A new model for the coercivity mechanism of Sm{sub 2}(Co,Fe,Cu,Zr){sub 17} magnets

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · IEEE Transactions on Magnetics

DOI:https://doi.org/10.1109/20.539161· OSTI ID:403351

Katter, M; Schrey, P; Rodewald, W ^[1]; Weber, J ^[1]; Assmus, W ^[2]

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1. Vacuumschmelze GmbH, Hanau (Germany)
2. Univ. Frankfurt (Germany)

A two-dimensional model for the coercivity mechanism of Sm{sub 2}(Co, Fe, Cu, Zr){sub 17} magnets is proposed. The high coercivities of fully heat-treated magnets (> 20 kA/cm) result from pinning sites which are formed by the intersections of the Zr-rich platelet phase (Z-phase) and the Cu-rich SmCo{sub 5} (1/5) boundary phase. The pinning strength of this site is assumed to be a result of the large difference between the domain wall energies of the 1/5 phase and the Z-phase. The domain wall energies of almost single phase samples of the Z-phase have been determined by magnetic measurements and by quantitative analysis of domain patterns. The small domain wall energy of the Z-phase of 4--11 mJ/m{sup 2} supports the presented model.

• OSTI ID: 403351
• Report Number(s): CONF-960425--
• Journal Information: IEEE Transactions on Magnetics, Journal Name: IEEE Transactions on Magnetics Journal Issue: 5Pt2 Vol. 32; ISSN IEMGAQ; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COBALT ALLOYS
COERCIVE FORCE
COPPER ALLOYS
DOMAIN STRUCTURE
IRON ALLOYS
MAGNETIC PROPERTIES
MATHEMATICAL MODELS
MICROSTRUCTURE
SAMARIUM ALLOYS
ZIRCONIUM ALLOYS