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Atomic structure and domain wall pinning in samarium-cobalt based permanent magnets

Duerrschnabel, Michael and Yi, M. and Uestuener, K. and Liesegang, M. and Katter, M. and Kleebe, Hans-Joachim and Xu, Bai-Xiang and Gutfleisch, Oliver and Molina-Luna, Leopoldo (2017):
Atomic structure and domain wall pinning in samarium-cobalt based permanent magnets.
In: Nature communications, Nature, p. 54, 8, ISSN 2041-1723, DOI: 10.1038/s41467-017-00059-9, [Article]

Abstract

A higher saturation magnetization obtained by an increased iron content is essential for yielding larger energy products in rare-earth Sm2Co17-type pinning-controlled permanent magnets. These are of importance for high-temperature industrial applications due to their intrinsic corrosion resistance and temperature stability. Here we present model magnets with an increased iron content based on a unique nanostructure and -chemical modification route using Fe, Cu, and Zr as dopants. The iron content controls the formation of a diamond-shaped cellular structure that dominates the density and strength of the domain wall pinning sites and thus the coercivity. Using ultra-high-resolution experimental and theoretical methods, we revealed the atomic structure of the single phases present and established a direct correlation to the macroscopic magnetic properties. With further development, this knowledge can be applied to produce samarium cobalt permanent magnets with improved magnetic performance.

Item Type: Article
Erschienen: 2017
Creators: Duerrschnabel, Michael and Yi, M. and Uestuener, K. and Liesegang, M. and Katter, M. and Kleebe, Hans-Joachim and Xu, Bai-Xiang and Gutfleisch, Oliver and Molina-Luna, Leopoldo
Title: Atomic structure and domain wall pinning in samarium-cobalt based permanent magnets
Language: English
Abstract:

A higher saturation magnetization obtained by an increased iron content is essential for yielding larger energy products in rare-earth Sm2Co17-type pinning-controlled permanent magnets. These are of importance for high-temperature industrial applications due to their intrinsic corrosion resistance and temperature stability. Here we present model magnets with an increased iron content based on a unique nanostructure and -chemical modification route using Fe, Cu, and Zr as dopants. The iron content controls the formation of a diamond-shaped cellular structure that dominates the density and strength of the domain wall pinning sites and thus the coercivity. Using ultra-high-resolution experimental and theoretical methods, we revealed the atomic structure of the single phases present and established a direct correlation to the macroscopic magnetic properties. With further development, this knowledge can be applied to produce samarium cobalt permanent magnets with improved magnetic performance.

Journal or Publication Title: Nature communications
Volume: 8
Publisher: Nature
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Earth Science > Geo-Material-Science
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Advanced Electron Microscopy (aem)
11 Department of Materials and Earth Sciences > Material Science > Functional Materials
Date Deposited: 06 Dec 2018 10:16
DOI: 10.1038/s41467-017-00059-9
Funders: We acknowledge financial support from the Hessen State Ministry of Higher Education, Research and the Arts via LOEWE RESPONSE., The transmission electron microscopes used in this work were partially funded by the German Research Foundation (DFG/INST163/2951).
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