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
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
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.
Received: 10 December 1999
Revised: 21 February 2000
Accepted manuscript online:
(Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization)
Fund: Project supported by the State Key Project of Fundamental Research and National Natural Science Foundation of China (Grant No. 59971063).
Cite this article:
Zhang Shao-ying (张绍英), Zhang Hong-wei (张宏伟), Zhao Peng (赵鹏), Shen Bao-gen (沈保根), F. R. de Boer, K. H. J. Buschow MAGNETIC VISCOSITY OF NANOCOMPOSITE Sm-Fe-Cu-Zr-Ga-C RIBBONS 2000 Chinese Physics 9 541
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