Relationship between the magnetic field distribution and attractive force of single-domain YBCO bulk under different field cooling processes |
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| Authors: | Yang Wan-Min Zhou Lian Feng Yong Zhang Ping-Xiang R. Nicolsky |
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| Affiliation: | 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 |
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| Abstract: | 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. |
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| Keywords: | single-domain YBCO bulk levitation and attractive force field cooling process |
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