems such as ribbons and films [7,20,21]. Contrary to the conventional furnace annealing strategies, the extremely high heating rate (in the order of 10 3 K s −1 ) enabled by EBE makes it possible to engineer GB while maintaining a refined microstructure by preventing the undesired grain growth.…”

Section: Introductionmentioning

confidence: 99%

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A novel strategy for the fabrication of high-performance nanostructured Ce-Fe-B magnetic materials via electron-beam exposure

et al. 2021

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Ce 2 Fe 14 B compound has a great potential to serve as a novel permanent magnet alternative thanks to the abundant and inexpensive rare-earth element (cerium), while its low magnetocrystalline anisotropy and energy product severely restrict its applications. In this work, a novel strategy combining melt-spinning and electron-beam exposure (EBE) aiming for fabricating high-performance Ce-Fe-B magnetic materials is reported to solve the above-mentioned problem. Remarkably, this strategy facilitates developing a suitable grain boundary configuration without using any additional heavy rare-earth element. Under the optimal EBE condition, the maximum energy product ((BH) max ) of pure Ce-Fe-B alloy is 6.5 MGOe, about four times higher than that obtained after conventional rapid thermal processing method for the same precursor. The enhanced intergranular magnetostatic coupling effect in the EBE sample is validated by mapping the first-order-reversal-curve (FORC) diagrams. The in-situ observation of magnetic domain wall motion for Ce-Fe-B alloy using Lorentz transmission electron microscopy reveals that the boundary layers are very effective in pinning the motion of domain walls, leading to the increased coercivity under EBE, and this pinning effect is further verified by micromagnetic simulations. Our results suggest that CeFeB materials using EBE could be a promising candidate after further processing, which could fill the performance "gap" between hexaferrite and Nd-Fe-B-based magnets.

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Section: Introductionmentioning

confidence: 99%