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Unconventional magnetization textures and domain-wall pinning in Sm–Co magnets
Some of the best-performing high-temperature magnets are Sm–Co-based alloys with a microstructure that comprises an [Formula: see text] matrix and magnetically hard [Formula: see text] cell walls. This generates a dense domain-wall-pinning network that endows the material with remarkable magnetic ha...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7713442/ https://www.ncbi.nlm.nih.gov/pubmed/33273594 http://dx.doi.org/10.1038/s41598-020-78010-0 |
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author | Pierobon, Leonardo Kovács, András Schäublin, Robin E. Gerstl, Stephan S. A. Caron, Jan Wyss, Urs V. Dunin-Borkowski, Rafal E. Löffler, Jörg F. Charilaou, Michalis |
author_facet | Pierobon, Leonardo Kovács, András Schäublin, Robin E. Gerstl, Stephan S. A. Caron, Jan Wyss, Urs V. Dunin-Borkowski, Rafal E. Löffler, Jörg F. Charilaou, Michalis |
author_sort | Pierobon, Leonardo |
collection | PubMed |
description | Some of the best-performing high-temperature magnets are Sm–Co-based alloys with a microstructure that comprises an [Formula: see text] matrix and magnetically hard [Formula: see text] 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. |
format | Online Article Text |
id | pubmed-7713442 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-77134422020-12-08 Unconventional magnetization textures and domain-wall pinning in Sm–Co magnets Pierobon, Leonardo Kovács, András Schäublin, Robin E. Gerstl, Stephan S. A. Caron, Jan Wyss, Urs V. Dunin-Borkowski, Rafal E. Löffler, Jörg F. Charilaou, Michalis Sci Rep Article Some of the best-performing high-temperature magnets are Sm–Co-based alloys with a microstructure that comprises an [Formula: see text] matrix and magnetically hard [Formula: see text] 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. Nature Publishing Group UK 2020-12-03 /pmc/articles/PMC7713442/ /pubmed/33273594 http://dx.doi.org/10.1038/s41598-020-78010-0 Text en © The Author(s) 2020 Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Pierobon, Leonardo Kovács, András Schäublin, Robin E. Gerstl, Stephan S. A. Caron, Jan Wyss, Urs V. Dunin-Borkowski, Rafal E. Löffler, Jörg F. Charilaou, Michalis Unconventional magnetization textures and domain-wall pinning in Sm–Co magnets |
title | Unconventional magnetization textures and domain-wall pinning in Sm–Co magnets |
title_full | Unconventional magnetization textures and domain-wall pinning in Sm–Co magnets |
title_fullStr | Unconventional magnetization textures and domain-wall pinning in Sm–Co magnets |
title_full_unstemmed | Unconventional magnetization textures and domain-wall pinning in Sm–Co magnets |
title_short | Unconventional magnetization textures and domain-wall pinning in Sm–Co magnets |
title_sort | unconventional magnetization textures and domain-wall pinning in sm–co magnets |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7713442/ https://www.ncbi.nlm.nih.gov/pubmed/33273594 http://dx.doi.org/10.1038/s41598-020-78010-0 |
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