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Magnetic Anisotropy of Sm(Co0.68Fe0.22Cu0.08Zr0.02)7.7 Ribbons Produced by Melt Spinning

Published online by Cambridge University Press:  31 January 2011

A-Ru Yan ,
Zhi-Gang Sun ,
Baoshan Han  and
Bao-Gen Shen
A-Ru Yan
Affiliation:
State Key Laboratory of Magnetism, Institute of Physics & Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
Zhi-Gang Sun
Affiliation:
State Key Laboratory of Magnetism, Institute of Physics & Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
Baoshan Han
Affiliation:
State Key Laboratory of Magnetism, Institute of Physics & Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
Bao-Gen Shen
Affiliation:
State Key Laboratory of Magnetism, Institute of Physics & Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
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Abstract

A high degree of texture was observed in melt-spun Sm(Co0.68Fe0.22Cu0.08Zr0.02)7.7 ribbons prepared by single-roller melt spinning at low wheel speed; their easy magnetization axis was parallel to the ribbon plane. Magnetization studies showed an obvious magnetic anisotropy and a 90% higher remanance in ribbons for the field parallel to the longitudinal direction (8.5 kGs) than that for the field parallel to the wide direction (4.4 kGs); this was attributed to a dendritic structure of needle-size grains (2–3 × 10–40 μm) with their long axis parallel to the ribbon plane. This texture allowed the development of a new process for producing anisotropic permanent magnets. The domain structure was studied by magnetic-force microscope. A highly ordered and strip-shaped magnetic domain structure was observed on the surface of the ribbons. This was due to the preference for tetragonal c-axis orientation parallel to the surface of melt-spun ribbons. We calculated the domain wall energy γ and critical single-domain particle size Dc of Sm(Co0.68Fe0.22Cu0.08Zr0.02)7.7 ribbons.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 3 , March 2002 , pp. 648 - 652
Copyright
Copyright © Materials Research Society 2002

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