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

Author

Listed:
  • M. Duerrschnabel

    (Technische Universität Darmstadt)

  • M. Yi

    (Technische Universität Darmstadt)

  • K. Uestuener

    (Vacuumschmelze GmbH & Co. KG)

  • M. Liesegang

    (Vacuumschmelze GmbH & Co. KG
    Technische Universität Darmstadt)

  • 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)

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.

Suggested Citation

  • M. Duerrschnabel & M. Yi & K. Uestuener & M. Liesegang & M. Katter & H.-J. Kleebe & B. Xu & O. Gutfleisch & L. Molina-Luna, 2017. "Atomic structure and domain wall pinning in samarium-cobalt-based permanent magnets," Nature Communications, Nature, vol. 8(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-00059-9
    DOI: 10.1038/s41467-017-00059-9
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