Origin of coercivity difference in Nd-Y-Fe-B single-main-phase and multi-main-phase magnets: Role of core–shell structures
Nd-Fe-B magnets with 30 at.% Y substitution were prepared using single-main-phase (SMP) and multi-main-phase (MMP) techniques to investigate the differences in magnetic properties and microstructures between spontaneously formed core–shell structures in the SMP magnet and those formed by elemental d...
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-10-01
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| Series: | Materials & Design |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127525010445 |
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| Summary: | Nd-Fe-B magnets with 30 at.% Y substitution were prepared using single-main-phase (SMP) and multi-main-phase (MMP) techniques to investigate the differences in magnetic properties and microstructures between spontaneously formed core–shell structures in the SMP magnet and those formed by elemental diffusion in the MMP magnet. Both SMP and MMP magnets exhibit different compositional types of core–shell structured grains, yet their phase structures and the rare-earth (RE) contents in the grain shells are consistent. The SMP magnet demonstrates a coercivity of 6.50 kOe, higher than the 4.96 kOe of the MMP magnet. Micromagnetic simulation results reveal that when the grain shell composition is consistent, the grain core has a more significant impact on the demagnetization process of the magnet. The magnetic domains of the MMP magnet with a higher proportion of Y-rich cores reverse at a lower external field. This correlation between microstructure and magnetic properties provides new insights into the structural design of Y-containing magnets. |
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| ISSN: | 0264-1275 |