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Magnetic properties, domain structure, and microstructure of anisotropic SmCo6.5Zr0.5 ribbons with C addition

Published online by Cambridge University Press:  26 November 2012

A-Ru Yan ,
Zhi-Gang Sun ,
Wen-Yong Zhang ,
Hong-Wei Zhang  and
Bao-Gen Shen
A-Ru Yan
Affiliation:
State Key Laboratory of Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Science, Beijing 100080, People's Republic of China
Zhi-Gang Sun
Affiliation:
State Key Laboratory of Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Science, Beijing 100080, People's Republic of China
Wen-Yong Zhang
Affiliation:
State Key Laboratory of Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Science, Beijing 100080, People's Republic of China
Hong-Wei Zhang
Affiliation:
State Key Laboratory of Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Science, Beijing 100080, People's Republic of China
Bao-Gen Shen
Affiliation:
State Key Laboratory of Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Science, Beijing 100080, People's Republic of China
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Abstract

The magnetic properties and the domain structure of anisotropic melt-spun SmCo6.5Zr0.5 alloys with C addition was investigated by means of x-ray diffraction (XRD), magnetic measurement, and magnetic force microscopy. The XRD analyses showed that the addition of a few percent of C led to a significant increase in the coercivity and simultaneously affected the characterization of crystalline texture of the ribbons. The easy magnetization c axis changed from parallel to the ribbon plane for SmCo6.5Zr0.5 ribbons to normal to the ribbon plane for SmCo6.5Zr0.5C0.25−0.75 ribbons. An optimal coercivity of 0.92 T was obtained for the SmCo6.5Zr0.5C0.5 ribbon spun at 5 m/s. The corresponding remanence measured normal or parallel to the ribbon plane was 7.1 kGs or 3.1 kGs, respectively. The domain structure was studied by magnetic force microscopey. A strip-shaped domain was observed on the surface of the SmCo6.5Zr0.5 ribbons and the walls lay straight and parallel. For C-doped ribbons, the domain walls formed a maze domain pattern of grains with c axis normal to the ribbon plane. Scanning electron micrographs showed that a dendrite structure was present in the SmCoZr ribbon surface, and C addition caused the above-mentioned dendrite to diminish.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 16 , Issue 3 , March 2001 , pp. 629 - 632
Copyright
Copyright © Materials Research Society 2001

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References

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