Unconventional magnetization textures and domain-wall pinning in Sm–Co magnets
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Date
2020
Publication Type
Journal Article
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yes
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Abstract
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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published
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Journal / series
Volume
10 (1)
Pages / Article No.
21209
Publisher
Nature
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Organisational unit
02891 - ScopeM / ScopeM
03661 - Löffler, Jörg F. / Löffler, Jörg F.
Notes
Funding
172934 - Advanced nanoscale characterization of magnetic defects in metals (SNF)