Evolution of magnetic domain structures and coercivity in high-performance SmCo 2:17-type permanent magnets

Evolution of magnetic domain structures and coercivity in high-performance SmCo 2:17-type permanent magnets

The magnetic domain structure of SmCo 2:17-type magnets has been found to be very sensitive to details of the processing procedure. In optimally processed high-temperature Sm(Co 0.784Fe 0.100Cu 0.088Zr 0.028) 7.19 magnets, the typical domain width is less than 1 μm, but significantly larger than the...

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Veröffentlicht in:Acta materialia 2006-02, Vol.54 (4), p.997-1008
Hauptverfasser: Gutfleisch, O., Müller, K.-H., Khlopkov, K., Wolf, M., Yan, A., Schäfer, R., Gemming, T., Schultz, L.
Format: Artikel
Sprache:eng
Schlagworte:
Applied sciences
Coarsening
Coercive force
Coercivity
Evolution
Exact sciences and technology
Magnetic domain structure
Magnetic domains
Magnetic force microscopy
Magnets
Metals. Metallurgy
Optimization
Permanent magnets
Quenching
SmCo alloys
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Zusammenfassung:The magnetic domain structure of SmCo 2:17-type magnets has been found to be very sensitive to details of the processing procedure. In optimally processed high-temperature Sm(Co 0.784Fe 0.100Cu 0.088Zr 0.028) 7.19 magnets, the typical domain width is less than 1 μm, but significantly larger than the typical size of 2:17R cells of about 100 nm. However, quenching straight from the aging temperature of 850 °C, i.e. omitting slow cooling, leads to a much coarser domain structure (domain width ∼10 μm) and a small coercivity (
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2005.10.026