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

M. Duerrschnabel, M. Yi, K. Uestuener, M. Liesegang, M. Katter, H.-J. Kleebe, B. Xu, O. Gutfleisch and L. Molina-Luna ()
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M. Duerrschnabel: Technische Universität Darmstadt
M. Yi: Technische Universität Darmstadt
K. Uestuener: Vacuumschmelze GmbH & Co. KG
M. Liesegang: Vacuumschmelze GmbH & Co. KG
M. Katter: Vacuumschmelze GmbH & Co. KG
H.-J. Kleebe: Technische Universität Darmstadt
B. Xu: Technische Universität Darmstadt
O. Gutfleisch: Technische Universität Darmstadt
L. Molina-Luna: Technische Universität Darmstadt

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: 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.

Date: 2017
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DOI: 10.1038/s41467-017-00059-9

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