中国物理B ›› 2000, Vol. 9 ›› Issue (7): 541-544.doi: 10.1088/1009-1963/9/7/014

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MAGNETIC VISCOSITY OF NANOCOMPOSITE Sm-Fe-Cu-Zr-Ga-C RIBBONS

张绍英1, 张宏伟1, 赵鹏1, 沈保根1, F. R. de Boer2, K. H. J. Buschow2   

  1. (1)State Key Laboratory of Magnetism, Institute of Physics & Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; (2)Van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65, 1018XE Amsterdam, The Netherlands
  • 收稿日期:1999-12-10 修回日期:2000-02-21 出版日期:2000-07-15 发布日期:2005-06-12
  • 基金资助:
    Project supported by the State Key Project of Fundamental Research and National Natural Science Foundation of China (Grant No. 59971063).

MAGNETIC VISCOSITY OF NANOCOMPOSITE Sm-Fe-Cu-Zr-Ga-C RIBBONS

Zhang Shao-ying (张绍英)a, Zhang Hong-wei (张宏伟)a, Zhao Peng (赵鹏)a, Shen Bao-gen (沈保根)a, F. R. de Boerb, K. H. J. Buschowb   

  1. a State Key Laboratory of Magnetism, Institute of Physics & Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; b Van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65, 1018XE Amsterdam, The Netherlands
  • Received:1999-12-10 Revised:2000-02-21 Online:2000-07-15 Published:2005-06-12
  • Supported by:
    Project supported by the State Key Project of Fundamental Research and National Natural Science Foundation of China (Grant No. 59971063).

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摘要： The magnetic viscosity was investigated at temperatures between 100 and 293 K for the nanocomposite Sm2Fe18.25Zr0.25Cu0.5Ga2C2 ribbons prepared by melt-spinning and subsequent annealing. It was found that the maximum S and χirr, located near coercivity, increase with increasing temperature. The viscosity parameter Sv was found to be strongly dependent on the applied fields at lower fields than the coercivities. The relation between Sv and coercivity was analyzed. The coercivity mechanism is mainly controlled by domain-wall pinning. The activation volume associated with magnetization reversal, which can be calculated from Sv, is much smaller than the grain volume.

Abstract: The magnetic viscosity was investigated at temperatures between 100 and 293 K for the nanocomposite Sm2Fe18.25Zr0.25Cu0.5Ga2C2 ribbons prepared by melt-spinning and subsequent annealing. It was found that the maximum S and $\chi$irr, located near coercivity, increase with increasing temperature. The viscosity parameter Sv was found to be strongly dependent on the applied fields at lower fields than the coercivities. The relation between Sv and coercivity was analyzed. The coercivity mechanism is mainly controlled by domain-wall pinning. The activation volume associated with magnetization reversal, which can be calculated from Sv, is much smaller than the grain volume.

Key words: nanocomposite ribbons, magnetic viscosity, coercivity mechanism

中图分类号:  (Domain walls and domain structure)

  • 75.60.Ch
75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects) 81.16.-c (Methods of micro- and nanofabrication and processing) 81.20.-n (Methods of materials synthesis and materials processing) 81.40.Ef (Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization)