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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...

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Autores principales: 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
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
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.
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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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