Domain-wall curvature and coercivity in pinning type Sm{endash}Co magnets

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.364620· OSTI ID:496610

Skomski, R ^[1]

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1. Max-Planck-Institut fuer Mikrostrukturphysik Weinberg 2, 06120 Halle (Germany)

The origin of coercivity in precipitation hardened Sm{endash}Co magnets is investigated. By considering domain-wall pinning at boundary phase and Z phase inhomogenities, it is found that the hexagonal Z phase has no direct influence on the coercivity. The intuitive assumption of plane domain walls made in a recent calculation is unrealistic but has no direct effect on the coercivity. However, due to the comparatively large size of the 12:17 cells, the calculated three dimensional domain-wall curvature is sufficiently large to assure a nearly ideal nestling of the domain walls to the 1:5 cell boundary. This nestling yields a coercivity increase from about 0.1 to about 1 T and is therefore responsible for the high coercivity of 2:17 based Sm{endash}Co magnets. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 496610
• Report Number(s): CONF-961141--
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHEMICAL COMPOSITION
COBALT ALLOYS
COERCIVE FORCE
DOMAIN STRUCTURE
MAGNETIZATION
PERMANENT MAGNETS
SAMARIUM ALLOYS