期刊
SCIENTIFIC REPORTS
卷 10, 期 1, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41598-020-78010-0
关键词
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资金
- Swiss National Science Foundation [200021-172934]
- European Research Council (ERC) under the European Union [856538]
- European Union [823717]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [405553726 - TRR 270]
- Swiss National Science Foundation (SNF) [200021_172934] Funding Source: Swiss National Science Foundation (SNF)
Some of the best-performing high-temperature magnets are Sm-Co-based alloys with a microstructure that comprises an Sm2Co17 matrix and magnetically hard SmCo5 cell walls. This generates a dense domain-wall-pinning network that endows the material with remarkable magnetic hardness. A precise understanding of the coupling between magnetism and microstructure is essential for enhancing the performance of Sm-Co magnets, but experiments and theory have not yet converged to a unified model. Here, transmission electron microscopy, atom probe tomography, and nanometer-resolution off-axis electron holography have been combined with micromagnetic simulations to reveal that the magnetization state in Sm-Co magnets results from curling instabilities and domain-wall pinning effects at the intersections of phases with different magnetic hardness. Additionally, this study has found that topologically non-trivial magnetic domains separated by a complex network of domain walls play a key role in the magnetic state by acting as nucleation sites for magnetization reversal. These findings reveal previously hidden aspects of magnetism in Sm-Co magnets and, by identifying weak points in the microstructure, provide guidelines for improving these high-performance magnetic materials.
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