中国物理B ›› 2004, Vol. 13 ›› Issue (8): 1353-1357.doi: 10.1088/1009-1963/13/8/031

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Relationship between the magnetic field distribution and attractive force of single-domain YBCO bulk under different field cooling processes

杨万民1, R. Nicolsky2, 周廉3, 冯勇3, 张平祥3   

  1. (1)Department of Physics, Shaanxi Normal University, Xi'an 710062, China; Northwest Institute for Nonferrous Metal Research, Xi'an 710016, China; LASUP-DEE, UFRJ Ilha do Fundao, Cx. P. 68515 21945-970 Rio de Janeiro, RJ, Brazil; (2)LASUP-DEE, UFRJ Ilha do Fundao, Cx. P. 68515 21945-970 Rio de Janeiro, RJ, Brazil; (3)Northwest Institute for Nonferrous Metal Research, Xi'an 710016, China
  • 收稿日期:2003-03-07 修回日期:2003-12-09 出版日期:2004-06-21 发布日期:2005-06-30
  • 基金资助:
    Project supported by the Ministry of Science and Technology of China and by the State Key Development Programme for Basic Research of China (Grant No NKBRSF-G19990606).

Relationship between the magnetic field distribution and attractive force of single-domain YBCO bulk under different field cooling processes

Yang Wan-Min (杨万民)abc, Zhou Lian (周廉)b, Feng Yong (冯勇)b, Zhang Ping-Xiang (张平祥)b, R. Nicolskyc    

  1. a Department of Physics, Shaanxi Normal University, Xi'an 710062, China; b Northwest Institute for Nonferrous Metal Research, Xi'an 710016, China; c LASUP-DEE, UFRJ Ilha do Fundao, Cx. P. 68515 21945-970 Rio de Janeiro, RJ, Brazil
  • Received:2003-03-07 Revised:2003-12-09 Online:2004-06-21 Published:2005-06-30
  • Supported by:
    Project supported by the Ministry of Science and Technology of China and by the State Key Development Programme for Basic Research of China (Grant No NKBRSF-G19990606).

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摘要： The levitation forces under different field cooling states were measured at 77K by changing the field cooling distance Z_{fc} between a YBCO bulk and a permanent magnet. It is found that the relationship between the absolute maximum attractive force (Z_{maf}) and the corresponding gap distance (Z_{maf}) to F_{maf} can be well described by exponential laws as a function of Z_{fc}, which allow us to predict these values according to Z_{fc}. It is also found that the distance between the Z_{0fa} (gap distance corresponding to the zero force) and Z_{maf} in the ascending process is a constant value, which is closely related to the constant reduction factor of the axial component of flux density along the axial line of the magnet if Z_{maf}-Z_{0fa} is a constant value. These results are very interesting for fundamental research and helpful in practical designing and applications.

关键词: single-domain YBCO bulk, levitation and attractive force, field cooling process

Abstract: The levitation forces under different field cooling states were measured at 77K by changing the field cooling distance Zfc between a YBCO bulk and a permanent magnet. It is found that the relationship between the absolute maximum attractive force (Zmaf) and the corresponding gap distance (Zmaf) to Fmaf can be well described by exponential laws as a function of Zfc, which allow us to predict these values according to Zfc. It is also found that the distance between the Z0fa (gap distance corresponding to the zero force) and Zmaf in the ascending process is a constant value, which is closely related to the constant reduction factor of the axial component of flux density along the axial line of the magnet if Zmaf-Z0fa is a constant value. These results are very interesting for fundamental research and helpful in practical designing and applications.

Key words: single-domain YBCO bulk, levitation and attractive force, field cooling process

中图分类号: 

  • 74.72.Bk
74.25.Ha (Magnetic properties including vortex structures and related phenomena)