Flux motion during pulsed field magnetization in Y–Ba–Cu–O superconducting bulk magnet
- 1 December 1997
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 82 (11), 5600-5611
- https://doi.org/10.1063/1.366421
Abstract
We have studied the dynamical motion of magnetic-flux lines penetrating into a melt-processed Y–Ba–Cu–O bulk superconductor during pulsed field magnetization. Subsequent flux creep was investigated by measuring signals from three Hall sensors mounted at the center, periphery, and the midpoint on the top surface of the sample at 77 K. The penetration of the magnetic flux into the sample is quite sluggish as long as the applied field is low. However, the magnetic flux penetrates suddenly and moves rapidly in response to the changing external field during the ascending stage of the pulsed field, when the intensity exceeds 1.5–2 T. Furthermore, when the rise time of the pulsed field is very short, the local magnetizationmeasured at the midpoint is found to oscillate with time, as soon as the sudden penetration of the magnetic flux takes place. The fast motion of the magnetic flux generates heat and increases the temperature of the sample. This effect appears as a reduction of the trapped flux, already in the descending stage of the pulsed field and it contributes to the suppression of the flux creep after the pulse. The creep is suppressed more when the applied field is large, and it diminishes most in the center of the sample.Keywords
This publication has 20 references indexed in Scilit:
- Pulsed Field Magnetization of Melt-Processed Y–Ba–Cu–O Bulk Superconductor with No Weak LinksJapanese Journal of Applied Physics, 1996
- Numerical analysis of magnetization of a bulk high T/sub c/ superconductorIEEE Transactions on Magnetics, 1996
- High-Temperature Superconducting Motor Using Y-Ba-Cu-O Bulk MagnetsJapanese Journal of Applied Physics, 1995
- Magnetic Flux Distribution Induced by Pulsed Magnetic Field in Quench-and-Melt-Grown YBa 2Cu 3O 7-xJapanese Journal of Applied Physics, 1995
- Flux motion in quench-and-melt-grown YBa2Cu3O7 under pulsed magnetic fieldPhysica C: Superconductivity and its Applications, 1994
- Trains of Flux Jumps Observed in a Quench-and-Melt-Grown YBa2Cu3O7 under Pulsed Magnetic FieldJapanese Journal of Applied Physics, 1994
- Observation of Flux Movement in Quench-and-Melt-Grown YBCO Generated by a Pulsed Magnetic FieldJapanese Journal of Applied Physics, 1993
- Flux Creep Characteristics after High-Temperature Magnetization in YBaCuO SuperconductorJapanese Journal of Applied Physics, 1992
- Jc Measurements and the Observation of Flux Movements and Flux Jumps in Quench-and-Melt Growth YBCO by a Pulsed Magnetic FieldJapanese Journal of Applied Physics, 1991
- Magnetization of High-Field SuperconductorsReviews of Modern Physics, 1964