Flux motion during pulsed field magnetization in Y{endash}Ba{endash}Cu{endash}O superconducting bulk magnet

Journal Article · Mon Dec 01 04:00:00 EST 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.366421· OSTI ID:552963

Itoh, Y; Yanagi, Y ^[1]; Mizutani, U ^[2]

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1. IMRA Material RD Co., Ltd., Hachiken-cho, Kariya, Aichi 448 (Japan)
2. Department of Crystalline Materials Science, Nagoya University, Nagoya, Aichi 464-01 (Japan)

We have studied the dynamical motion of magnetic-flux lines penetrating into a melt-processed Y{endash}Ba{endash}Cu{endash}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{endash}2 T. Furthermore, when the rise time of the pulsed field is very short, the local magnetization measured 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. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 552963
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 11 Vol. 82; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM COMPOUNDS
BARIUM OXIDES
COPPER OXIDES
DYNAMICS
HIGH-TC SUPERCONDUCTORS
MAGNETIC FLUX
MAGNETIZATION
PENETRATION DEPTH
SUPERCONDUCTING MAGNETS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES