MAGNETIC-FLUX DISTRIBUTION DYNAMICS IN BI-2223/AG TAPES

被引：1
|
作者：
PAASI, J [1 ]
LAHTINEN, M [1 ]
ERIKSSON, JT [1 ]
SARKANIEMI, J [1 ]
机构：
[1] TAMPERE UNIV TECHNOL, INST MAT SCI, SF-33101 TAMPERE, FINLAND
来源：
IEEE TRANSACTIONS ON MAGNETICS | 1994年 / 30卷 / 04期
关键词：
D O I：
10.1109/20.305622
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
We have studied magnetic flux distribution dynamics in silver sheathed Bi-2223 superconducting tapes at 77 K using a novel Hall sensor technique. The flux distribution exhibits a strongly time dependent behaviour due to thermally activated flux creep in the intergranular current system. In applied constant fields the decrease of measured magnetic field profiles was due to a logarithmic relaxation in time of induced intergranular screening currents. In slowly swept AC magnetic fields the flux distribution dynamics was governed by a continuous relaxation of intergranular screening currents. The screening current density was logarithmically dependent on the sweep rate of the applied field.
引用
收藏
页码：1855 / 1858
页数：4
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